The break-even formula, in plain English

The question “should I buy or rent?” has one honest answer and dozens of dishonest ones. The honest answer is a single comparison: what does it cost you, in net rupees, to own this specific home for the next ten years versus renting an equivalent home for the same ten years? Every other framing — “rent is dead money”, “an EMI builds an asset”, “property always appreciates in India” — is a shortcut that your parents used when housing was scarce, interest rates were 7%, and the BSE index compounded at 9%. None of those assumptions hold in 2026.

The formal comparison is called the price-to-rent ratio, and its break-even version looks like this:

Every serious answer to the buy-vs-rent question is some version of this equation. The inputs change, the assumptions change, but the structure does not. The mistake most buyers make is ignoring the opportunity cost term — the return you forgo on the down payment and on the monthly savings of renting, by locking that capital into a home. Without that term, buying always looks cheaper. With it, the answer depends on numbers your parents never had to calculate because Indian equity markets did not reliably compound at 11% until the 2000s.

Why “rent is dead money” is often wrong in India

The “rent is dead money” argument assumes two things that used to be true and no longer are. First, that home prices in Indian metros appreciate at 8–10% per year indefinitely. Second, that the alternative to a home loan is keeping money in a savings account earning 3%. Both assumptions were reasonable in 2008. Neither is reasonable in 2026.

Take Bengaluru. The city’s average residential price has grown at roughly 5.2% CAGR over the last decade (NHB Residex, 2014-2024). Mumbai’s Worli has done about 3.8%. Gurgaon’s prime sectors have done 6.1%. An index fund tracking the Nifty 500, over the same decade, has compounded at 12.4%. The down payment you put into a ₹1.5 crore home in 2014 would be worth ₹2.9 crore today in an index fund, while the home itself would be worth about ₹2.5 crore. That is before you add the EMI-vs-rent delta, which is another ₹40–50 lakh of compounding capital.

This does not mean buying is always wrong. It means buying is a decision with real opportunity costs that Indian middle-class narratives systematically hide. The buy-vs-rent math tips in favour of buying when any of these are true: you plan to live in the home for 10+ years, you are buying in a locality with credible 7%+ annual appreciation, you have access to a sub-9% home loan rate, or you would otherwise put the down payment into a low-return instrument (FDs, gold, savings). It tips toward renting when: your horizon is under 7 years, the home is in a saturated metro core, your effective home-loan rate is 9.5%+, or you are a disciplined equity investor.

The five inputs that change the answer

There are precisely five variables that decide whether buying or renting wins for any given property. Everything else is a distraction. Get these five right and you have the answer; get any of them wrong and the conclusion flips.

1. Tenure (how long you will live there)

The single most decisive variable. Registration costs (stamp duty 5-7%, registration 1%, GST on under-construction 5%) eat up 6-13% of the purchase price on day one. You need at least 7 years of appreciation and EMI-principal buildup to recover those. Under 5 years, renting almost always wins. Over 12 years, buying usually does. Between 5 and 12, it depends on the other four.

2. Down payment size

Larger down payments reduce EMI (good) but also increase opportunity cost (bad, because that cash can no longer compound in equity). The standard 20% down has become a mid-point — not a ceiling. A 40% down payment makes the monthly cash outflow much more comfortable but concedes a lot of compounding potential. For buyers with stable income and liquid equity portfolios, 20% is usually the right call. For buyers with one-time windfalls (bonuses, inheritances) and no strong equity discipline, 40-50% can be defensible.

3. Expected home appreciation

The input everyone guesses wrong on. Broker estimates of 10-12% are fiction; NHB Residex data for the last decade is 4-7% for most metros. Use the NHB number for your city, minus 1% as a realism discount, and you are close. Anything above 8% is an aggressive assumption that needs a specific thesis (metro line opening, IT corridor expansion) to back it up.

4. Opportunity cost of your capital

What would the down payment plus the monthly EMI-vs-rent delta earn if invested instead? For a buyer with a 10+ year horizon and equity-index discipline, 11-12% post-tax is a reasonable long-run assumption. For a buyer who would otherwise hold cash or FDs, 5-6% is closer. This is the input that tilts the math most and the one most buyers never calculate.

5. Home-loan tax benefit

Under Section 24(b), interest up to ₹2 lakh per year on a self-occupied home is tax-deductible. Under Section 80C, principal repayment up to ₹1.5 lakh per year is deductible (shared with PPF, ELSS and insurance). For a 30% tax bracket buyer, the combined annual benefit caps out at roughly ₹1.05 lakh. Meaningful but not decisive — it reduces the effective EMI by about 8-10% on a typical ₹80 lakh loan, not the 30% some brochures imply.

Try it yourself: the live calculator

Worked example: a typical Bengaluru buyer

Consider Priya, a 34-year-old product manager in Bengaluru earning ₹45 lakh a year. She is deciding between buying a ₹1.5 crore 3BHK in Sarjapur Road or continuing to rent an equivalent flat in the same neighbourhood for ₹45,000 a month. She has ₹50 lakh saved — enough for a 30% down payment plus registration — and a 12-year horizon. Her equity portfolio has compounded at 13% over the last five years.

Run her numbers through the calculator above: at 30% down, 8.75% interest, 20-year tenure, ₹45,000 starting rent, and 5% appreciation — which is roughly the NHB Residex rate for Sarjapur. The verdict flips depending on what she assumes for appreciation. At 5%, renting wins comfortably; at 7%, it is a coin toss; at 8%+, buying wins. Her honest answer is: “if I believe Sarjapur will compound at 7% or more over twelve years, buy. If I think it will compound at 5% like the broader market has, rent and keep investing.”

That kind of sensitivity is normal, not a flaw in the model. It is telling you that the buy-vs-rent decision is genuinely close in many Indian metros today, and that the single most important input — your view on local appreciation — is also the one you should be most humble about.

What the calculator does not capture

Three things deliberately sit outside the model, because they are qualitative and will bias the answer in ways you should decide consciously rather than let a number-crunch conceal.

Flexibility and friction

A renter can move across the city in a weekend for a job change; a homeowner with a ₹1 crore loan cannot. If your career or family shape is unsettled — new job every 3-4 years, likely to move cities — the flexibility premium of renting is real, large, and not captured in any spreadsheet. Rule of thumb: under a 5-year expected stay, buying is usually wrong regardless of what the math says.

Psychological ownership

Owning a home produces a specific kind of stability and identity that renting, in the Indian context, currently does not. Rental markets are landlord-friendly, brokerage is extractive, and the annual-notice culture is genuinely exhausting. Some buyers are happy to pay a 10-15% lifetime premium over the rent alternative purely to stop having those conversations. That is a rational choice, just not a financial one.

Tail-risk protection

A paid-off home at 55 is a retirement buffer you cannot lose to a market crash. If your career has tail risks (startup equity, commission-driven roles), the inflation-hedged, uncorrelated nature of residential real estate is worth something, even if the expected return is lower than equities. This is the strongest pure-finance argument for buying that the model does not capture.

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