Answers · UK 2025/26

How big a mortgage can I get on a £20,000 salary?

Typically around £90,000, based on the common 4.5x income cap (4.5 x £20,000). Some lenders stretch to 5x (£100,000) or more, but affordability checks on outgoings, especially at this income level, can pull the figure down significantly.

Last updated: 9 July 2026Last reviewed: 9 July 2026How we verify

Full answer

Most UK mortgage lenders cap borrowing at roughly 4 to 4.5 times gross annual income, so on a £20,000 salary you can usually borrow about £80,000 to £90,000. Some lenders offer 5x or 5.5x for borrowers with a clean credit history and manageable existing commitments, potentially reaching £100,000 to £110,000, but the income multiple is only a starting point -- lenders run an affordability assessment that deducts other loans, credit card balances, childcare and a stress-tested higher interest rate before confirming how much they will lend, and at lower income levels even modest existing commitments can significantly reduce the amount on offer. Worked example: borrowing £90,000 over 25 years at 5.0% costs about £526.13 a month. On a £20,000 salary your take-home pay for 2026/27 is roughly £1,493.30 a month after Income Tax (£1,486.00 a year) and National Insurance (£594.40 a year), so that payment is around 35.23% of net income -- within the range many lenders consider comfortable, though a mortgage this size buys a limited range of properties in most of the UK, and a bigger deposit or joint application with a second income is usually needed to reach a typical property price.