GMAB is an acronym that stands for guaranteed minimum accumulation benefit. A GMAB is an optional “living benefit” guarantee that can be embedded into a variable annuity product. The GMAB guarantees a minimum contract value—regardless of investment performance—after a set period of time. The minimum contract value is typically equal to or greater than the total premium. For example, Catherine invests $150,000 into a variable annuity and selects a GMAB. The capital markets have performed terribly and as a result the variable annuity contract value is only $75,000 at the end of 10 years. Catherine is in a good position though because the variable annuity contract value is still $150,000 at the end of 10 years.