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Annuity & insurance-based income

Fixed-Index Annuities

Your principal is never credited a negative index return, and in exchange the insurer keeps everything above the cap, participation rate or spread written into the contract.

A fixed-index annuity is a deferred fixed annuity whose interest is linked to an external index such as the S&P 500 rather than to a declared rate. Each crediting period the index change is measured and converted into interest using a cap, a participation rate or a spread, with a floor of zero so a falling index credits nothing rather than a loss. It is not an investment in the index: the money stays in the insurer's general account, index dividends are not received, and the caps and participation rates are re-declared by the insurer each period within contractual minimums.

Interest from lending Truly passive

The labels above place this income type before you read a word. The first is the mechanism — how the money actually reaches you, whether by lending it out, owning a slice of something, renting an asset, licensing a right, selling an option or owning a business somebody else runs. The second says whether the income keeps arriving on its own once it is running, or whether it needs work from you to keep coming. Both are descriptions of how the thing is built, not verdicts on it.

Category caveat
Fees, surrender charges, liquidity limits, insurer credit quality and tax treatment all matter, and they are easy to miss in an illustration.

How it works

Premium paid into a fixed-index annuity goes into the insurer's general account. The insurer sets aside enough in bonds to guarantee return of principal at the end of each crediting period, then spends whatever budget is left over on index options. Those options are what fund the interest eventually credited to the contract; the index itself is never purchased or held.

Crediting methods differ in ways that change outcomes substantially even for the same index. Annual point-to-point compares the index value on two anniversaries and ignores everything in between. Monthly sum adds up capped monthly percentage changes but lets negative months subtract in full. Monthly average smooths the year by averaging index values across twelve months. Multi-year point-to-point stretches the comparison across two or more years. Three devices then convert the measured move into credited interest: a cap on the maximum credit, a participation rate applied to a percentage of the move, and a spread or margin subtracted before crediting; many contracts layer more than one of these together. Index measurement is almost always price return, so dividends paid by the underlying constituents are excluded before any cap or participation rate is applied.

The zero floor protects against a negative index credit only. It does not stop the account value from declining through rider charges, index fees, or withdrawals taken during the year. Volatility-controlled and proprietary indices, common in current contract designs, target a fixed volatility band and often carry an explicit index fee; that fee is part of what allows a headline participation rate to be advertised above 100 percent.

Most contracts also offer a plain fixed-rate bucket alongside the index-linked options, and allocations across buckets can typically be changed at each contract anniversary. An optional guaranteed lifetime withdrawal benefit rider, added for an annual fee, grants a right to withdraw a stated percentage for life, calculated against a benefit base rather than the account value itself. Surrender schedules run long by industry norms, commonly seven to ten years or more, and are usually paired with a market value adjustment on amounts taken above the free-withdrawal allowance.

What it pays

Income comes out one of three ways: free withdrawals against the account value, lifetime withdrawals under a rider, or annuitization of the contract into a fixed payment stream. In every case the interest credited during accumulation is a function of three things acting together: the path the index actually took, the crediting method the contract uses to measure that path, and the cap, participation rate, or spread declared for that particular period.

Those declared terms are not fixed for the life of the contract. They come from the insurer's option budget, which is funded by the yield on its bond portfolio and the prevailing cost of hedging; when bond yields fall or options become more expensive, caps generally tighten. Each new crediting period the insurer redeclares its terms, and it can lower them down to whatever floor the contract specifies as its guaranteed minimum.

Under a lifetime withdrawal rider, the payout is quoted as a percentage of a benefit base, with the percentage typically stepping up by age band depending on when withdrawals begin. A roll-up rate applied to that benefit base is not a return: it is an input to a withdrawal formula, it cannot be cashed out, and in most contracts it is not what a beneficiary collects at death. Because index dividends are excluded from every crediting method and gains are constrained by a cap or participation rate, the interest actually credited in a strong market year is structurally lower than the total return of the index being tracked.

Costs and taxes

The largest cost in a fixed-index annuity rarely shows up as a line-item fee. It is the upside given up through the cap, participation rate, or spread, which is precisely how the insurer funds the promise never to credit a negative index return. Where explicit charges do exist, they take the form of an annual rider charge deducted from the account value, an index fee on volatility-controlled designs, and occasionally a flat annual contract fee.

Premium bonuses, offered by some contracts to make the initial deposit look larger, are recovered elsewhere: through lower caps, a longer surrender schedule, or vesting rules that only credit the bonus in full if the contract is held to term or annuitized.

Tax treatment follows the standard deferred-annuity rules under US law. Growth compounds tax-deferred, non-qualified withdrawals are treated as earnings first and taxed as ordinary income, and a 10 percent additional federal tax generally applies to withdrawals taken before age 59 and a half. Index-linked gains are taxed as ordinary income on withdrawal, never as long-term capital gain, regardless of the equity index referenced. There is no step-up in basis at death; a beneficiary receives the gain as income in respect of a decedent. Holding a fixed-index annuity inside an IRA adds no incremental tax deferral, since the IRA already provides it, so the fees paid there buy only the guarantee and rider features. State premium tax applies in states that levy one.

Liquidity and time commitment

Surrender schedules of seven to ten years or longer are standard, with an annual free-withdrawal percentage set by contract and a market value adjustment applied to anything taken beyond it during the surrender period. Withdrawals above the free amount, or above what a rider permits, can trigger surrender charges and reduce the benefit base by more than a proportional amount rather than dollar for dollar.

Once lifetime rider income has started, the permitted withdrawal amount is generally fixed. Taking an additional lump sum on top of scheduled rider income can permanently impair the guarantee the owner has been paying for. Interest credits themselves are only applied at the end of each crediting period, so a full or partial surrender in the middle of a period commonly forfeits any credit that would otherwise have accrued.

The standard death benefit paid to a beneficiary is the account value. Some contracts will pay a larger, benefit-base-related amount, but only if the beneficiary agrees to take it spread over several years rather than as a lump sum. Beyond the initial purchase decision, ongoing effort is limited to an allocation choice among buckets at each contract anniversary and reading the notice that discloses renewed caps and participation rates.

How it goes wrong

Sales illustrations sometimes back-test a proprietary index across years in which the index never actually traded, producing hypothetical credited returns that the live index has not since reproduced. A related and common misunderstanding is treating the rider's benefit base as spendable money; the owner later discovers a surrender value far below the benefit base and, in many contracts, a death benefit based on the smaller number.

First-year caps or participation rates are sometimes set generously and cut sharply at the first renewal, so an attractive headline term functioned as a temporary teaser rather than a durable feature. A seven-to-ten-year surrender schedule can also collide with a health, housing, or family need that arrives on its own timetable, forcing a withdrawal into surrender charges and a market value adjustment.

Crediting mechanics create their own failure modes. Annual point-to-point crediting can produce a zero credit in a year the index was up strongly for eleven months but finished slightly negative on the measurement date, because only two anniversary values matter. Monthly-sum designs can credit almost nothing after a single sharp down month, since down months enter the sum uncapped while up months remain capped.

Rider charges and index fees continue to deduct from the account value even in flat or zero-credit years, so the zero floor on index losses does not prevent the account value from shrinking overall. A 1035 exchange moving the contract into a new fixed-index annuity restarts the surrender schedule from year one and generates a new commission, often without a corresponding improvement in terms.

What to remember

  • Principal is never credited a negative index return, but the insurer keeps everything above the cap, participation rate, or spread it declares each period, and those terms can be cut at renewal down to a contractual minimum.
  • Index measurement excludes dividends and is filtered through a cap, participation rate, or spread, so credited interest in a strong year is structurally lower than the index's own total return.
  • A benefit base tied to a lifetime withdrawal rider is a calculation device for future withdrawals, not cash value; it cannot be surrendered and often is not paid at death.
  • Surrender schedules commonly run seven to ten years or more with a market value adjustment attached, making this a poor fit for money that might be needed on short notice.
  • All withdrawals of gain are taxed as ordinary income under deferred-annuity rules, never as capital gains, and a 10 percent additional tax generally applies before age 59 and a half.
  • Placing a fixed-index annuity inside an IRA adds no extra tax deferral, since the IRA already defers taxes, leaving the fees to pay only for the guarantee and rider features.

Frequently asked

What is a fixed-index annuity?
It is a fixed deferred annuity whose interest is linked to an index rather than declared as a rate. Each period the index move is converted into interest using a cap, participation rate or spread, with a floor of zero in down periods. The money never leaves the insurer's general account, so the owner is not invested in the index.
Does a fixed-index annuity earn the index return?
No. The credit is limited by a cap, participation rate or spread, and the calculation almost always uses price return, which excludes the dividends paid by the index constituents. Those limits are how the insurer funds the guarantee that a down period credits zero rather than a loss.
What is a benefit base?
A benefit base is a bookkeeping figure used to calculate income under a guaranteed lifetime withdrawal rider. It may grow at a contractual roll-up rate, but it is not cash: it cannot be surrendered, and in most contracts it is not what a beneficiary receives. The account value is the real money, and rider charges are deducted from it.
Can I lose money in a fixed-index annuity?
The index floor prevents a negative index credit, but the account value can still decline through rider charges and index fees in periods that credit nothing. Surrendering during the surrender period can also return less than was deposited, once the surrender charge and any market value adjustment are applied.
How is the income taxed in the US?
Like any deferred annuity. Interest compounds tax-deferred, and withdrawals from a non-qualified contract come out earnings-first as ordinary income, with a 10% additional federal tax generally applying before age 59 and a half. Index-linked gains never receive capital gains treatment.

Written for information only. Nothing here is investment, tax or legal advice, and no page on this site recommends buying or selling anything. Rules and tax treatment change; verify anything that matters with a professional who knows your situation. This explainer was drafted by a language model (claude-sonnet-5) from an editor-approved outline and fact sheet, under the rules set out in our editorial policy, and carries no market figures. Last updated Jul 29, 2026.

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