Use your own amounts and assumptions. The estimate uses your selected currency.
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The house price the 28% and 36% rules allow, the rent the 30% rule allows, and the salary you'd need for the place you actually want.
Use your own income, mortgage rate, tax and insurance costs. These percentages are planning assumptions, not local lending rules.
Adjust the inputs to explore different scenarios.
See what your numbers mean, then compare your options.
House you can afford on A$0/yr
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28% rule — housing costs only
Enter your starting numbers.
Gross annual salary (before tax) · Mortgage rate
Salary for your dream house
Flip it around: type the price of the house you actually want, and see the salary the 28% rule says you'd need — at the same down payment, rate and term above.
Salary you'd need
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The 28% rule (front-end ratio): spend no more than 28% of your gross monthly pay on housing. The 36% rule (back-end ratio): everything you owe each month — housing plus car payments, student loans, credit cards — should stay under 36% of gross pay, so existing debts eat into what's left for a mortgage. The 30% rule is the renting version: keep rent under 30% of gross pay. All three use pay before tax, which is why the numbers can feel generous next to what actually lands in your account.
The mortgage math is the standard amortization formula: monthly payment = P × r(1+r)n / ((1+r)n − 1), where P is the loan, r is the yearly rate divided by 12, and n is the number of months. We run it backwards — take the monthly payment the rule allows, solve for the biggest loan that fits, then divide by (1 − your down payment %) to get the house price. At a 0% rate the loan is simply split evenly across the term.
This is a rough estimate for orientation, not financial advice, and not a lending decision — a lender will also weigh your credit score, savings, and job history. Your numbers never leave your browser: nothing you type here is stored, sent, or tracked. Want to know what you're really spending each month before you commit to a payment? Deco tracks it automatically.