What Is a Fixed Index Annuity?

By Hans Goldstein · Goldstein & Co. LLC · Updated April 2026

A fixed index annuity (FIA) is an insurance contract that lets your money grow based on a stock market index — like the S&P 500 — without ever losing money when the market drops.

It's not a stock. It's not a mutual fund. It's an insurance product with a floor of zero.

How It Works — Simply

  1. You deposit money with an insurance company
  2. Your account is credited interest based on how a market index performs
  3. If the index goes up, you earn a portion of the gain (subject to a cap or participation rate)
  4. If the index goes down, you earn zero for that period — but you never lose principal
  5. Gains are locked in annually and become your new floor
The key concept: You participate in some of the upside, but none of the downside. Your worst year is 0% — not -20% or -38%.

Caps, Spreads, and Participation Rates

The insurance company limits your upside in exchange for protecting your downside. The three main methods:

MethodHow It WorksExample
Cap RateMaximum you can earn in a periodS&P gains 14%, your cap is 9% → you earn 9%
Participation RatePercentage of index gain you receiveS&P gains 14%, participation is 60% → you earn 8.4%
SpreadIndex gain minus a fixed percentageS&P gains 14%, spread is 3% → you earn 11%

Who Should Consider an FIA?

Who Should NOT Get an FIA?

Common Misconceptions

"It's too good to be true"

It's not. You're trading maximum upside for downside protection. Over a 20-year period, an FIA will likely underperform a pure S&P 500 investment — but it will never have a year where you lose 38% of your retirement savings.

"They're all bad"

Some FIAs have excessive fees and complicated riders. Others are straightforward and competitive. The difference is in the specific product and how it's used within your overall plan.

"I'm invested in the stock market"

You're not. Your money is in the insurance company's general account. The index is just used as a measuring stick for how much interest you're credited.

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