Rent or buy?

What the calculator actually compares

The tool doesn't ask "is buying good?" It runs two parallel money stories over the years you choose and shows which one leaves you wealthier at the end. On the renting side you pay rent, and in any month buying would have cost more, you invest that difference and let it grow. On the buying side you pay the mortgage, ancillary purchase costs, upkeep and running costs, and in return you slowly own an asset whose price may rise or fall. At the finish line it compares two net-worth figures: the renter's investment pot versus the buyer's home value minus any remaining loan. Say buying costs 2,000 a month all-in and renting costs 1,500 (illustrative). The renter invests that 500 gap every month. Whether their growing pot beats the buyer's growing equity is exactly the question the tool answers. Change one assumption and the winner can flip, which is the whole point of running it rather than trusting a gut feeling.

Break-even is really a time question

The single biggest lever is how long you stay. Buying front-loads large one-off costs, purchase taxes, agent and notary fees, moving expenses, that renting simply doesn't have. In the early years those sunk costs dominate, so renting-and-investing usually looks ahead. Buying catches up only once enough time passes for equity growth and paid-down loan principal to outweigh that initial hit. The year where the two lines cross is your break-even point. Say your upfront buying costs run to 8 percent of the price (illustrative): that's a deep hole to climb out of, and it might take many years of ownership to recover. The expensive mistake is buying with a short or uncertain horizon, then moving before break-even and eating those one-off costs twice. Read the tool this way: find the crossover year, then ask honestly whether you'll realistically still be there. If the answer is no, the maths leans toward renting. This is general education, not a prediction about your own market.

The costs buyers quietly forget

People often compare rent against the mortgage payment alone, and that comparison is rigged in buying's favour. Ownership adds maintenance, insurance, property charges and the occasional large repair (a roof, a boiler) that rent never asks of you. A common planning rule sets aside roughly 1 percent of the home's value each year for upkeep (illustrative), which on a 300,000 home is 3,000 annually, or 250 a month you must feel but rarely picture. The subtlest cost is opportunity cost: your down payment is money that could otherwise be invested and compounding. Tie up 60,000 as a deposit and you forgo whatever that sum might have earned elsewhere, so the calculator counts it against buying. Renting isn't cost-free either; your invested savings face real market risk and possible rent rises. But the honest comparison only works once every buying cost, not just the loan, sits on the scale.

Stress-test your price-growth guess

The result hinges on one number you cannot know: how fast the home's value grows. It's tempting to type in an optimistic figure and let it carry buying to victory, but that's where forecasts quietly become wishful thinking. Small changes here swing the outcome hard, because price growth compounds across every year you own. So don't run the tool once. Run it three times, with a pessimistic, a modest and an optimistic growth rate, say 0, 2 and 4 percent a year (illustrative), and watch how far the answer moves. If buying only wins under the rosiest assumption, the case is fragile and you're betting on a market call. If buying wins even when you assume prices barely move, the case is robust and rests on the numbers, not on hope. Do the same with how long you stay. A result that survives your cautious inputs is one you can actually lean on.