FIA vs. MYGA — Which Fixed Annuity Is Better?

By Editorial Team

Published January 1, 2024 · Updated May 5, 2026

A Multi-Year Guaranteed Annuity and a Fixed Indexed Annuity can look similar on a product sheet — both are issued by life insurance carriers, both have surrender periods, both offer principal protection. The difference is how interest is credited, and that difference is large enough to change your accumulation outcome by tens of thousands of dollars over a decade.

The Structural Difference

A MYGA (Multi-Year Guaranteed Annuity) works like a bank CD inside an insurance wrapper. You deposit a premium, the carrier credits a fixed interest rate for the full surrender period — typically 3, 5, or 7 years — and you know from day one exactly what your contract value will be at the end of term. There is no index, no cap, no participation rate, no annual reset mystery. Your return is declared and guaranteed.

A Fixed Indexed Annuity does not guarantee a specific interest rate. Instead, it links your annual credit to an external index — often the S&P 500 Price Return index, though there are now dozens of proprietary alternatives. The carrier applies a crediting method (cap rate, spread, or participation rate) that limits how much of the index’s gain flows to your contract. In exchange for that ceiling, the floor is typically 0%: you cannot lose credited interest from a prior year due to index declines.

The core tradeoff: the MYGA gives you certainty, the FIA gives you participation in upside with downside protection — but the amount of upside you actually receive depends on factors the carrier can change annually.

How FIA Credits Are Actually Determined

Every year, the FIA carrier calculates how much the chosen index gained (or lost) during your contract year. They then apply the crediting method:

Under a cap rate, you receive up to that maximum — say, 9% — regardless of whether the index gained 12% or 30%. Under a participation rate, you receive a set percentage of the gain — if participation is 60% and the index gains 14%, you receive 8.4%, with no ceiling beyond that math. Under a spread, the carrier deducts a fixed percentage from the index gain — a 3% spread against a 10% index gain credits you 7%.

The crediting method is declared for one contract year at a time. The carrier can and does change it annually, subject to contractual minimums. This means the rate illustrated in year one is not guaranteed in year three.

When the MYGA Wins

The MYGA wins in environments where cap rates are low and the index performs strongly — because a high-performing index paired with a low cap means most of the gain is absorbed by the carrier. If a MYGA is offering 5.5% guaranteed and the FIA’s cap is 7% on an index that averages 11% annually, the effective credited return on the FIA may be only 5% to 6% after accounting for years where the cap binds. Certainty at 5.5% beats uncertainty at 5% to 6%.

The MYGA also wins in sideways or volatile markets where the index frequently delivers modest gains or flat years. An FIA with a 0% floor credits zero in those flat or negative years — which is better than a loss, but meaningfully worse than a guaranteed 5.5% that compounds without interruption.

Finally, the MYGA’s predictability has planning value. If you need a known sum in exactly seven years for a specific purpose — a mortgage payoff, a long-term care premium reserve — the MYGA’s certainty may be worth something independent of the yield comparison.

When the FIA Wins

The FIA wins in sustained bull markets with meaningful cap rates. If the S&P 500 gains 18%, 22%, 11%, and 15% in four consecutive years, a 10% cap still credits 10% four years in a row — compounding to roughly 46% over four years, versus a MYGA at 5.5% compounding to roughly 24% in the same period. The FIA’s inability to lose principal makes those positive years fully additive.

The FIA also wins when paired with a high participation rate on an index with strong risk-adjusted returns. Some proprietary volatility-controlled indexes have delivered participation rates of 100% to 200% — meaning you receive more than the index’s stated return — because those indexes are engineered to suppress volatility, which makes their options cheaper for the carrier to purchase. If the vol-controlled index averages 5% to 7% annually and you receive 150% of that, the FIA may outperform a MYGA even in moderate environments.

A Direct Comparison: Illustrative Scenarios

Scenario	MYGA @ 5.5%	FIA (9% cap, S&P 500 PR)
Strong bull market (avg +15%/yr)	+70% (10 yr)	+136% (10 yr, capped at 9% every yr)
Moderate growth (avg +7%/yr)	+70% (10 yr)	~55–65% (10 yr, mixed credited years)
Volatile / lost decade	+70% (10 yr)	~30–45% (10 yr, many 0% years)

These are illustrative scenarios based on crediting math, not predictions. The actual outcome of any specific FIA contract depends on the index chosen, the crediting method applied, how the carrier manages cap renewals, and the sequence of index returns across your specific contract years. There is no general answer to “which pays more” — there is only the answer for your specific contract and market environment.

Other Differences Worth Knowing

Tax treatment: Both MYGAs and FIAs grow tax-deferred inside non-qualified accounts. Interest is not taxed until withdrawn. This makes both products more tax-efficient than a CD or Treasury bond held outside a retirement account.

State guaranty associations: Both are backed by state insurance guaranty associations, not the FDIC. Coverage limits vary by state — typically $250,000 per carrier in most states, though some states set the limit lower for annuities. If you are placing a large premium, the carrier’s financial strength rating is a legitimate consideration.

Income riders: FIAs commonly offer optional Guaranteed Lifetime Withdrawal Benefit (GLWB) riders for an additional annual fee, which creates a separate income account growing at a declared rate. MYGAs rarely include such riders. If lifetime income is the primary goal, the FIA’s income-rider ecosystem may be the more relevant comparison point than raw accumulation returns. The team at RankMyAnnuity’s Income/IRR Calculator can evaluate any income stream, regardless of product type.

Surrender schedules: Both products penalize early withdrawal. MYGA surrender charges typically step down over 3 to 10 years. FIA surrender schedules often run 7 to 12 years and can include market value adjustments. Liquidity needs should be a primary filter before product selection.

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