Guide · Mortgages & Property
How Much Can I Borrow for a Mortgage in the UK?
Income multiples, affordability stress tests, and what lenders actually look at — with worked examples for different salary levels.
The income multiple rule of thumb
The starting point for most UK mortgage applications is the income multiple — the number your gross annual salary is multiplied by to arrive at the maximum loan. The majority of high-street lenders work at 4× to 4.5× your income. Joint applications combine both salaries before applying the multiple.
At 4.5× income, a single applicant earning £40,000 could borrow up to £180,000. The same couple each earning £40,000 (£80,000 combined) could borrow up to £360,000. Some lenders offer higher multiples — up to 5.5× — for higher earners, key workers, or professionals such as doctors and lawyers.
Based on a 4.5× income multiple. Actual offers depend on outgoings, credit score, and the lender's affordability model.
The stress test: the real constraint
Since 2014, lenders must satisfy the Prudential Regulation Authority (PRA) stress test: they check that you could still afford the mortgage if rates rose by 3 percentage points above their standard variable rate (SVR). For many borrowers — especially those with higher incomes but significant outgoings — the stress test is a tighter constraint than the income multiple.
How the stress test works
If a lender's SVR is 7%, they test at 10%. On a £250,000 mortgage over 25 years at 10%, the monthly payment would be around £2,270 — the lender checks your income and outgoings can comfortably cover that, even if your actual initial rate is 4.5%.
What else affects how much you can borrow?
Income multiples and stress tests give you a ceiling. These factors move the number up or down in practice:
- Deposit size. A larger deposit improves your loan-to-value (LTV), unlocks lower rates, and helps pass affordability checks because the monthly payment is lower. Below 10% deposit, choice shrinks significantly.
- Monthly commitments. Car finance, credit card minimum payments, and other loans are deducted from your disposable income before the affordability calculation runs. A £400/month car PCP can reduce your mortgage offer by £30,000 or more.
- Credit score. A clean credit history doesn't raise your maximum, but adverse marks (missed payments, defaults, CCJs) can reduce what lenders will offer or rule out the cheapest rates entirely.
- Number of dependants. Each child increases a lender's estimate of your household expenditure, reducing what they'll lend.
- Type of income. Bonuses, overtime, and self-employed profit are often discounted or require two to three years of history before they count in full.
Worked example: £55,000 salary, £40,000 deposit
At a 4.5× multiple, a £55,000 salary suggests a maximum loan of £247,500. Adding a £40,000 deposit gives a purchase price of up to £287,500 and an LTV of 86% — which puts you in competitive rate territory (most lenders price well from 85% LTV and below). On a 25-year repayment mortgage at 4.5%, the monthly payment would be around £1,375. Run the stress test at 7.5% and it rises to about £1,750 — still comfortably within reach for a £55,000 salary.
Frequently asked questions
What income multiple do UK lenders use?
Most high-street lenders offer 4× to 4.5× your gross annual income. Some specialist lenders will stretch to 5× or 5.5× for higher earners (typically above £75,000) or professionals in certain fields. Joint applications combine both salaries before applying the multiple.
What is the PRA mortgage stress test?
Since 2014 the Prudential Regulation Authority requires lenders to check you can still afford the mortgage if interest rates rise by 3 percentage points above the lender's standard variable rate (SVR). This stress test — not your deposit — is often the binding constraint for higher earners.
Does a bigger deposit let me borrow more?
A larger deposit improves your loan-to-value (LTV) ratio, which unlocks better interest rates and increases the chance of being accepted, but it does not directly raise the income multiple a lender will offer. What it does do is lower your monthly payment, which can help you pass affordability checks.
Do lenders count bonus and self-employed income?
Most lenders will count 50%–100% of regular bonuses if you can show at least two years of history. Self-employed applicants typically need two to three years of accounts, and lenders usually use your net profit or salary-plus-dividends figure rather than revenue.