UK Mortgage Affordability Calculator

How much can I afford to borrow?

Enter your gross annual income (single or joint), the deposit you have saved, your lender's income multiple and an illustrative interest rate and term. The calculator estimates your maximum borrowing, the highest property price you could reach, your loan-to-value and an indicative monthly repayment.

The income multiple rule

• Maximum borrowing = gross annual income × income multiple (commonly 4.5×).
• Maximum property price = maximum borrowing + deposit.
• Loan-to-value (LTV) = borrowing ÷ property price — a lower LTV usually means cheaper rates.

This is a guide based on income multiples, not a mortgage offer. Lenders also assess your spending, credit history and a stress-test rate. Speak to a mortgage adviser for a decision in principle.

Frequently Asked Questions

How much can I borrow for a mortgage?

Most UK lenders cap mortgage borrowing at around 4.5 times your gross annual income, though some go to 5× or higher for certain borrowers. The calculator multiplies your income by the chosen multiple to estimate your maximum loan.

How is the maximum property price worked out?

Maximum property price = maximum borrowing + your deposit. A larger deposit lets you buy a more expensive home for the same loan, and lowers your loan-to-value, which can unlock better rates.

Is the income multiple the only thing lenders check?

No. Lenders also run an affordability assessment on your income, regular outgoings, existing debts and the impact of higher interest rates. Your actual offer may be lower than the income multiple suggests.

Can I use joint income?

Yes. For a joint application, enter your combined gross annual income. Lenders typically apply the income multiple to the total, subject to the affordability check.

Does a bigger deposit help?

Yes. It increases the property price you can reach and reduces your loan-to-value. Crossing thresholds such as 90%, 85% or 75% LTV often gives access to noticeably cheaper mortgage rates.