What is the 5% rule for rent vs buy?

The 5% rule says that if annual rent is lower than 5% of a comparable home price, renting is usually cheaper. It is a screening shortcut, not a full decision model.

Does the 5% rule work in the UK?

It works as a first-pass check, but UK buyers also need to account for stamp duty, legal fees, council tax, maintenance, and expected holding period.

When should I use a full rent vs buy calculator instead of the 5% rule?

Use a full calculator when mortgage rate, deposit size, expected stay length, fees, or investment returns could materially change the result.

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5% Rule Rent vs Buy: The 30-Second UK Test

Forget complex spreadsheets. The 5% rule tells you whether renting or buying wins in under a minute. It is not perfect, but it is the fastest mental model for one of life's biggest financial decisions and it reveals why most people get this wrong.

Updated for UK readers and linked to our full rent vs buy calculator.

What Is the 5% Rule?

Multiply your target home price by 5%. If annual rent is less than that number, renting is likely cheaper. If rent is higher, buying probably wins.

Example: £400,000 home × 5% = £20,000 per year = £1,667 per month. If you can rent something comparable for £1,400 per month, renting saves about £3,200 per year. If rent is £1,800 per month, buying wins by about £1,600 per year.

The 5% approximates total homeownership costs: property tax or council-tax-equivalent drag, maintenance, and the cost of capital tied up in the deposit. It is a simplification, but a useful one. If you want to move from shortcut to real numbers quickly, run the Rent vs Buy Calculator against the exact property and rent you are considering.

Where the 5% Rule Comes From

Portfolio manager Ben Felix helped popularize the rule using a long-run ownership-cost framework. The classic breakdown is 3% opportunity cost, 1% property tax, and 1% maintenance.

UK costs are not identical to US or Canadian costs. Council tax is usually lower than US property tax, but stamp duty and legal costs are much more painful upfront. That means the rule is directionally useful, but you still need to adapt it to your market and your expected holding period.

The rule works best for apples-to-apples comparisons: similar size, location, and quality. Comparing a small rented flat with a bought family home breaks the logic immediately.

When the 5% Rule Fails

High-appreciation markets: London, Manchester, and Edinburgh can deliver appreciation that overwhelms a simple cost comparison. The rule ignores equity buildup and leverage.

Short time horizons: if you expect to move in under 5 years, transaction costs dominate. Stamp duty, legal fees, surveys, and selling costs can wipe out any monthly advantage.

Emotional factors: stability, freedom to renovate, school catchment certainty, and pride of ownership matter. The 5% rule is purely financial, so keep emotional value separate rather than hiding it inside the math.

5% Rule vs. Detailed Calculator

Use the 5% rule for screening. Use a detailed calculator for the real decision. Our Rent vs Buy Calculator models mortgage interest, stamp duty, maintenance, insurance, deposit opportunity cost, and inflation-adjusted investing returns.

Real example: the 5% rule can say "rent" on a £350,000 home with £1,300 monthly rent. But with a 4% mortgage rate and a 7-year stay, buying can still win because equity buildup and leverage change the outcome. The shortcut misses that.

UK-Specific Adjustments to the 5% Rule

Stamp duty: treat it as an annualized cost over your expected stay. If stamp duty and legal fees total £10,000 and you plan to stay 7 years, that is roughly £1,429 per year of extra ownership cost before you even count repairs.

Council tax: a £1,500 annual council tax bill on a £300,000 home is another 0.5% drag. In practice, many UK buyers should think in a 4.5% to 5.5% range depending on location and time horizon rather than treating 5% as sacred.

Short stays: if you are buying for only 3 to 5 years, push the threshold higher because upfront fees need to be amortized over fewer years.

The Psychology Trap

"Renting is throwing money away" is emotionally persuasive and financially sloppy. A renter who keeps the deposit invested can compound meaningful wealth while keeping flexibility.

Test yourself: if the 5% rule says rent, can you accept that answer? Or do you immediately search for a reason this market, this property, or this year is somehow different?

Action Step: Run Your Numbers

Find comparable rental and sale listings in the exact area you are considering.
Apply the 5% rule as a first-pass screen.
Use the detailed calculator to model your deposit, mortgage rate, and time horizon.
Stress-test the decision against a shorter stay and a higher mortgage rate.

The 5% rule is a starting point, not a destination. The calculator is the destination.

Related Guides

Run the full comparison

Use your own rent, mortgage rate, deposit, and holding period to see the exact break-even year instead of relying on a rule of thumb alone.

Use the Rent vs Buy Calculator →