How to Use the Rent vs Buy Calculator
The Rent vs Buy Calculator gives you a comprehensive financial comparison of renting versus buying a home over any time horizon. It goes beyond the simple monthly payment comparison to factor in opportunity costs, investment returns, property appreciation, maintenance, and transaction costs.
Enter the home price, mortgage details, rent amount, and assumptions about property appreciation and investment returns. The tool calculates the total cost of each path over your chosen timeframe and shows you the break-even point — the number of years after which buying becomes cheaper than renting.
The key nuance most people miss is opportunity cost: the deposit and additional homeownership costs could alternatively be invested in the stock market. If your down payment earns 7% annually instead of sitting in a property, that return must be counted against the cost of buying. This often makes renting financially competitive for shorter time horizons.
📊 Worked Example
$400,000 home with 10% down vs renting for $2,000/month. Assumptions: 3% property appreciation, 7% investment return, 6.5% mortgage:
- Monthly mortgage (P&I): $2,275
- Break-even point: Year 7
- Total cost to own (10 yr): $390,000
- Total cost to rent (10 yr): $280,000 + foregone equity $94,000 net
Common Use Cases
- ✅ Deciding whether to rent or buy in your current city
- ✅ Understanding how long you need to stay to make buying worthwhile
- ✅ Comparing the financial impact of different down payment sizes
- ✅ Evaluating renting in an expensive city vs buying in a cheaper area
- ✅ Planning a property purchase around career or life changes
- ✅ Understanding how property price growth changes the rent vs buy math
- ✅ Factoring in transaction costs like stamp duty, agent fees, and solicitor costs
Frequently Asked Questions
Is buying always better than renting in the long run?
Not necessarily. It depends on property appreciation, local rent levels, investment returns, how long you stay, and transaction costs. In expensive cities where property prices are very high relative to rents, renting can be financially rational even over 10+ years.
What costs does buying have that renting doesn't?
Ownership adds: mortgage interest, property taxes, home insurance, maintenance (typically 1–2% of home value per year), stamp duty/closing costs, HOA fees if applicable, and the opportunity cost of your deposit capital. These can add £500–£1,500/month on top of the mortgage payment.
What is the price-to-rent ratio and what does it tell me?
The price-to-rent ratio divides the home price by annual rent. A ratio below 15 generally favours buying; above 20 favours renting; above 25 strongly favours renting. You can calculate it by dividing the purchase price by 12 months of comparable rent.
What is the break-even point?
The break-even point is the number of years after which the total cost of buying (including upfront costs amortised over time) equals the total cost of renting. Before this point, renting is cheaper. After it, owning typically becomes more cost-effective as equity builds.
Does renting throw money away?
Renting provides shelter, flexibility, and no maintenance responsibilities — it's not 'wasting money'. The opportunity cost of your down payment invested elsewhere, and avoidance of maintenance costs and transaction fees, means renting can build wealth too. The question is always which path builds more wealth over your specific timeframe.