What Is an Annuity? (Types & How They Work)

What is an annuity? It is a contract with an insurance company that turns a sum of money into a stream of income, often income that lasts for the rest of your life. You hand the insurer a lump sum or a series of payments, and in return it promises to pay you back on an agreed schedule, either starting right away or years later after the money has grown. That promise is the whole point: an annuity is one of the few financial products designed specifically to guard against outliving your savings, which is why it shows up so often in retirement planning. It is an insurance product first and an investment second, and that distinction shapes everything about how it behaves.

This explainer lays out what an annuity is in plain terms: how the contract works, the two phases most annuities move through, the main types (fixed, variable, and indexed, plus immediate versus deferred), the real pros and the honest cons, the fees that deserve close attention, the riders you can bolt on, who an annuity tends to fit, who should be cautious, and how it compares with other sources of retirement income. Every payout rate, fee percentage, and dollar figure here is illustrative, chosen to show the shape of the decision rather than to quote a real product, because annuity terms vary enormously and change over time. If you want the accounts that build the savings an annuity later converts, our walkthrough on calculating your retirement number sets the target, and our explainer on what an HSA is covers a very different tax-advantaged account for health costs. Model the growth behind any lump sum with the calculator as you read. How annuities compare with the accounts themselves is mapped in our types of retirement accounts explainer.

What an annuity actually is

An annuity is a contract, and reading that word literally clears up most of the confusion around the product. You agree to give an insurance company money, and the insurer agrees to give it back to you as income under terms you both accept up front. Unlike a bank account or a brokerage account, where the balance is simply yours to manage, an annuity is a promise backed by the insurer’s ability to pay, governed by a contract that spells out exactly how and when the money comes back. That promise is the product you are buying, and its value is the certainty it provides.

The reason people buy that certainty is a risk that ordinary investments handle poorly: the risk of living longer than your money lasts. A portfolio can be drawn down too fast or hit by a bad market at the wrong moment, but a lifetime annuity keeps paying no matter how long you live or what markets do. In exchange for shifting that risk to the insurer, you generally give up some flexibility and pay for the guarantee through the rate or fees embedded in the contract. Keep in mind throughout that the payout rates, fees, and dollar amounts described here are illustrative and vary by insurer and contract, so confirm the actual terms before making any decision.

How an annuity works

The mechanics follow directly from the contract. You fund the annuity, either with a single lump sum or with contributions over time, and the insurer applies its terms to determine what you will receive. If it is an immediate annuity, the insurer starts sending payments almost right away, sized according to your lump sum, your age, and prevailing rates. If it is a deferred annuity, your money first grows inside the contract for a period of years, and only later converts into income. In both cases the insurer is doing the same core job: pooling many contracts together so that it can make reliable promises to each individual.

That pooling is why an annuity can pay in a way a solo saver cannot easily replicate. Because the insurer covers many people, some of whom will die earlier and some later than average, it can promise lifetime income to everyone without having to assume every person lives to an extreme old age. The benefit that flows from this pooling is sometimes called a mortality credit, and it is part of what makes lifetime income possible. On an illustrative $200,000 premium at a 5.5 percent payout rate, that structure produces roughly $11,000 of income a year, about $917 a month. Those figures are illustrative and depend entirely on the specific contract, your age, and current rates, so treat them as a shape, not a quote.

The accumulation phase and the payout phase

Most deferred annuities move through two clearly separated stages, and understanding the boundary between them is essential. The first is the accumulation phase, during which your money sits in the contract and grows. Depending on the type, that growth is a fixed rate, a return tied to investments you select, or interest credited from a market index. A defining tax feature of this phase is that the growth is generally tax-deferred, so you owe no yearly tax on gains as they accrue, which lets the balance compound without the annual drag a taxable account would face.

The second stage is the payout phase, sometimes called annuitization, when the accumulated balance is converted into a stream of income. You choose the shape of that income: payments for a set number of years, payments for your lifetime, or a joint arrangement that continues for a spouse. On an illustrative $200,000 balance, a payout in the range used here produces roughly $11,000 a year. The critical thing to grasp is that the move from accumulation to payout is usually permanent. Once you annuitize, you typically cannot reverse the decision and reclaim the lump sum, which is why the choice of when and how to annuitize deserves as much attention as the choice to buy in the first place.

The main types of annuities

Annuities are easiest to sort along two independent questions, and almost every product is just a combination of one answer to each. The first question is how the money grows or is credited, which gives you fixed, variable, and indexed annuities. The second question is when income begins, which gives you immediate versus deferred annuities. A single contract picks one from each list, so you might buy a deferred fixed annuity that grows at a set rate and pays later, or an immediate income annuity that skips growth and pays now.

Because the labels combine, the shelf of products can look more crowded than it really is. Strip away the marketing names and you are choosing a growth mechanism and a timing, then layering optional riders on top. The growth choice controls how much market risk you take and how much your income might vary, while the timing choice controls whether you are solving for income today or income at a future date. On an illustrative $200,000 premium, the income any of these ultimately produces might be around $917 a month, but the path to that income, and the risk along the way, differs sharply by type. The sections below take each growth type in turn, then the timing distinction.

Fixed annuities

A fixed annuity is the simplest of the three growth types. The insurer credits a set interest rate on your money for a stated period, much like a certificate of deposit, and it guarantees both the rate and, ultimately, the income the balance can produce. Because the return is defined in advance, there is no market risk to your principal during the guarantee period, which is exactly what appeals to people who want predictability above all. The trade-off is that the guaranteed rate is typically modest, so a fixed annuity prioritizes certainty over growth.

Fixed annuities are often the easiest to compare, because a stated rate is a stated rate, and they usually carry low or no explicit annual fee, since the insurer’s costs are built into the rate it offers. That relative transparency is a real virtue in a product category known for complexity. The caution is that the attractive introductory rate on some contracts can reset lower after an initial period, and surrender charges can still lock your money in for years. A fixed annuity suits a saver who wants a bond-like, principal-protected place to hold retirement money and eventually convert it to steady income, without the moving parts of the variable and indexed versions. As always, the specific rate and terms are illustrative here and vary by contract.

Variable annuities

A variable annuity ties your returns to investments you choose from a menu of subaccounts, which function much like mutual funds holding stocks and bonds. Your balance rises and falls with those investments, so the upside is greater than a fixed annuity’s, and so is the risk to your principal. Variable annuities are the most flexible on growth and the most complex on cost, which is the central tension of the product. They are often paired with optional riders that add income or death-benefit guarantees on top of the market exposure, each for an extra fee.

The reason variable annuities draw the most scrutiny is their layered fees. A typical contract can stack an administrative or mortality-and-expense charge, the expenses of the underlying subaccounts, and the cost of any riders, which together are commonly cited in the range of two to three percent or more per year. On a large balance, that annual drag compounds into a substantial sum over decades, an effect our walkthrough on the power of compound interest makes vivid in the opposite direction. A variable annuity can make sense for someone who specifically wants market participation inside a tax-deferred insurance wrapper with income guarantees, but the fees demand a hard look. Ask for every charge in writing before buying, because the headline number rarely captures the full cost.

Indexed annuities

An indexed annuity, sometimes called a fixed indexed annuity, sits between the fixed and variable types. It credits interest linked to the performance of a market index, but with two features that reshape the outcome: a cap that limits how much of the index’s gain you receive, and a floor, often zero, that protects you from index losses. The pitch is upside participation with downside protection, and for the right person that balance is appealing. The reality is that the caps, participation rates, and spreads can quietly limit returns in ways that are hard to see from the headline description.

The complexity is the main caution with indexed annuities. Because the crediting method involves caps, participation rates, and sometimes multiple index options, two contracts that sound similar can perform very differently, and the fine print determines the outcome. The explicit annual fee may look modest, but the real cost hides in how much of the index’s gain the cap and participation rate hold back. Indexed annuities can fit a saver who wants more growth potential than a fixed annuity offers without the full market risk of a variable one, provided they understand the crediting mechanics. Because those mechanics vary so widely and the illustrative figures here cannot capture any specific product, read the crediting method closely and consider professional help interpreting it.

Immediate vs deferred annuities

The second question, when income begins, produces the immediate-versus-deferred distinction, and it is just as important as the growth type. An immediate annuity, often bought with a single premium, starts paying income almost right away, typically within a year of purchase. You give the insurer a lump sum and it begins sending you payments, which makes an immediate annuity a tool for someone who is at or near retirement and wants to convert savings into income now. There is little or no accumulation phase, so the decision is mostly about the payout terms and the rate on offer.

A deferred annuity, by contrast, is bought with income starting at a future date, sometimes many years out. The money grows during the accumulation phase first, then converts to income later, which makes a deferred annuity a tool for someone still building toward retirement or wanting to schedule income to begin at a chosen age. A particular variant, sometimes structured to start payments late in life, is designed specifically to insure against outliving your money at advanced ages. On an illustrative $200,000 premium, both structures can eventually pay around $917 a month, but the immediate version pays now while the deferred version pays later after growth. Which timing fits depends entirely on when you actually need the income.

The pros of an annuity

The strongest argument for an annuity is guaranteed income you cannot outlive. A lifetime annuity keeps paying regardless of how long you live or what markets do, which addresses a genuine fear that ordinary investments handle poorly. For a retiree who wants to know that essential expenses are covered no matter what, that certainty has real psychological and financial value, and it is difficult to reproduce with a self-managed portfolio. On an illustrative $200,000 premium the income might be around $11,000 a year, and over a long retirement that stream can total roughly $275,000, a figure that shows why lifetime income appeals to people worried about longevity.

The second real advantage is tax-deferred growth during the accumulation phase. Money inside a deferred annuity grows without the yearly tax on interest, dividends, and gains that a taxable account incurs, so the balance can compound faster along the way. For someone who has already maxed out other tax-advantaged accounts, this extra tax-deferred space can be useful. A third benefit is the option to add guarantees through riders, tailoring the contract to a specific worry like leaving money to heirs. These upsides are genuine, but they always come bundled with costs, so the honest way to weigh an annuity is to hold the guarantees and the fees in view at the same time.

The cons of an annuity

The honest downsides deserve equal billing, because they are the reason annuities are so often criticized. The first is cost. Many annuities, especially variable and indexed ones, carry layered fees that can meaningfully reduce returns each year, and on an illustrative balance those charges can compound into a large sum over decades, perhaps $75,000 across a long horizon in the illustrative case used here. The second is illiquidity. Surrender charges lock your money in for a period, and once you annuitize, the lump sum is generally gone, so an annuity is poorly suited to money you might need on short notice.

The third downside is complexity. Annuity contracts can be dense, with caps, participation rates, riders, and surrender schedules that make products genuinely hard to compare, which creates room to be sold features you do not need. The fourth is opportunity cost: the money committed to an annuity is not available to grow in a low-cost portfolio, and for a purely growth-focused goal that portfolio often wins over long periods. None of this makes annuities inherently bad, but it does mean they reward slow, careful reading and punish impulse purchases. The right posture is skepticism toward complexity and a demand that every guarantee justify its fee.

Annuity fees to watch

Because fees are the single biggest determinant of whether an annuity is a good deal, it helps to know the specific charges to look for. Mortality-and-expense charges cover the insurer’s guarantees and administration and are common on variable annuities. Administrative fees cover recordkeeping. Underlying investment expenses apply to the subaccounts in a variable annuity and can be significant on their own. Rider fees are charged for each optional guarantee you add. Surrender charges apply if you withdraw more than the allowed amount during the surrender period. Any one of these can look small in isolation while adding up to a meaningful annual total.

The practical move is to demand a written breakdown of every charge before buying, then add them up into a single all-in annual percentage. On an illustrative $200,000 balance, even a fee that sounds modest translates into real dollars: a 1.5 percent annual charge is about $3,000 in the first year alone, and over a long horizon the cumulative cost can reach roughly $75,000 in the illustrative case here. Those figures are illustrative and depend on the actual contract, but the exercise of converting percentages into dollars is exactly what reveals whether the guarantees are worth their price. If a salesperson cannot or will not itemize the costs clearly, treat that as a warning in itself.

Illustrative annual cost by annuity type

Fees vary sharply by type, and seeing the illustrative ranges side by side clarifies why the type you choose matters as much as the insurer. The chart below shows illustrative all-in annual costs, from the typically low charges on a fixed or immediate annuity to the layered costs common on a variable contract with riders. These are illustrative ranges meant to show relative scale, not any real product’s price.

Read the chart as a statement about relative scale, not precision. The pattern is that simpler, more guaranteed products tend to carry lower explicit fees, while products offering market participation and layered guarantees carry higher ones, because you are paying for both the investment management and the guarantees. A low explicit fee is not automatically better, since an indexed annuity’s caps can hold back returns in ways a fee number does not show, and a fixed annuity’s low fee comes with a modest rate. The honest comparison converts every cost into dollars on your own balance, which is exactly what the calculator helps you visualize over time. Confirm the real all-in cost of any contract before relying on these illustrative figures.

Surrender charges and liquidity

Surrender charges are worth their own section because they catch many buyers by surprise. When you buy a deferred annuity, the contract typically imposes a surrender period, often several years, during which withdrawing more than a small allowed amount triggers a charge. That charge is usually a percentage of the amount withdrawn, and it commonly starts high in the first year and declines each year until it reaches zero when the surrender period ends. The purpose is to let the insurer recover its upfront costs, but the effect on you is that the money is locked in far more tightly than in a regular account.

Most contracts do allow a limited penalty-free withdrawal each year, often a modest percentage of the balance, which provides some access without triggering the charge. Beyond that, though, an annuity should be treated as long-term money you will not need on short notice. On an illustrative $200,000 balance, an annual fee of $3,000 is one cost, but a surrender charge on an early exit can dwarf it. If there is any real chance you will need the principal back during the surrender period, that is a strong signal an annuity may be the wrong vehicle, or at least that you should not commit money you cannot afford to lock away. Read the surrender schedule before anything else in the contract.

Where a lifetime annuity payment comes from

It helps to see what actually funds a lifetime annuity payment, because it demystifies how the insurer can promise income for life. Each payment you receive is a blend of three sources: a return of part of your own premium, the investment earnings the insurer generates on the pool, and the mortality or pooling credit that comes from spreading longevity risk across many contract holders. The illustrative split below shows how one lifetime payment might break down. The shares are illustrative and sum to 100.

The reason this breakdown matters is that it explains both the appeal and the limits of an annuity. Because a large share of early payments is simply your own premium coming back, an annuity is not magic, and if you die early you may receive less than you paid in unless a refund feature is attached. On an illustrative $200,000 premium, it takes roughly 18 years of payments just to recover the premium, after which the pooling credit and earnings carry the income, which over a long life can total around $275,000. That is precisely why an annuity rewards longevity: the longer you live, the more the pooling credit works in your favor. The shares here are illustrative and depend on age, rates, and the specific contract.

Annuity riders explained

Riders are the optional add-ons that let you tailor an annuity to a specific worry, and each one carries its own fee. A guaranteed lifetime withdrawal benefit is among the most common: it lets you take a defined income for life while keeping some access to the remaining balance, which appeals to people who want income guarantees without fully surrendering the lump sum through annuitization. A death-benefit rider ensures that a value passes to your heirs if you die before receiving a certain amount, addressing the fear of losing the premium to an early death. Other riders enhance benefits for long-term-care needs or step up the value under certain conditions.

The honest framing is that riders can be genuinely useful or an expensive way to buy peace of mind you do not need, and the difference lies in whether the rider addresses a real risk in your situation. Each rider adds an annual fee, and several stacked together can push the all-in cost toward the high end of the range shown earlier. Some riders are also marketed harder than they are needed, so the discipline is to price each one separately: what does this specific guarantee cost per year, and what specific risk does it remove. If the risk is not one you actually face, the rider is just cost. Weigh each rider on its own merits rather than assuming more guarantees are always better.

How much does an annuity pay each month?

The question that follows what is an annuity is almost always how much one pays, and the honest answer has three moving parts: the premium you hand over, the payout rate the insurer offers, and the shape of income you choose. Holding the illustrative 5.5 percent payout rate used throughout this explainer constant, the arithmetic scales in a straight line with the premium. A $100,000 premium produces roughly $5,500 a year, about $458 a month. A $200,000 premium produces roughly $11,000 a year, about $917 a month. A $500,000 premium produces roughly $27,500 a year, about $2,292 a month. Those figures exist to show the shape of the relationship, not to quote any real contract.

The payout rate itself is the part that varies most, and it moves with several things at once. Age is the largest single factor on a lifetime annuity, because a shorter expected payout period lets the insurer offer a higher rate on the same premium, which is why the same money buys noticeably more monthly income at an older age than a younger one. Prevailing interest rates matter, since the insurer is investing the pool. The income shape matters too: a single-life annuity pays more than a joint-life one covering two people, and adding a period-certain or refund feature that protects heirs lowers the monthly payment, because the guarantee has to be paid for out of the same premium.

That trade is the one to hold onto. Every protection you add, a spouse, a minimum number of payments, an inflation adjustment, is bought with monthly income, and a higher quoted payment often means fewer guarantees rather than a better deal. When comparing quotes, hold the income shape identical across insurers and only then compare the monthly figure, or you are comparing different products. Model how a lump sum grows before it ever becomes income with the calculator, and treat every payout rate here as illustrative rather than a rate any insurer is currently offering.

Is an annuity a good investment, or is it insurance?

Much of the argument about annuities comes from judging them on the wrong scale. An annuity is an insurance product first, and the thing it insures is longevity, the risk of living longer than your money lasts. Judged as an investment against a low-cost portfolio over a long horizon, most annuities look poor, because the fees, caps, and guarantees all cost return. Judged as insurance against a risk that no portfolio handles well, a lifetime annuity does something a portfolio genuinely cannot: it keeps paying at age 95 regardless of what the market did at 75.

The useful comparison is therefore not annuity versus index fund but annuity versus the alternative way of covering the same risk, which is holding a larger, more conservative portfolio and drawing it down cautiously. Self-insuring longevity means keeping a bigger cushion and spending less than you might otherwise, because you have to plan for the possibility of a very long life. Handing that risk to an insurer lets a smaller sum cover the same essential spending, and the difference is roughly what you are paying for.

Two honest caveats belong with that framing. The first is that the guarantee is only worth its price when it is actually solving a problem you have; if Social Security and a pension already cover your essential expenses, the risk is largely insured already and an annuity may be buying something you own. The second is that the fee level decides whether the insurance is fairly priced, which is why the simple products with low explicit costs draw far less criticism than the layered ones. This explainer takes no position on whether any reader should buy an annuity, and a fee-only advisor who does not earn a commission is the right person to test the case against your actual numbers.

Are annuities safe, and what backs the guarantee?

Because an annuity is a promise rather than an account balance, safety means something specific: it depends on the insurer’s continued ability to pay. There is no federal deposit insurance behind an annuity the way there is behind a bank account. What stands behind the contract is the insurer’s own financial strength, its reserves, and the regulatory regime that supervises it, which is why the company’s ratings from independent rating agencies are worth checking before signing, and why some buyers deliberately split a large premium across more than one insurer rather than concentrating the promise in a single company.

There is a second layer in the United States, the state guaranty association system, which provides a level of protection to policyholders if an insurer fails. The important detail is that the coverage limits and the exact terms are set state by state and change over time, so the amount protected in one state is not necessarily the amount protected in another. Confirm your own state’s current limits with the relevant association or your state insurance regulator rather than assuming a figure, and do not treat that backstop as a reason to skip the diligence on the insurer itself.

Safety also has a second meaning that has nothing to do with insolvency: the risk that the contract does not do what you expected. A surrender schedule that locks money away longer than you can afford, a cap that quietly limits crediting, or a rider whose guarantee applies to a benefit base rather than the cash you can withdraw are all ways a perfectly solvent insurer can leave a buyer disappointed. Reading the contract, converting every fee into dollars, and asking what happens if you need the money early are the parts of safety you control. As with everything in this explainer, these are general descriptions rather than advice about any specific insurer or contract.

Who an annuity is for

An annuity tends to fit a specific profile rather than everyone. The clearest fit is someone at or near retirement who is worried about outliving their savings and wants a portion of their income guaranteed for life. For this person, converting some savings into a lifetime income annuity can cover essential expenses, rent or a mortgage, utilities, food, so that those are secure regardless of market swings or how long they live. That security lets the rest of the portfolio stay invested for growth without the pressure of funding the basics, which is a genuinely useful division of labor.

An annuity can also fit someone who has already maxed out other tax-advantaged accounts and wants additional tax-deferred space, or someone who knows they will spend down a portfolio poorly under stress and would rather hand that discipline to an insurer. People who value certainty over the last dollar of return, and who can commit money for the long term without needing it back, are the natural buyers. On an illustrative $200,000 premium, the roughly $11,000 of annual income such a person locks in is the point of the purchase. If this describes your situation, an annuity is worth exploring, ideally with a fee-only advisor who does not earn a commission on the sale.

Who should be cautious about annuities

Just as clearly, an annuity is a poor fit for many people, and recognizing that upfront saves money and regret. Anyone whose main goal is maximizing growth over a long horizon will usually do better in a low-cost portfolio, because the fees and caps on annuities work against pure accumulation. Younger savers who are decades from retirement rarely need the longevity insurance an annuity provides and are better served filling tax-advantaged accounts first, a sequence our explainer on IRA vs 401(k) lays out. Someone who might need the principal back on short notice should avoid tying it up behind surrender charges.

Caution is also warranted whenever a product is complex and aggressively sold. High-commission variable and indexed annuities are sometimes pushed on people who do not need them, and the layered fees can quietly erode returns for years. If you cannot get a clear, itemized breakdown of every cost, or if the pitch leans on fear rather than a specific need you actually have, step back. On an illustrative balance, fees of $75,000 over a long horizon are real money that a simpler plan would keep. Being cautious does not mean never buying an annuity; it means demanding clarity, matching the product to a real need, and refusing to be rushed into a contract you do not fully understand.

Annuity vs other retirement income

An annuity is one of several ways to generate retirement income, and it helps to see where it fits among the alternatives. Social Security is itself a form of inflation-adjusted lifetime annuity provided by the government, and for most people it is the foundation of guaranteed income, which is why delaying it to increase the benefit is often more valuable than buying a private annuity. A portfolio of stocks and bonds drawn down using a sustainable withdrawal approach offers growth and flexibility but no guarantee against a bad sequence of returns. Bonds and CDs provide safety but not lifetime guarantees.

An annuity’s distinct role is to guarantee income you cannot outlive, filling the gap between your guaranteed sources like Social Security and your essential expenses. The common framework is to cover essential spending with guaranteed income, from Social Security first and an annuity if there is still a gap, then invest the rest for growth and flexibility. On an illustrative $200,000 premium, the roughly $11,000 an annuity adds to that guaranteed layer might be worth the fees, which could total $75,000 over time, if it lets the rest of the portfolio stay invested with less anxiety. Our walkthrough on how to retire at 65 puts these income sources together into a target. The right mix depends on your other guaranteed income, your health, and your comfort with market risk.

A side-by-side comparison of annuity types

It helps to see the main annuity types lined up on how they work and who they tend to suit. The table below summarizes the general characteristics discussed above. Every entry is a broad characterization, and the specific rates, caps, fees, and terms are illustrative and vary by insurer and contract, so confirm the current details before relying on any single row.

Reading across the rows, the pattern is that the fixed and immediate types prioritize certainty and simplicity, the variable type offers the most growth and the most cost, the indexed type splits the difference with mechanics that need careful reading, and the deferred structure is about timing rather than growth. No single type dominates, because the right choice depends on whether you want income now or later and how much market exposure you can tolerate. Use the table as a quick reference, but confirm the specific terms, especially the fees and any caps, before relying on any row.

How annuities are taxed

The tax treatment of an annuity depends on how it was funded, and getting this right matters for the after-tax value. An annuity bought with after-tax dollars, sometimes called a non-qualified annuity, grows tax-deferred, and when payments begin only the earnings portion is taxed as ordinary income, while the return of your original premium comes back tax-free. An annuity held inside a tax-advantaged retirement account, sometimes called a qualified annuity, follows that account’s rules instead, so withdrawals are generally taxed as ordinary income in full. The distinction changes how much of each payment you actually keep.

A few tax features recur across annuities. Growth is generally tax-deferred until withdrawal, which is one of the product’s genuine advantages. Withdrawals of gains before a certain age can trigger an additional tax penalty on top of ordinary income tax, similar to other retirement accounts. And annuities held in retirement accounts can be subject to required minimum distributions once you reach a certain age. Every one of these rules is set by tax authorities and changes over time, so the specifics here are general principles rather than current figures. Before assuming any particular tax outcome, confirm the current rules for your situation and consider a tax professional, because the after-tax value is what ultimately matters.

A worked example: one retiree’s annuity

Make it concrete with an illustrative retiree named Priya. At retirement she has built a portfolio and, after covering part of her essential expenses with Social Security, finds a remaining gap she wants guaranteed. She decides to convert an illustrative $200,000 into an immediate lifetime annuity. At an illustrative 5.5 percent payout rate, that produces roughly $11,000 a year, about $917 a month, which she uses to cover the gap between Social Security and her fixed monthly bills. The rest of her savings stays invested for growth and flexibility.

Because a large share of her early payments is simply her own premium coming back, it takes several years before she has recovered the $200,000, but if she lives a long life the pooling credit and earnings mean the annuity keeps paying well beyond that point, potentially totaling around $275,000 over a long retirement. Priya is not trying to beat the market with this money; she is buying certainty for the part of her budget she refuses to leave to chance. The figures here are illustrative and depend on her age, current rates, and the specific contract, so she confirms the actual terms and reviews the decision with a fee-only advisor. Our walkthrough on calculating your retirement number helped her size the gap the annuity fills.

How to evaluate an annuity before buying

If you are considering an annuity, a short discipline separates a sound purchase from an expensive mistake. Start with the need: name the specific risk you are trying to insure, usually outliving your income, and confirm an annuity is the right tool for it rather than a product being sold to you. Then get every cost in writing and add it into a single all-in annual percentage, including riders, so you can compare contracts on the same basis. Check the surrender schedule and confirm you can commit the money for the full period without needing it back.

Next, examine the guarantees closely. For an indexed annuity, understand the caps and participation rates, not just the headline. For a variable annuity, add up the layered fees honestly. For any lifetime annuity, look at whether a refund or period-certain feature protects against an early death and how much income that protection costs. Finally, consider the insurer’s financial strength, since the guarantee is only as good as the company behind it, and get independent advice from someone who does not earn a commission on the sale. Because the stakes and the fees are both large, this is a decision worth slowing down for, and there is no penalty for walking away from a contract you do not fully understand.

Using a calculator with an annuity decision

A calculator turns the annuity question into your own numbers, and it is worth knowing what it can and cannot do. What it does well is show how a lump sum grows before you annuitize and how an income stream accumulates over the years, so you can compare the guaranteed income of an annuity against what a self-managed drawdown might produce. Enter a premium, an assumed payout rate, and a horizon, and you can see roughly $11,000 of annual income and how many years, around 18 in the illustrative case, it takes to recover the premium. The calculator on this page runs the underlying compound-growth math for the accumulation side.

What no calculator can do is tell you the exact terms of a real contract, since those depend on the insurer, current rates, your age, and the specific riders and caps involved. Those inputs come from the actual contract, ideally reviewed with a fee-only advisor. Treat any figure a calculator produces as illustrative, vary the assumptions to see how sensitive the result is, and confirm real terms before relying on them. Our explainer on what an HSA is covers a very different account for a very different need, health costs rather than lifetime income, and the calculator shows how any lump sum compounds before it becomes income.

The bottom line

An annuity is a contract with an insurer that turns savings into income, most valuably income you cannot outlive, which makes it insurance against longevity rather than a bet on growth. Its main types are simple once you separate them: fixed, variable, or indexed for how the money grows, and immediate or deferred for when income starts, with riders layered on for specific guarantees. The upsides, guaranteed lifetime income and tax-deferred growth, are real, and so are the downsides, fees, surrender charges, complexity, and illiquidity, which vary enormously by contract. On illustrative figures, an annuity might pay around $917 a month while costing $75,000 in fees over a long horizon, and only you can judge whether that trade is worth it. Treat every rate, fee, and dollar figure here as a teaching illustration rather than a real quote, match any purchase to a specific need, demand every cost in writing, and bring the decision to a qualified, fee-only fiduciary advisor. Put your own numbers into the calculator and see how the lump sum behaves before it becomes income.

This explainer is educational only and is not financial, tax, investment, insurance, or legal advice. Annuities are complex insurance contracts whose payout rates, crediting methods, caps, participation rates, fees, surrender schedules, rider costs, and tax treatment vary enormously by insurer, product, and the year you buy, and many of those terms are set by contract or by tax authorities and change over time, so read every payout rate, fee percentage, and dollar figure here as an illustration meant to show the structure of the decision, never as a current quote or a forecast of any real product. The $200,000 premium, the 5.5 percent payout rate, the roughly 0.5 through 3.0 percent illustrative fee ranges, the 55, 30, and 15 percent payment-source split, and the income and break-even figures used in the charts, the worked example, and the interactive companion are simplified for teaching and assume steady figures that real contracts and real markets will not deliver exactly. An annuity’s guarantees are only as strong as the insurer behind them, and committing money to one usually means locking it away, so an annuity that fits one person’s longevity fear may be wrong for another person’s need for growth or liquidity. Before buying any annuity, choosing among fixed, variable, indexed, immediate, or deferred structures, adding riders, or converting savings into lifetime income, confirm the actual contract terms and the current tax rules, compare the all-in costs in writing, and consult a qualified professional, such as a fee-only fiduciary advisor who earns no commission on the sale, for guidance built around your own circumstances.