Monthly Income from ₹10 Lakh — The Full Math of Post Office MIS vs Mutual Fund SWP

Introduction

For most of us the first home for retirement or pension money is the Post Office MIS or a bank FD — safe, certain, sleep-friendly. But it has a silent enemy: inflation. If prices rise at 5-6% a year, the purchasing power of your ₹10 lakh halves in about 10 years — even though the number on paper stays the same. The mutual fund Systematic Withdrawal Plan (SWP) exists to bridge that gap — where the capital keeps growing alongside the monthly income.

📚 This article is part of the Mutual Funds & Investment guide cluster — the full list and calculation tools are on that page.

Side-by-Side: ₹10 Lakh, 10 Years

Aspect	Post Office MIS (POMIS)	Mutual Fund SWP (Hybrid Fund)
Investment	₹10,00,000	₹10,00,000
Interest / estimated return	7.4% (fixed)	10-12% (estimated, with risk)
Monthly income	₹6,166	₹6,000
Total withdrawn in 10 years	₹7,39,920	₹7,20,000
Corpus after 10 years	₹10,00,000 (no growth)	approx. ₹16-18 lakh

The monthly income is nearly the same in both. The difference lies in the last row — with POMIS, after 10 years you have the same old ₹10 lakh (with roughly half its purchasing power); with an SWP, an extra ₹6-8 lakh.

How an SWP Works

In an SWP you stay invested in the fund, and on the date you set, the AMC sells a fixed amount and sends it to your account — the remaining units stay in the market and keep growing. Since each month you redeem only 0.5-0.6% of units while the fund grows more than 1% on average, the balance stays in your favour.

• Monthly withdrawal (₹6,000) < monthly probable gain (10% on ₹10 lakh = ~₹8,300 a month) → the corpus grows.
• Reverse the rule (excessive withdrawal) and the corpus starts eroding — so controlling the rate is everything.

To calculate with your own numbers, use the SWP Calculator.

The Tax Difference — This Is the Real Gain

• POMIS / FD: the entire interest is taxed at slab rate as “Income from Other Sources”. At the 30% slab, ₹6,166 of interest means roughly ₹22,000 of tax a year.
• SWP: most of each monthly withdrawal is a return of capital — no tax on top. Tax applies only to the gain portion, and in equity-oriented funds the first ₹1.25 lakh of long-term gains per financial year is completely tax-free. Details: Mutual Fund Taxation Guide.

How to Start an SWP

Whichever platform you buy on (the AMC’s own site, a distributor app, or MF Utility), the process is the same:

1. Make a lump-sum investment in the fund (or use existing units).
2. On the fund’s page, go to the ‘Set Up SWP’ / Withdrawal Plan option.
3. Choose the date (which day of the month), the withdrawal amount and the frequency (monthly); your bank account must be verified.
4. Submit and get confirmation — the money will arrive in your bank on the chosen day each month.

An SWP can be paused, modified or cancelled at any time — there is no penalty.

The Smart Move: A 50-50 Split

Rather than putting the whole ₹10 lakh in one place, splitting it in two is realistic:

• ₹5 lakh in POMIS — a guaranteed ~₹3,000 a month.
• ₹5 lakh in an SWP on a hybrid fund — withdraw ~₹3,000 a month, with the rest staying ahead of inflation.

You get certainty and growth — without betting everything on either one.

Things to Remember

SWP returns from mutual funds are not guaranteed — in a bad market the corpus may fall in the early years. So this route is only for money with a horizon beyond 5 years, and only with the family’s emergency fund kept separate.