Annuity guide
Fixed index vs fixed annuity
Both are insurance contracts. Both keep your principal away from the stock market. The difference is one line in the contract: how interest gets credited. That single line changes what you can predict, how long your money is committed, and what you are really being paid for.
Last updated September 20, 2026 · Reviewed against our editorial methodology
The short version
A fixed annuity credits a declared rate you can read before you sign — 5%, for example, for the term. A fixed index annuity (FIA) credits interest based on how an index performs, limited by a formula and protected by a floor of zero. One sells certainty; the other sells a share of upside with the downside removed.
How each contract credits interest
| Fixed annuity | Fixed index annuity | |
|---|---|---|
| Interest source | A declared rate set by the insurer | Index performance, filtered through a formula |
| Predictability | You can calculate the maturity value exactly | Only the floor is certain |
| Market exposure | None | None — the index is a measuring stick, not an investment |
| Downside | 0% credited, never negative | 0% credited, never negative |
| Typical surrender length | Often 3 to 10 years, matching the term | Often 7 to 10+ years, longer when a bonus is taken |
| Optional income rider | Available on some contracts | Commonly the main reason these are sold |
Note what both share: neither can lose principal to a market decline. That is the marketing headline of an FIA, and it is also true of an ordinary fixed contract — which is usually simpler and easier to compare.
Caps, participation rates, spreads
An FIA limits your share of the index in one of three ways, sometimes all three at once:
- Cap. The maximum interest credited, whatever the index does. Index up 14%, cap 8% — you receive 8%.
- Participation rate. You receive a percentage of the index change. Index up 10%, participation 50% — you receive 5%.
- Spread or margin. A fixed amount is subtracted from the index change. Index up 9%, spread 2% — you receive 7%.
The crediting period matters
The same index can produce a very different credit depending on how the contract measures it:
- Annual point-to-point. One measurement, once a year. Simple, and it can miss a strong year that finished flat.
- Monthly averaging. The twelve monthly changes are added and the sum is capped. This usually pays better in choppy markets and worse in a straight-line bull market.
- Point-to-average. The average of several values is compared with the start. Smoother, less dramatic either way.
Two contracts from the same insurer, same index, same cap, can credit different amounts because of this choice alone.
Four worked examples
Illustrative only. Each assumes a $100,000 deposit, one year, and the crediting rules shown.
| Year's index move | Fixed annuity at a declared 5.40% | FIA: 8% cap | FIA: 40% participation, no cap |
|---|---|---|---|
| Index +9% | $5,400 | $8,000 | $3,600 |
| Index +4% | $5,400 | $4,000 | $1,600 |
| Index +1% | $5,400 | $1,000 | $400 |
| Index −12% | $5,400 | $0 (floor) | $0 (floor) |
Read down the columns, not across. The fixed contract pays the same every year — that is the product. The capped FIA beats it in a strong year and trails it in a modest one. The 40% participation contract almost never wins, which is why a low participation rate with no cap is often a worse structure than a lower cap.
The bonus and the surrender tail
Many FIAs pay a premium bonus — a 5% addition, say — in exchange for a longer surrender schedule. The arithmetic is simple and rarely shown: a 5% bonus on a ten-year surrender period is worth about 0.5% a year. If the alternative contract has no bonus but a five-year surrender schedule, you have paid roughly half a point a year for five extra years of not being able to leave without a charge.
Where each one disappoints
Fixed annuity:
- Renewal rates on book-rate contracts can fall to the contractual minimum after year one.
- A long term means your money is committed while rates may rise elsewhere.
Fixed index annuity:
- Years of 0% credits are common in flat or falling markets, and rider fees still run.
- Caps can be reduced annually, so the credit you saw in year one may not repeat.
- Surrender periods are longer, especially with a bonus, and a market value adjustment can apply.
- Illustrations that assume a constant 5% or 6% index return every year paint a picture the crediting formula will rarely deliver.
Which to shop, and how
- Decide what you are buying. A rate, or lifetime income. If you want income, compare SPIAs before you pay for a rider — see what an income rider costs.
- Shop the term, then the rate on the fixed side; see current rate ranges by term.
- On an FIA, ask for the full formula per index option — cap, participation, spread, crediting method, and guaranteed minimums.
- Ask for the cap history on that product over the last five years, not the current cap alone.
- Read the surrender schedule and free withdrawal allowance before any conversation about bonuses or riders.
- Check the insurer's rating. Every guarantee here is only as strong as the company making it.
Frequently asked questions
- How does an indexed annuity differ from a fixed annuity?
- A fixed annuity credits a stated rate of interest that you can read before you sign. A fixed index annuity credits interest based on the performance of an index, subject to a cap, participation rate or spread, with a floor of zero. The fixed contract gives certainty; the indexed contract gives a share of some market upside and the same protection from market losses.
- Can you lose money in a fixed index annuity?
- You will not lose principal because an index fell — the floor prevents negative interest credits. You can still lose money by surrendering early and paying a surrender charge and a market value adjustment, by paying rider fees that exceed the credited interest, or if the insurer fails beyond your state guaranty association's limit.
- Is a fixed index annuity better than a fixed annuity?
- Not in general. Over a full market cycle, the average credit on an indexed contract at a given insurer is often close to or below the declared rate on its own fixed contract, because the floor and the upside limits are priced. An indexed contract is better only if you specifically want participation in an index and are willing to accept less predictable credits to get it.
- What is a good cap rate on a fixed index annuity?
- There is no absolute good cap; it has to be read with the rest of the formula. A 12% cap with a 50% participation rate and a 2% spread credits less than a 9% cap with no other limits. Ask the agent to quote the complete formula for each index option and to show the historical cap changes.
- Do fixed index annuities pay dividends?
- No. The index is used only as a measuring stick. You do not own the index, you do not receive its dividends, and a falling index does not cost you principal — it just means little or no interest is credited for that period.
- What is a premium bonus on a fixed index annuity?
- An up-front addition to your account, often 2% to 10%, offered in exchange for a longer surrender period. It is not free money: it is amortised across the surrender schedule, so the effective value is the bonus divided by the number of years you must stay.
Sources
- FINRA — Rule 2330, suitability and disclosure requirements applying to deferred annuities.
- 26 U.S. Code § 1035 — tax-free exchanges of annuity contracts.
- Internal Revenue Service — Publication 575, Pension and Annuity Income.
- National Organization of Life & Health Insurance Guaranty Associations — state coverage limits.
- State insurance department product filings and insurer rate sheets, reviewed at the date shown above.