Maximum Purchase Price Calculator

What the Maximum Purchase Price Calculator does

Most affordability tools start from your income and work forward to a price. This one starts where house-hunting actually starts for a lot of buyers — with the down payment sitting in the bank — and works out the highest price that down payment and your income can jointly support.

It also fixes the single most common planning mistake in this process: closing costs come out of the same pool of cash as your down payment, not on top of it, and most calculators quietly ignore that. This one reserves an estimated closing-cost amount from your available cash before it runs the affordability math, so the number you get back is one you can actually close on.

• Your maximum purchase price, with closing costs reserved out of your down payment first
• Which constraint binds — your down payment or your income — and by how much
• A comfortable price at roughly 32% of income, alongside the true maximum at 39%
• The full deal summary at your maximum price: mortgage, land transfer tax, closing costs, ratios
• A levers table showing exactly what would raise your maximum price, and by how much

The key variables that move the answer — and how lenders treat them

Two separate ceilings apply here, and understanding which one is binding tells you exactly what to do next.

• Down payment — sets a hard price ceiling through the tiered minimum down payment rule, entirely independent of your income. This ceiling does not move no matter how much you earn.
• Closing costs — treated by lenders as a cash requirement separate from the down payment, but funded from the exact same account in practice. Reserving them first is what keeps this calculator's answer realistic instead of theoretical.
• Income and existing debts — set the second ceiling through the GDS and TDS ratios, run at the stress-test rate rather than your contract rate. Paying down revolving debt often raises this ceiling faster than an equivalent increase in salary would, because lenders count 3% of any credit card balance as a monthly obligation regardless of what you actually pay.
• City — changes your estimated property tax, which eats into the payment room your income supports, and in Toronto adds a second municipal land transfer tax on top of the provincial one, which changes how much cash closing actually requires.

How this is actually calculated

The calculator estimates closing costs at a representative price your down payment alone could support, then subtracts that estimate from your available down payment before running anything else. That reduced figure is the down payment actually used in every calculation that follows — this is the correction most affordability tools skip.

From there it runs the same affordability engine used elsewhere on this site twice: once at the standard 39% GDS / 44% TDS insured limits for your true maximum, and once at a 32% GDS limit for a more comfortable figure. Each run bisects on purchase price, testing candidate prices against both the tiered minimum down payment and the debt service ratios at the stress-test rate, until it finds the highest price that clears both.

The final answer is the lower of what your income supports and what your down payment supports — whichever one runs out first is reported as the binding constraint. The levers table reruns this same engine with one variable changed at a time — more down payment, less debt, a longer amortization, a co-applicant's income — so you can see in dollars exactly what each change is worth.

• Down payment used = down payment available − estimated closing costs
• Price by down payment: inverts the tiered minimum down payment rule
• Price by income: bisection against GDS ≤ 39% and TDS ≤ 44% at the stress-test rate
• Maximum price = MIN(price by down payment, price by income)

What you get, and how lenders use these numbers to qualify you

Every figure here maps onto what an underwriter actually checks, in the order they would check it.

• Maximum purchase price — the ceiling a lender would approve today, before rate holds or a specific lender's overlays are applied.
• Binding constraint — tells you exactly which lever to pull next: a larger down payment if that is what is limiting you, or paying down debt and adding income if it is not.
• Comfortable vs maximum — the responsible framing most calculators skip. Lenders will approve up to the maximum; whether you should spend up to it is a different question entirely.
• Full deal summary — every number a lawyer's Statement of Adjustments and a lender's commitment letter will eventually confirm, gathered in one place before you make an offer.

Using your results well

Shop under your maximum, not up to it — the comfortable figure exists for a reason, and the gap between the two numbers is worth sitting with before you start touring homes. Run the levers table against your actual situation: if a co-applicant or a debt payoff is realistic in the next few months, it may be worth waiting rather than stretching to the maximum today.

What this calculator deliberately does not do is guarantee an approval. It does not know your credit score, your employment history or a specific lender's overlays, and it uses a 1% property tax planning estimate rather than your exact municipality's current rate unless your city is listed above. Treat this as the number to shop under, and get a real pre-approval before you write an offer.

• Confirm your closing-cost estimate against the dedicated closing costs calculator once you have a real target price
• Compare the comfortable and maximum prices before deciding where to shop
• Check which lever — down payment, debt, amortization or a co-applicant — moves your number the most
• Get a real pre-approval before writing an offer near your maximum

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