How Much House Can You Afford? A Practical Homebuyer's Budget Guide
One of the most common and costly mistakes homebuyers make is confusing how much they can borrow with how much they can afford. Lenders will often approve you for a mortgage significantly larger than your monthly budget can comfortably accommodate, because their models do not account for all the real costs of homeownership. Understanding the difference between maximum qualification and comfortable affordability is essential before you start shopping.
The Standard Affordability Guidelines
Financial advisors and mortgage professionals use several rules of thumb to frame housing affordability. The most commonly cited is the 28/36 rule: your housing costs — including principal, interest, property taxes, and insurance (PITI) — should not exceed 28% of your gross monthly income, and your total debt obligations (including the mortgage) should not exceed 36%. A more conservative benchmark is keeping total housing costs below 25% of take-home pay, which leaves more room for savings, investment, and the inevitable expenses that come with owning a home. Lenders may approve you at ratios above these thresholds, but that does not mean doing so is financially wise.
Account for All Ownership Costs
The mortgage payment is only the beginning of homeownership costs. Property taxes vary widely by location and can add hundreds or even thousands of dollars per month to your effective housing cost. Homeowners insurance is mandatory with a mortgage. If your down payment is below 20%, private mortgage insurance adds to your monthly payment until you reach the required equity threshold. Homeowner association fees in condos, townhomes, and planned communities can range from modest to substantial. And unlike renting, all maintenance and repair costs fall to you — budget 1% to 2% of the home's value annually for upkeep, knowing that some years will cost far more.
The Down Payment's Impact on Affordability
A larger down payment reduces your loan principal, which lowers both your monthly payment and the total interest you pay over the life of the loan. It can also eliminate PMI, qualifying you for better rates, and signals financial stability to lenders. Conversely, stretching too aggressively to maximise your down payment can leave you without liquid reserves for closing costs, moving expenses, and the repairs that almost always emerge in the first year of homeownership. Finding the right balance between down payment size and post-closing financial resilience is one of the most important affordability calculations you will make.
Build in a Comfortable Buffer
Buying at the absolute top of your qualifying range leaves no margin for life's inevitable surprises: job changes, medical expenses, economic downturns, or the unexpected $15,000 roof replacement that comes eighteen months after closing. Aim to buy a home where the payment feels manageable at roughly 80% of your maximum qualification, leaving the rest as a buffer. A home you can genuinely afford is not just one whose payments you can technically make — it is one that leaves your financial life intact and your long-term goals reachable.
Use our affordability calculator to run your numbers, or contact our mortgage advisors for a personalised budget review.