SWP calculator

Every month is simulated exactly: the corpus grows at one twelfth of the chosen yearly return (converted the effective way or the nominal way, your pick), then the withdrawal comes out, with the step-up applied on each plan anniversary. When the balance can no longer cover a full withdrawal, what remains goes out as a final short payment and the plan is marked depleted. The survivor figure is the largest starting withdrawal that still completes every planned month, found by binary search over the same simulation.

What this does not do: no taxes on withdrawals, no exit loads, no dividend-stripping. The return is one flat average, but real funds deliver it in a sequence, and a bad early sequence drains a plan sooner than any average-rate model shows. A plan that never depletes here still depends on that average holding.