What is an annuity?

The plain definition

An annuity is not an investment fund, a savings account, or a stock. It is a contract with an insurance company. You are the owner, you name an annuitant (usually yourself) whose life the payments may be based on, and you name a beneficiary. The insurer takes on a risk that no bank or brokerage will take: the risk that you live a very long time and still need a cheque every month.

That is genuinely valuable — and it is why annuities exist at all. Social Security and a traditional pension are both annuities in economic terms: money paid for life, adjusted or not, backed by an institution rather than by your own portfolio balance. A commercial annuity lets you buy more of the same thing.

The difficulty is that "annuity" covers products as different as a three-year guaranteed-rate contract and a market-invested product with a dozen optional riders. Judging "annuities" as a category is close to meaningless. You have to judge the specific contract.

How an annuity works

Every annuity has the same four moving parts:

1. What you pay in (the premium). A single lump sum, or flexible payments over years.
2. How the value grows (the crediting method). A declared fixed rate, a formula tied to a market index, or the actual performance of investment subaccounts.
3. How money comes out (the payout). Withdrawals, a lump sum, or annuitisation into scheduled payments for a set period or for life.
4. What it costs. Explicit fees, or implicit costs in the form of caps, spreads and participation rates that keep part of the return.

The insurer's side is simpler than it looks. It takes your premium, invests it mostly in investment-grade bonds and mortgages, keeps a spread, and uses mortality pooling — some annuitants die earlier than average and subsidise those who live longer — to promise income for life that no individual could safely promise themselves.

Accumulation vs payout

Deferred annuities have two distinct phases, and confusing them causes most buyer regret.

During accumulation, your money grows inside the contract with taxes deferred. You still own an account value. You can usually withdraw a limited amount each year — often 10% — without penalty, and surrender the contract entirely for its cash value minus any surrender charge.

Once you annuitise, that changes completely. In exchange for scheduled payments, you typically give up the account value permanently. There is no balance to leave to heirs unless you bought a feature that provides one, and there is usually no way to reverse the decision. Immediate annuities skip accumulation and start here.

The main types

Fixed annuities

A declared interest rate for a stated term — the multi-year guaranteed annuity, or MYGA, is the common version and behaves much like a bank CD with different tax and liquidity rules. Principal is protected from market losses, the rate is known in advance, and the product is simple enough to compare on one number. See our fixed annuity guide.

Fixed index annuities

Interest is credited using a formula tied to an index such as the S&P 500, with a floor (usually 0%) so a bad market year credits nothing rather than a loss, and a ceiling in the form of a cap, participation rate or spread. You do not receive dividends and you are not invested in the index. See our fixed index annuity guide.

Immediate annuities (SPIA)

A lump sum converted straight into income, typically starting within a month or so and continuing for life. The most transparent annuity there is: you can compare insurers on the monthly payment alone. See our SPIA guide.

Deferred income annuities and QLACs

The same idea as a SPIA, but income starts years later — at 80, say — which buys far more income per dollar. A qualified longevity annuity contract is the version designed to sit inside retirement accounts under IRS rules.

Variable annuities

Your premium is invested in subaccounts resembling mutual funds. Returns are market returns, losses are possible, and fees stack up across the insurance charge, fund expenses and any riders. These are securities, sold with a prospectus and regulated by the SEC and FINRA as well as state insurance departments. See our variable annuity guide.

Registered index-linked annuities (RILA)

A middle ground: you accept a defined slice of market loss — a buffer or floor — in exchange for a higher cap than a fixed index annuity offers. Also a registered security.

Who issues them and who guarantees them

Annuities are issued by life insurance companies and regulated primarily at state level. There is no FDIC coverage. Every guarantee in the contract rests on the insurer's claims-paying ability, so the issuer's financial strength rating from AM Best, S&P or Moody's is part of the product, not a footnote.

If an insurer fails, your state's guaranty association provides a backstop. Coverage limits differ by state and commonly fall in the region of $250,000 of present value for annuity benefits — enough to matter, but a reason to check limits and consider splitting large amounts between insurers rather than to ignore issuer quality.

Costs, fees and surrender charges

• Surrender charges. A declining penalty for early exit, often starting near 7–10% and falling to zero over the surrender period. A market value adjustment can add to or subtract from that amount depending on interest rate moves.
• Mortality and expense risk charge. Typically 1%–1.4% a year on variable annuities.
• Subaccount fund expenses. Another 0.2%–1%+ a year in variable contracts.
• Rider fees. Guaranteed lifetime withdrawal benefits and enhanced death benefits commonly cost 0.5%–1.5% a year each.
• Implicit costs. In fixed index products the cap, spread and participation rate are the cost, and the insurer can usually reset them annually within contractual limits.
• Commissions. Paid by the insurer to the agent, commonly 1%–7% depending on the product. You do not see it as a line item, but it shapes what gets recommended to you.

How annuities are taxed

Money inside an annuity grows tax-deferred. That is useful, but it is not the same as tax-free, and it comes with trade-offs worth knowing before you buy:

• Gains withdrawn from a non-qualified annuity are taxed as ordinary income, not at long-term capital gains rates.
• Withdrawals come out gains first (last in, first out) until only your after-tax basis remains.
• Withdrawals before age 59½ can trigger a 10% additional tax on top of income tax, with limited exceptions.
• Annuitised payments use an exclusion ratio, so each payment is part untaxed return of basis and part taxable gain.
• Heirs do not receive a step-up in basis on annuity gains, unlike most taxable investments.
• An annuity held inside an IRA or 401(k) follows that account's rules — buying it for "tax deferral" inside an already tax-deferred account adds nothing on that front.

Pros and cons

Who annuities suit — and who they don't

An annuity tends to make sense when:

• You are approaching or in retirement and your essential expenses exceed Social Security and any pension.
• You value a predictable cheque more than the chance of a larger portfolio.
• You are placing money you genuinely will not need for the length of the surrender period.
• You have the health and family history to make lifetime income likely to pay off.

It tends to be a poor fit when:

• The money is, or might become, your emergency fund.
• You have not yet captured an employer 401(k) match or funded an IRA.
• Your priority is leaving the largest possible estate.
• You cannot explain, in your own words, how the product credits interest and what it costs.

How to buy one sensibly

1. Name the job first. Guaranteed rate on safe money, or income for life? Those are different products, and most bad purchases come from buying one while wanting the other.
2. Get at least three quotes from separately rated insurers. For income annuities the payment differences between carriers are large and easy to compare.
3. Check the rating. Prefer issuers rated A- or better by AM Best, and check your state guaranty limit before concentrating a large sum with one insurer.
4. Read the surrender schedule and any market value adjustment in the contract itself, not the brochure.
5. Ask how the agent is paid. A fee-only adviser with no commission stake can review the contract before you sign.
6. Use the free look period. Most states give you 10–30 days after delivery to cancel for a refund. It exists for a reason — use it to reread the contract calmly.