Home Affordability Calculator 2026

How It Works

This calculator works backward from your finances to a home price, rather than starting with a listing price and asking whether you can stretch to meet it. Enter your gross annual income, your down payment, the interest rate you expect to pay, your amortization period, and your existing monthly debts, and the tool applies the same debt service ratios that lenders use when they decide how much to approve you for.

Two ratios drive the result. The Gross Debt Service ratio, or GDS, looks only at housing costs, your mortgage payment, property taxes, heating, and half of any condo fees, measured against your gross monthly income. The Total Debt Service ratio, or TDS, adds every other debt payment you carry, car loans, student loans, credit card minimums, on top of that housing figure. Whichever ratio hits its limit first becomes the ceiling on how much home you can afford, even if the other ratio still has room to spare.

Selecting a country changes which limits apply. Canada uses 39 percent for GDS and 44 percent for TDS. The USA applies comparable front-end and back-end ratio guidelines. The UK and Australia each use their own affordability multiples and serviceability checks. If your country is not listed, the Worldwide option applies a general 32 percent housing ratio and 44 percent total debt ratio, so you still get a usable estimate. Once the numbers are in, the calculator shows your maximum affordable home price, your projected monthly mortgage payment, both ratios plotted against their limits, and a full monthly payment breakdown.

Frequently Asked Questions

How much house can I actually afford?

A common rule of thumb puts your home price at roughly 4 to 5 times your gross annual household income, assuming a typical down payment. The more precise answer depends on your interest rate, your existing debts, and local property taxes, which is exactly what this calculator factors in. It applies the same ratios a lender will use, so the number you see here should line up closely with what you would hear in a real mortgage conversation.

What is the difference between GDS and TDS?

GDS, the Gross Debt Service ratio, covers only your housing costs, your mortgage payment, property taxes, heating, and half of any condo or strata fees, measured against your gross monthly income. TDS, the Total Debt Service ratio, takes that same housing figure and adds every other monthly debt payment on top of it. Lenders lean on TDS as the final check since it reflects your whole financial picture, so a high TDS can limit your borrowing even when your housing costs alone look manageable.

Does a bigger down payment mean I can afford a more expensive home?

Generally, yes, and in two ways. A larger down payment shrinks the loan amount, which lowers your monthly payment and your GDS ratio at the same time. In Canada, it can also reduce or eliminate the mortgage default insurance premium required once a down payment falls below 20 percent of the purchase price. Running a few different down payment amounts through this calculator is a quick way to see how much extra saving actually moves your maximum price.

Can I use this calculator outside Canada, USA, UK, or Australia?

Yes. Choose the Worldwide option and enter your own interest rate. The calculator falls back to standard affordability ratios of 32 percent for housing costs and 44 percent for total debts, giving you a reasonable estimate regardless of where you are buying. Your local bank or central bank publications are usually the fastest way to find the current mortgage rate for your country.

Does this calculator guarantee mortgage approval?

No. This tool estimates affordability using the same debt ratio math lenders rely on, but actual approval also depends on your credit history, employment status, the specific lender’s policies, and in some countries a mandatory stress test rate that is higher than your contract rate. Treat the result as a planning figure to bring into a conversation with a mortgage broker or lender, not as a preapproval.

What You Need to Know

This calculator gives you a solid starting estimate, but a real mortgage application looks at more than income, debts, and a down payment. Your credit score and history play a major role in both approval and the rate you are offered, and a lower score can mean a higher rate even if your income and debt ratios look fine on paper. Many lenders also apply a stress test, qualifying you at a rate higher than your actual contract rate to make sure you could still manage payments if rates rise later, which this tool does not simulate. If your country uses a stress test, expect your real approved amount to come in somewhat lower than the figure shown here.

There is also an important difference between being pre-qualified and being pre-approved, and it catches a lot of first-time buyers off guard. A pre-qualification is a rough estimate based on the numbers you provide yourself, useful for early planning but not a commitment from anyone. A pre-approval means a lender has actually verified your documents and your credit report and given you a conditional commitment up to a set amount, which is what sellers and real estate agents will expect to see once you start making offers. Treat the result from this calculator as closer to a pre-qualification than a pre-approval.

The purchase price is also only one part of what buying a home costs. Below a 20 percent down payment, most lenders in Canada require mortgage default insurance, and most lenders in the US require private mortgage insurance, both of which add to your ongoing cost. On top of that, closing costs such as legal fees, land transfer tax or stamp duty depending on your country, home inspection fees, and title insurance typically add up to several thousand dollars that are due at closing rather than spread across your monthly payment. Moving costs and initial home insurance premiums are worth budgeting for separately as well, since neither is reflected in the numbers this calculator produces.

Property tax estimates entered here are also just that, estimates. Actual rates vary widely by municipality and can change the real monthly cost of homeownership more than people expect. If you are early in the home buying process and want a fuller picture of what to prepare before that first conversation with a lender, our guide on what first-time home buyers need to know before talking to a lender walks through documents to gather, how pre-qualification differs from pre-approval, and the full range of costs beyond the purchase price. From there, a formal preapproval from a lender or a conversation with a mortgage broker will give you numbers you can actually act on.

The figures produced by this calculator are estimates only, based on general affordability guidelines, and do not constitute mortgage preapproval or financial advice. Always consult a licensed mortgage broker, lender, or financial advisor before making decisions about buying a home or taking on a mortgage.