How Much Can I Borrow on a $300,000 Salary? (2026)
On a $300,000 salary, a payment budget equal to 30% of gross income mathematically amortises approximately $1,224,552 at 6.2% over 30 years. The 30% input is a budgeting heuristic, not a lender serviceability or approval rule.
Using a 30%-of-gross-income budgeting heuristic, a $300,000 salary maps to approximately $1,224,552 at 6.2% over 30 years and $7,500 per month. This is not a lender approval estimate.
What mortgage can I afford on $300k?
Within this 30%-of-gross-income budget model, 6.2% maps to about $1,224,552 and $7,500 per month. At 5.5% the same payment budget mathematically amortises $1,320,913; lenders use a buffered assessment rate and broader inputs.
How do interest rates affect borrowing power on $300k?
Interest rates significantly impact how much you can borrow. On a $300,000 salary, borrowing power ranges from $1,022,126 at 8% down to $1,320,913 at 5.5%. Each 0.5% rate change shifts capacity by roughly $69,976.
Is the 30% rule accurate for mortgage affordability?
The 30% rule is a household budgeting heuristic, not an Australian lending standard and not necessarily conservative for every household. Lenders assess verified income, living expenses, debts, deposit and other policy criteria at a buffered rate. Use our full Borrowing Power Calculator to enter your own comfortable payment and the current APRA buffer.
Should I borrow the maximum on $300k?
Just because you can borrow $1,224,552 doesn't mean you should. Consider your lifestyle, other financial goals, potential rate increases, and whether you want a buffer. Borrowing 80% of your maximum provides a safety margin for rate rises.
Need a more personalised estimate?
Our Borrowing Power Calculator factors in your existing debts, living expenses, and dependants for a more accurate estimate.
