Home buying · 6 min read

How much house can you afford? A first-time buyer's guide

The advertised price is only the start. Before you tour a single property, you need to know the price you can actually qualify for — and what your monthly payment will really be.

The number lenders actually look at

The price a seller is asking is not the price you should offer. Lenders do not lend against the value of the house alone; they lend against what you can comfortably repay. The single biggest influence on that is your debt-to-income ratio, or DTI — the share of your gross monthly income that already leaves your pocket for debt.

Work out the figure, then compare it with what you can afford. Our debt-to-income calculator takes your monthly debt payments and gross income and returns the percentage, so you can see where you stand before you apply.

A DTI below 36% is generally comfortable. Between 36% and 49% you will find lenders willing but with less headroom; 50% or more is a strong signal that existing obligations are squeezing the budget. These are guidelines, not rules — some lenders weight other factors more heavily, and anyone relying on the mortgage calculator alone is looking at the wrong number.

What your monthly payment really is

The number a lender quotes is usually the principal-and-interest payment. That is the part that pays down the loan and compensates the lender. But it is not the whole monthly cost of owning a home.

Property taxes, homeowners insurance, mortgage insurance (where the deposit is less than 20%), service charges and, in some areas, homeowners association dues all sit outside the advertised figure. Add a maintenance reserve of roughly 1% of the home value each year, and the real cost is meaningfully higher than the headline payment.

Use the mortgage calculator to see the pure principal-and-interest figure for a given price, down payment, rate and term. Then use the mortgage affordability calculator to work backwards from a monthly amount you can carry — that gives you the price you can actually borrow, not the price you can qualify for on paper.

A simple way to start

If you are not sure where to begin, follow the same steps in roughly this order.

First, write down the monthly amount you are comfortable committing to the house — comfortably, not at the absolute edge. Second, run that amount through the affordability calculator to get the price you could support. Third, work back through the mortgage calculator on a couple of prices to see what the payment actually looks like at both ends. Fourth, re-run the debt-to-income calculator once you have added the new housing payment, so the figure still sits below the line.

This order matters. Fixing the payment first, then asking what price it buys, keeps the decision anchored to what you can live with rather than to what a lender will stretch to offer.

Test the final shape with the savings goal calculator if you are also building a deposit. Holding the deposit, the payment and the debt load together in one mental model is how the numbers stop feeling like a list and start feeling like a plan.

Keep the estimate honest

Every figure in this guide is an estimate. Interest rates move, taxes and insurance premiums change, and a loan is a long commitment with no guarantee of steady income in the background. Treat any online calculator as a planning tool and a conversation starter with a lender, not as a promise of what you can borrow.