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Rent or buy: the maths most people skip

Comparing EMI with rent misses half the picture. A fair comparison follows both households and invests whatever the cheaper one saves.

, 2 min read

“Why pay rent when an EMI builds an asset?” It sounds right, but it compares the wrong things. A buyer spends a large sum upfront and usually more each month than a tenant. A fair comparison asks what the tenant could do with that money.

Follow both households

Our tool runs two households side by side, month by month:

  • The buyer pays the down payment, stamp duty and other purchase costs, then the EMI, maintenance and property tax.
  • The renter pays rent and invests what the buyer spent at purchase. Each month, whoever pays less invests the difference.

At the end, the buyer owns the home (minus any loan left and the cost of selling) plus anything they invested. The renter has their investments plus the security deposit back.

An illustration

A ₹50 lakh home, 20% down, a 9% loan over 20 years, 7% stamp duty and registration, ₹50,000 of other costs, maintenance at 0.5% of the value a year and ₹6,000 property tax. Rent for a similar home is ₹15,000 a month, rising 5% a year. Homes grow 5% a year. The renter earns 8% a year after tax. These are made-up inputs to show the mechanics, not market data.

  • In the first month the owner pays ₹38,572 (EMI ₹35,989, maintenance ₹2,083, tax ₹500) and the renter pays ₹15,000. The renter invests the ₹23,572 difference.
  • After 15 years: buyer ₹84.53 lakh, renter ₹1.09 crore. Renting and investing is ahead by ₹24.50 lakh, about ₹10.22 lakh in today’s rupees.
The first month, side by side
First monthBuyerRenter
EMI or rent₹35,989₹15,000
Maintenance and property tax₹2,583₹0
Paid in all₹38,572₹15,000
Invested₹0₹23,572
What each household has, year by year
  • Rent and invest the difference
  • Buy

Years from buying

See the numbers
Years from buyingRent and invest the differenceBuy
Year 1₹18.02 lakh₹12.20 lakh
Year 2₹22.29 lakh₹15.59 lakh
Year 3₹26.81 lakh₹19.19 lakh
Year 4₹31.62 lakh₹23.00 lakh
Year 5₹36.72 lakh₹27.05 lakh
Year 6₹42.14 lakh₹31.35 lakh
Year 7₹47.89 lakh₹35.92 lakh
Year 8₹54.00 lakh₹40.77 lakh
Year 9₹60.50 lakh₹45.93 lakh
Year 10₹67.40 lakh₹51.41 lakh
Year 11₹74.74 lakh₹57.23 lakh
Year 12₹82.53 lakh₹63.43 lakh
Year 13₹90.83 lakh₹70.03 lakh
Year 14₹99.65 lakh₹77.05 lakh
Year 15₹1.09 crore₹84.53 lakh

The buyer's home after selling costs and any loan left, plus investments; the renter's investments and deposit.

What flips it

The same tool shows where the answer changes, one input at a time:

  • If homes grew faster than about 6.58% a year, buying would win.
  • If the renter’s return were below about 5.64% a year, buying would win.
  • If the loan rate were below about 6.32%, buying would win.
What would make buying win
If this changesIn the illustrationBuying wins
Home price growth a year5%Above 6.58%
Your return after tax8%Below 5.64%
Home-loan rate9%Below 6.32%

One input changed at a time; the rest as in the illustration.

Try it

The two numbers nobody knows

5%
8%
₹15,000
Renting ahead after 15 years
₹24.50 lakh
In today's rupees
₹10.22 lakh
What each household has after 15 years
  • Buy₹84.53 lakh
  • Rent and invest the difference₹1.09 crore

₹50 lakh home, 20% down, 9% loan over 20 years, and the other costs in the illustration above.

Open the full calculator, with every input

So the result rests on two numbers you cannot know for sure: how fast home prices grow, and what you really earn on money you invest. Be honest about the second one. Renting only wins if the difference actually gets invested, every month, for years.

What the maths leaves out

Security of tenure, freedom to move for work, your savings tied up in one asset, landlord trouble and possession delays are all real and not in the numbers. The tool lists them so you can weigh them yourself. Home-loan tax benefits are not modelled yet either, which makes buying look slightly worse than it may be for some people.

Put in your own home price, rent and return to see your answer.

For education only. Not investment, tax or insurance advice. Examples use the figures stated in the guide; check your own before you act.