Fixed vs. Variable Annuity: What's the Difference?
Two annuities can share the same basic promise — turn savings into future income — while growing the underlying money in almost opposite ways. That difference is largely captured by whether the annuity is described as fixed or variable.
The short answer
A fixed annuity credits growth at a set rate specified by the insurer, offering predictability but generally limited upside. A variable annuity instead ties growth to the performance of underlying investment subaccounts, similar in spirit to mutual funds, which means the value can rise or fall depending on market performance rather than following a predetermined path. The tradeoff is essentially predictability versus growth potential, layered with a different risk profile for each.
How a fixed annuity grows value
A fixed annuity generally specifies a rate of return the insurer will credit during the accumulation phase, sometimes for a set period before the rate can adjust. Because the rate is set by the contract rather than by market performance, the owner generally knows in advance what growth to expect, at least for the period the rate applies. This structure tends to appeal to someone prioritizing certainty over the possibility of higher returns.
How a variable annuity grows value
- Subaccount investments. Money placed in a variable annuity is typically allocated among a menu of investment subaccounts chosen by the owner, each behaving somewhat like a fund invested in stocks, bonds, or a mix.
- Market-linked performance. Because the underlying subaccounts fluctuate with market conditions, the annuity’s value can grow more than a fixed annuity in favorable periods, or shrink in unfavorable ones.
- Optional guarantees. Some variable annuities offer optional features, often at an additional cost, that provide certain guarantees despite the underlying market exposure, though the specifics vary enormously between contracts.
Weighing predictability against growth potential
The choice between fixed and variable structures often comes down to how someone weighs risk tolerance against the desire for growth. A fixed annuity trades away upside potential for a predictable, contractually set outcome. A variable annuity accepts uncertainty in exchange for the possibility of outperforming what a fixed rate would have provided, along with the corresponding possibility of underperforming it. Neither approach is inherently superior — they serve different goals and different comfort levels with uncertainty.
How this connects to the rest of the contract
Whether an annuity is fixed or variable is a separate question from whether it’s immediate or deferred, and from what happens once the owner decides to begin annuitizing the contract’s value into income. A deferred variable annuity, for example, could see its accumulated value swing considerably during the years before payout begins, which is worth understanding well before that transition happens.
What to weigh
Fixed and variable annuities aren’t simply “safe” and “risky” versions of the same product — they’re built around fundamentally different growth mechanisms, each with its own costs, guarantees, and tradeoffs. Because annuity contracts differ widely in fees, guarantees, and terms, and because the underlying rules can change over time, understanding which category a specific contract falls into is the first step toward understanding what it actually offers.