Glossary

Participation rate

The percentage of an index's gain that an indexed annuity or IUL policy credits as interest, such as 80% of a 10% rise, or 8%.

Also called: par rate, index participation rate

A participation rate determines how much of a market index's positive change is used to calculate interest in an indexed universal life policy or fixed indexed annuity. It works alongside the cap rate, which limits the maximum credit, and the floor, which sets the minimum, usually 0%.

Formula: index credit = index gain × participation rate, subject to any cap. Say, hypothetically, the S&P 500 rises 10% over a crediting period. With a 70% participation rate and no cap, you're credited 7%. With a 100% participation rate and an 8% cap, you're credited 8%. If the index falls, you're credited 0% either way. Some uncapped strategies offer participation rates above 100%, often paired with a fee or tied to a volatility-controlled index rather than a well-known benchmark.

Participation rates usually aren't guaranteed beyond the current period; insurers can lower them at renewal, down to a contractual minimum. Rates depend largely on what the insurer can afford to spend on options, which moves with interest rates and market volatility. Ask for the guaranteed minimum and how renewal rates on existing contracts have changed. See IUL caps, participation rates and floors and fixed indexed annuities: caps, participation rates and trade-offs.

Last reviewed October 4, 2026

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Related terms

Cap rate The maximum rate an indexed universal life policy or indexed annuity will credit for a period, no matter how much the linked index rises. Floor The minimum rate an indexed universal life policy or indexed annuity credits for a period, often 0%, so index losses don't reduce the credited interest. Index crediting method The formula an indexed annuity or IUL policy uses to turn an index's movement into interest, such as annual point-to-point or monthly average. Indexed annuity A fixed annuity whose interest is tied to a market index's gains, limited by caps or participation rates, with a floor that shields it from index losses. Universal life insurance Permanent life insurance with flexible premiums and an adjustable death benefit, built on an account credited with interest and charged monthly costs.

Related guides

Annuity fees, explained The charges inside annuities: M&E, admin, fund and rider fees, surrender charges, commissions, and costs built into fixed rates. Fixed indexed annuities: caps, participation rates and trade-offs A fixed indexed annuity credits interest tied to an index with a zero floor. How caps, participation rates and spreads work, the real costs, and who it suits. How annuity rates are set and why they move Annuity rates come from an insurer's bond earnings minus costs and profit, plus mortality for income annuities. Why they move with bond yields and competition. Indexed universal life (IUL) explained How indexed universal life credits interest from a stock index, what it costs, how policy loans work and why illustrations are limited by regulators. IUL caps, participation rates and floors How caps, participation rates, spreads and floors turn an index's return into an IUL credit, with worked examples and what insurers can change each year. IUL illustrations and Actuarial Guideline 49 How the NAIC's Actuarial Guideline 49 limits the returns an IUL illustration may show, what changed in 2015, 2020 and 2023, and what it cannot do.

Related insurers

Allianz Life The Minneapolis-based U.S. arm of Germany's Allianz SE, a leading fixed index annuity seller that offers indexed universal life through financial professionals. Sammons Financial Group (Midland National and North American) Employee-owned group whose Midland National and North American units sell indexed universal life, term and fixed index annuities through independent agents.