Sequence of returns risk, explained
Why the order your returns arrive in matters as much as their average.
Two retirees can earn the exact same set of annual returns, in the exact same average, and still end up with meaningfully different retirement corpuses — purely because of the order those returns arrived in. This only happens once you’re withdrawing money along the way, which is exactly the phase every SWP and retirement plan is built around.
“It’s not the average return that determines whether your money lasts. It’s when the bad years happen.”
The demonstration: same returns, different order
Take five annual returns: −15%, −10%, 5%, 15%, and 25%. Run them in that order — bad years first — against a ₹50,00,000 corpus with a fixed ₹4,00,000 withdrawn at the start of each year, and compare that to running the identical five returns in reverse — good years first.
Bad-years-first: the corpus ends at ₹30,89,366. Good-years-first — the same five returns, same withdrawals, just reordered — ends at ₹39,74,696. That’s nearly 29% more surviving corpus, from literally the same returns.
| Order | Ending corpus |
|---|---|
| Bad years first (−15%, −10%, 5%, 15%, 25%) | ₹30,89,366 |
| Good years first (25%, 15%, 5%, −10%, −15%) | ₹39,74,696 |
The sanity check that proves this is really about order, not returns: without any withdrawals at all, both sequences compound to the exact same ₹57,73,359 — multiplying the same five numbers together gives the same product regardless of order. The moment withdrawals enter the picture, that symmetry breaks completely.
Why withdrawals make order matter
A withdrawal made during a down year permanently removes capital that never gets the chance to participate in the recovery that follows — you’ve locked in that loss. A withdrawal made during an up year removes capital that has already grown, leaving the rest of the portfolio larger and better cushioned for whatever comes next. Same withdrawal amount, same five returns — but which capital it comes out of depends entirely on when the bad years land.
This risk is invisible to any calculator — including the SWP, FIRE, and Retirement Corpus calculators on this site — that models future returns as a single flat annual rate. That flat-rate assumption describes the average case; it can’t describe which specific years turn out to be the bad ones, which is exactly what determines whether a real retirement plan survives them.
Plan a systematic withdrawal from your corpus and see how long it lasts.
How to actually protect against it
Since you can’t control which years turn out bad, the practical response is to build in a margin that absorbs a bad sequence whenever it happens to land:
- Keep a cash or bond buffer— 1 to 3 years of expenses held outside equities means a down year doesn’t force you to withdraw from a shrunken portfolio at the worst possible time
- Use a flexible withdrawal rate — trimming spending slightly in a down year, rather than withdrawing the same fixed amount regardless, reduces exactly the damage this article demonstrates
- Plan around a more conservative withdrawal ratethan the long-run average return would suggest is “safe” — the margin is what protects you if your own retirement happens to start with a bad sequence, not a good one
The FIRE and Retirement Corpus calculators help size the corpus itself; the SWP Calculator below is the one to actually stress-test a withdrawal plan against.
All figures are indicative and for educational purposes only — not financial advice.
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