Rent vs buy calculator

Before you calculate

How this rent vs buy estimate fits into a wider plan

The number should be treated as a planning checkpoint rather than an isolated answer. It is most useful when compared with a second scenario, because the difference between two choices often gives a clearer signal than a single calculation.

Keep the inputs consistent when comparing scenarios. Change one assumption at a time, then review how much the result moves. That makes it easier to see whether the decision is being driven by rate, term, contribution, balance, price or another variable.

If the estimate will affect borrowing, tax, savings or repayment decisions, leave a margin of safety. Real budgets include timing issues, irregular bills and changes in income, so the strongest plan is usually the one that still works when the figures are slightly less favourable.

Rent vs buy: the decision behind the number

Property growth is uncertain. A result that depends on strong house price growth should be treated cautiously, because prices can stall or fall, and selling costs can reduce the benefit.

Maintenance is often underestimated. Homeowners need to allow for repairs, replacements and service charges where relevant. Renters may avoid many of these costs, although rent can rise over time.

Turning the rent vs buy estimate into a practical next step

The right answer can change with timeframe. Buying often looks better over a longer stay because purchase costs are spread across more years. Renting can look better where you may move soon or need flexibility.

After calculating, test different assumptions for rent increases, mortgage rates, deposit size and property growth. The strongest decision is one that still makes sense under cautious assumptions, not only under the most optimistic version.

Buying usually brings costs that do not appear in rent: maintenance, insurance, repairs, legal work and future selling costs. These should be part of the comparison rather than treated as surprises.

Renting may look more expensive month to month, but it can preserve flexibility and keep savings accessible. That can be valuable if your job, family plans or location may change soon.

Test the comparison over different timeframes. Buying often needs time to absorb upfront costs, while renting can remain competitive where the likely stay is short.

Compare flexibility as well as cost. Renting can be financially weaker on paper but better if you may relocate.

Buying needs a maintenance allowance. Ignoring repairs makes ownership look cleaner than it is.

Include the opportunity cost of the deposit. Money used for a deposit cannot also sit in savings or investments.

Test low property growth as well as optimistic growth. A buying decision should not rely entirely on rising prices.

Consider how long you expect to stay. Transaction costs are easier to absorb over a longer period.

Check whether buying would leave any emergency fund. Moving into a home with no spare cash can create pressure quickly.

Buying often improves over longer periods because the upfront costs are spread out. If you expect to move soon, those costs have less time to be recovered.

Renting can preserve flexibility. That has value if work, family plans or location could change within a few years.

Include maintenance in the ownership side. A mortgage payment without repairs makes buying look cleaner than real ownership usually feels.

Do not assume house prices only rise. Test flat or modest growth so the buying case is not dependent on a perfect market.

After calculating, compare the result with your cash buffer. Buying with no emergency fund can make the first repair or job disruption much harder.