What is a safe withdrawal rate?
How the commonly cited 4% rule works, and where it can fall short.
A withdrawal rate is simply the percentage of your starting corpus you draw out each year. Calling one “safe” means something specific: that the corpus, still earning a return while you draw from it, is expected to outlast however long you’ll need it — not that the number itself has some inherent magic to it.
What “safe” actually means here
This calculator’s own default inputs — a ₹50,00,000 corpus, ₹35,000/month withdrawal (an 8.4% initial rate), a 6% annual step-up, and an 8% expected return — run through the real computeSwp month-by-month simulation and deplete the corpus entirely in just 14.3 years, having withdrawn ₹91,42,854 in total. That’s not a safe withdrawal rate — it’s a demonstration of what happens once the withdrawal rate runs meaningfully ahead of what the corpus can regenerate.
Plan a systematic withdrawal from your corpus and see how long it lasts.
Rate alone isn’t the whole story
The commonly cited “4% rule” usually gets repeated as a single number, but what it actually assumes about how your withdrawals change over time matters just as much as the starting rate itself.
On the same ₹50,00,000 corpus at 8% expected return: a flat 4% withdrawal rate with no annual increasenever depletes at all — it’s still growing 50 years out. The same 4% starting rate with a 6% annual step-up (a more realistic stand-in for rising living costs) depletes at 37.7 years. Push the starting rate to just 5% with the same step-up, and it depletes at 27.3 years. The “4% is safe” shorthand quietly assumes something about how your withdrawals grow — change that assumption and the same headline rate stops being safe.
Where it falls short
Two things this simulation doesn’t capture on its own are worth knowing. First, the withdrawal horizon: the classic 4% figure was built around roughly 30 years of retirement, which is the same limitation covered in the 4% rule, explained — a longer retirement (or an early one) generally needs a lower starting rate than 4% to hold up. Second, this calculator (like the FIRE calculator) assumes a single smooth expected return every year, not the real up-and-down sequence markets actually deliver — which matters more than it might seem, as covered in sequence-of-returns risk. A withdrawal rate that survives a smooth 8%-a-year simulation can still fail against the real, bumpier path a portfolio actually takes, especially if a downturn lands early in the withdrawal period.
All figures are indicative and for educational purposes only — not financial advice.
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