Two retirees start with ₹1 crore each and withdraw ₹5 lakh at the start of every year. Both see the exact same three annual returns - a -30% year, a +10% year, a +20% year - averaging out identically. The only difference is the order. Retiree A gets the -30% year first. Retiree B gets it last, with the mirror-image sequence: +20%, then +10%, then -30%.

Run the same three returns with no withdrawals in between and the gap disappears entirely: 0.7 × 1.1 × 1.2 equals 1.2 × 1.1 × 0.7. Compounding on its own is just multiplication, and multiplication doesn’t care about order. A withdrawal breaks that. It locks in whatever the balance happens to be at that exact moment and removes it permanently, before the recovery that follows has a chance to apply to it. The -30% year isn’t the problem by itself - retiree B lived through the identical -30% year. The problem is which withdrawals had already happened by the time it hit.

This is why the danger window in retirement-income research isn’t “whenever markets fall” - it’s concentrated around the retirement date itself. The commonly cited “red zone” runs roughly five years before retirement through five to ten years after it; industry research on the effect finds returns five years into retirement move the outcome by about as much as returns ten years before it. Outside that window, a bad year is absorbed by a portfolio that either isn’t being drawn down yet or has already built enough of a cushion to withstand it.

Two documented responses treat this as a scheduling problem rather than a forecasting one. Jonathan Guyton and William Klinger’s 2006 guardrail rules cut spending by a fixed amount - commonly modelled around 10% - once a bad stretch pushes the current withdrawal rate more than 20% above the rate the retiree started with, and allow an increase under the mirror-image condition, replacing a discretionary decision with a mechanical one at the exact moment discretion is least reliable. Wade Pfau and Michael Kitces’s 2013 research went further, testing a rising rather than declining equity glide path through retirement - starting around 20-40% equity and increasing over time - and found it reduced both the odds and the size of portfolio failure, because it under-exposes the account to equities during precisely the years a crash does permanent, not temporary, damage.

The ₹1 crore example above is illustrative arithmetic, not a forecast - three chosen numbers, reordered, to isolate one mechanism. But the direction holds across the actual research: once withdrawals enter the picture, the order returns arrive in matters separately from what they average out to, and a plan that only answers “what return should I expect” hasn’t answered the question that actually determines whether the money lasts.

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