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Turning your retirement corpus into monthly income

Every retirement calculator ends at the same finish line: a lump sum on the day you stop working. Almost none of them explain what happens the day after — how that corpus actually turns into a monthly paycheque, for the next 25 or 30 years, without running out early or overpaying tax along the way.

The mechanism: SWP is a SIP running backwards

A Systematic Withdrawal Plan redeems a fixed number of units from your mutual fund on a schedule — usually monthly — and pays you the proceeds, while the rest of the corpus stays invested and keeps compounding. The core tension is simple: if your withdrawal rate is higher than your investment return, the corpus shrinks every month even while it's still earning something. If it's lower, the corpus can actually keep growing while paying you an income.

The number that changes everything: do you inflate the withdrawal?

Take a ₹1 crore corpus, an 8% expected return, and a ₹60,000/month withdrawal:

30 years
Flat ₹60,000/mo, never increased · ₹1.93 Cr left over
16 years
₹60,000/mo, stepped up 6%/yr for inflation · depletes to ₹0

That's not a rounding difference — it's the difference between "runs out in your late 70s" and "outlives you." The flat version looks safer on paper because the balance never depletes, but its real purchasing power quietly shrinks every year while prices don't stop rising. The honest question isn't "how long does the corpus last," it's "does this withdrawal still buy the same groceries in year 15 as it does in year 1" — and that's the version that actually matches how retirement expenses behave.

The tax bill most people forget to plan for

Each withdrawal is split into your original capital (tax-free — it's just your own money coming back) and the gain portion, which is taxed as long-term capital gains at 12.5% above a ₹1.25 lakh exemption each year (per Budget 2024).

What that costs, in real rupees
In the inflation-adjusted example above, roughly ₹1.93 Cr gets withdrawn in total over those 16 years, and about ₹9.3 lakh of that ends up owed as LTCG tax — money that reduces what you actually get to spend, and that most back-of-envelope "corpus ÷ years" retirement math never accounts for.

What this means for how you plan

Size your target corpus assuming an inflation-adjusted withdrawal, not a flat one — a flat number will always look more sustainable than it actually is. And budget for LTCG as a real, recurring cost of drawing down the corpus, the same way you'd budget for any other annual expense, not as a surprise at tax-filing time.