Fixed vs. Fixed-Indexed Annuity: Which Is Which?

What is the difference between a fixed and a fixed-indexed annuity?

Both products belong to the same family. Each is a contract with an insurance company, each grows tax-deferred, and each can later be turned into income. If the whole category is new to you, start with our plain-English guide to what an annuity is and come back. The difference between these two lives in one place: how the insurer decides how much interest to credit to your contract each year.

A fixed annuity answers that question before you sign. The insurer declares a rate, guarantees it for a stated period, and credits it on schedule. A fixed-indexed annuity answers the question one crediting period at a time. The insurer watches a market index, applies the contract's crediting formula to the index's movement, and credits the result, which can be strong in a good index year and zero in a bad one.

All guarantees in both products are backed by the claims-paying ability of the issuing insurer. They are not FDIC-insured and not bank deposits.

How does a fixed annuity work?

A fixed annuity is the simpler of the two. You deposit a sum, the insurer declares an interest rate, and that rate is guaranteed for a set term. The most common version, a multi-year guarantee annuity or MYGA, locks the declared rate for the full term, so the growth is boring in the best sense: you can calculate it on the back of an envelope the day you sign.

The interest compounds tax-deferred, meaning you owe no tax on the growth until you take it out, and withdrawn gains are then taxed as ordinary income. At the end of the term you can typically renew at a new declared rate, exchange into a different contract, or walk away. The honest cost is commitment. Leave during the surrender period and the insurer keeps a percentage, which is why a fixed annuity is often compared to a bank CD with different rules and a different backstop. Our annuity vs CD comparison walks through that matchup in full.

How does a fixed-indexed annuity work?

A fixed-indexed annuity, often shortened to FIA, replaces the declared rate with a formula. Your credited interest for each period is calculated from the movement of a market index. The index is a measuring stick, not an investment. Your money sits in the insurer's general account, you own no stocks, and you collect no dividends.

The trade has two sides. The floor means a down index year does not subtract from your credited value; the worst crediting outcome in a bad period is typically zero rather than a loss. In exchange, the contract limits your share of the good years. That protection is not the same as a promise the contract can never shrink: rider fees can still pull the value down in a year that credits little or nothing, and surrender charges apply if you leave early. A statement that reads zero for a year is a normal FIA outcome, not a malfunction, and anyone selling the product should say so up front.

The floor and every other guarantee are backed by the claims-paying ability of the issuing insurer, not the FDIC. For the wider product family, including immediate and deferred income annuities, see our types of annuities guide.

What do caps, participation rates, and spreads actually do?

These three levers are how an FIA pays for its floor, and they are where most surprises hide. A cap is a ceiling on the interest you can be credited in a period, no matter how far the index climbs. A participation rate credits you only a stated portion of the index's gain. A spread subtracts a hurdle from the index's gain before anything is credited at all. Some contracts use one lever, some combine them.

Two things matter more than the starting numbers. First, most contracts exclude dividends from the index calculation, so the measuring stick already reads lower than the headline index you see in the news. Second, the insurer can usually reset caps, participation rates, and spreads within stated bounds at each renewal. A contract that looks generous in year one can be tightened in year three, legally and by design. None of this is scandalous, but it should be said out loud before you sign, and it is the reason the renewal history of an insurer is worth asking about directly.

Fixed vs. fixed-indexed annuity, side by side

Comparison is educational and general. Contract terms control; read the contract and the disclosure documents before deciding anything. If insurer strength worries you, our post on what happens if an annuity company fails explains state guaranty associations and their limits.

Which one fits, and when are both the wrong choice?

A fixed annuity tends to fit savers who want CD-style predictability without annual tax on the interest, who can commit money for the full term, and who would rather know the answer than hope for a better one. A fixed-indexed annuity tends to fit people who want a protected slice of savings to have variable growth potential, who can leave the money alone through the surrender period, and who are willing to read the crediting terms closely enough to explain them back in their own words.

Both are the wrong choice in the same situations. If you might need the money back during the surrender period, liquidity comes first and neither product respects that need. If growth is the actual job, investments do that job; an annuity's job is certainty, and an FIA's limited upside is not a stock substitute. And if anyone urges you to move most of your savings into either contract, slow down. Our self-check guide, is an annuity right for me, and our post on who should not buy an annuity both take the walk-away side seriously.

Before choosing either, put these questions to the person recommending it:

1. What is the surrender schedule, year by year, and exactly what would leaving cost me in the first year?
2. For a fixed annuity: what happens to the rate at renewal, and what are my options at the end of the term?
3. For a fixed-indexed annuity: what are the current caps, participation rates, and spreads, how often can they change, and what is this insurer's renewal history?
4. What does each optional rider cost per year, and would the contract still make sense without it?
5. What are the issuing insurer's financial strength ratings, and from which rating agencies?

Prefer to watch first?

"The Descent," our short education film

Why retirement's riskiest years come after you stop working, and the honest way to weigh each risk. About twenty minutes, plainly labeled Annuity Explained education.

Watch the film →