Free calculator · 2026
UK mortgage affordability calculator
How much could you borrow? This works it two ways (the lender's income multiple and what your outgoings comfortably support) and shows the realistic figure, which is the lower of the two. Nothing you type leaves your device.
Plan the whole purchase
Knowing the number is the start. The UK Annual Budget Planner brings your deposit, the buying costs and the year ahead into one offline plan.
How much can I borrow?
Lenders look at two things. First, an income multiple: most will lend up to about 4.5 times your income (combined, if you're buying together). Second, affordability: they check the monthly payment still fits your budget after your existing commitments, and that it would still fit if interest rates rose. The amount you can actually borrow is the lower of those two, which is why this calculator shows both and reconciles them. Most calculators only show the income multiple, which can flatter the figure.
The stress test here adds a few percentage points to the rate to check the payment still works if rates climb. The Bank of England dropped its fixed 3% stress rule in 2022, so treat this as your own safety buffer. These are 2026 conventions and an estimate to plan with, not a mortgage offer. A broker or lender will give you a decision in principle based on your full circumstances.
Read the full guide: how much can I borrow for a mortgage? →