Rent vs Buy: A What-If Guide to the Break-Even Point

Most rent vs buy calculators give you a single number and call it a day. The truth is that the break-even point between renting and owning your home depends on a handful of assumptions you can only guess at: how fast property prices rise, how fast rents rise, what the mortgage rate is, and what you would earn on the money you did not spend on a down payment. This guide walks through those levers so you can build your own what-if picture — and then plug your numbers into the free scenario calculator.

The core trade-off

Buying converts a monthly rent payment into a mortgage payment plus maintenance, taxes, insurance, and transaction costs. In exchange you build equity and get exposure to property price growth. Renting keeps you liquid — the capital that would have gone into a down payment stays invested and continues to compound.

The rent vs buy question is really: over your time horizon, which stream of cash flows leaves you with more net worth? That depends on assumptions you control, not on a rule of thumb.

The five levers that move the break-even point

1. Property price growth

If home prices grow faster than general inflation, owning wins sooner. If they track inflation, the break-even point pushes out several years. If they underperform inflation — which has happened in many markets for long stretches — renting can win for a decade or more.

2. Rent growth

Owners lock in (most of) their housing cost at purchase. Renters do not. The faster rents rise, the sooner buying breaks even, because you are effectively hedging future rent inflation. In high-inflation environments this lever dominates.

3. Mortgage rate

A higher mortgage rate raises the monthly cost of ownership and increases the total interest paid over the life of the loan. Every extra percentage point pushes the break-even point further into the future. This is why the same house can be a reasonable buy at 3% and a poor one at 7%.

4. Deposit / investment return (investing the difference)

This is the lever most calculators quietly ignore. If you rent instead of buying, the money that would have been a down payment stays in your portfolio and keeps compounding. If that portfolio earns a real return above what your home appreciates by, renting can be the mathematically better choice even in markets that are "obviously" rising.

Our calculator models this directly: side by side with the "buy your own home" scenario, you can run a "keep the capital in a deposit and continue renting" scenario using the same inflation, rent growth, and horizon.

5. Transaction and holding costs

Buying and selling a home has friction: agent fees, taxes, notary and legal costs, renovations, maintenance, insurance. These do not disappear because prices rose. Short holding periods rarely recoup them. A common rule of thumb is that owning starts to make sense somewhere between years 5 and 10, but the honest answer is: it depends on the five levers above.

A worked what-if

Consider two scenarios over a 15-year horizon with identical starting capital:

• Scenario A — Buy: use the capital as a down payment, take a mortgage, stop paying rent after the build-out months, and let the property appreciate.
• Scenario B — Rent and invest: keep the capital in a deposit at the country's typical after-tax rate, continue paying rent, and let rent grow with inflation.

Change one lever at a time. Nudge property growth from 3% to 5% — the buy line pulls ahead earlier. Push mortgage rate from 4% to 7% — the deposit scenario catches up. Raise the deposit rate — the rent scenario wins for longer. This is what "sensitivity analysis" means in plain English: which assumption is the answer most sensitive to?

How to use the calculator for your own case

1. Pick your country preset — it fills sensible defaults for inflation, deposit rates, and typical costs.
2. Enter your starting capital and current rent.
3. Open scenario A House, set the property price, and adjust the down payment or loan amount. The model tracks mortgage interest and the moment you stop paying rent.
4. Open scenario B Deposit as your "rent and invest" comparison.
5. Compare the horizon chart. The scenario line that ends higher is what your assumptions predict — nothing more.
6. Change the property growth and mortgage rate one at a time to see which lever the answer depends on most.

Things the tool does not decide for you

Housing is not a purely financial question. Stability, family circumstances, mobility, and how much you value being able to change the color of your walls are not in the spreadsheet. Use the numbers to bound the trade-off, then decide as a human.

Try it now

Open the scenario calculator →

This article is educational and does not constitute investment, financial, tax, or legal advice. All outputs of the calculator are arithmetic projections of the assumptions you enter. Past performance does not guarantee future results.