A Guaranteed Minimum Accumulation Benefit (GMAB) is an annuity rider that guarantees the account value will be at least a stated minimum on a future anniversary if contract conditions are met. The Guarantee base may grow by a fixed roll-up or step-ups to higher market values, but it is a benefit calculation, not a separate cash account. Early withdrawals, excess withdrawals, or allocation rules can reduce the guarantee, and rider fees apply. At the measurement date, if the actual account value is below the guarantee, the insurer increases it to the guaranteed level. GMAPs aim to provide a floor under long-term accumulation while preserving market participation potential.

Advisors add GMABs for clients targeting a minimum value at a retirement date. They explain roll-up or step-up rules, fees, allocation constraints, and how withdrawals affect guarantees. At the anniversary, they verify whether the guarantee elevates the value and reassess allocations for the next term.