Retirement Withdrawal Calculator

The 4% rule is a starting point, not a plan. See whether your withdrawal rate actually survives your retirement — across a thousand market histories, not one tidy average.

The 4% rule is the most famous number in retirement planning: multiply your savings by 4%, and that's roughly what you can spend in year one, rising with inflation after. It came from a careful study of history and it's a genuinely useful sanity check. But it was never meant to be a withdrawal strategy. It's a fixed rate applied to a worst-case past, and living by it literally means either overspending in good markets or, far worse, marching a rigid inflation-adjusted paycheck straight into a bad one.

Why a fixed rate is the fragile part

The danger isn't the 4%. It's the word fixed. If a deep bear market hits in your first few retirement years while you keep withdrawing the same real dollars, you're selling more shares at low prices to fund the same spending — and there are fewer shares left to recover when the market does. That's sequence-of-returns risk, and it's why two retirees with the same average return can end up in completely different places. A single average return hides it entirely; only running the whole path, year by year, reveals it.

Dynamic withdrawals: spend to the market you got

retireclarity models guardrail-style dynamic withdrawals — the Guyton-Klinger approach — instead of a rigid rate. You trim spending modestly after a bad stretch and let it rise after a good one, keeping the plan inside safe bands. Historically that lets you start higher than a static 4% and still finish safer, because the plan flexes with the markets you actually get rather than pretending every year is the average. The simulation below shows the difference as what actually matters: your probability of the money lasting.

What "safe" really looks like

A withdrawal plan isn't safe because a rule of thumb blessed it — it's safe when it survives the overwhelming majority of market lifetimes it could face. The sample below is the near-retirement couple Pat & Lee, tested against 1,000+ historical sequences with their real taxes, Social Security, and spending in the mix. Change the withdrawal and watch the odds move: that live trade-off between how much you spend and how likely it lasts is the whole point.

Want the deeper background first? Read why "average returns" will mislead your plan, or see the same engine framed as a Monte Carlo simulator. Or jump straight to the full withdrawal success simulator.