Most people are given a rough figure — "about 4–4.5× your salary" — and left to do the maths. But the real answer is more nuanced. Lenders look at your income, outgoings, credit history, deposit size, and stress-test you against future rate rises. Here's exactly how it works.
This guide is for information only and does not constitute personal financial advice. Your home may be repossessed if you do not keep up repayments on your mortgage.
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Every lender starts with an income multiple — typically 4 to 5.5 times your gross annual income. This is the ceiling, not a guarantee. Your actual offer will be refined by the affordability checks below.
| Annual income | 4× multiple | 4.5× multiple | 5× multiple |
|---|---|---|---|
| £25,000 | £100,000 | £112,500 | £125,000 |
| £35,000 | £140,000 | £157,500 | £175,000 |
| £50,000 | £200,000 | £225,000 | £250,000 |
| £65,000 | £260,000 | £292,500 | £325,000 |
| £80,000 | £320,000 | £360,000 | £400,000 |
| £50,000 + £40,000 | £360,000 | £405,000 | £450,000 |
Last row shows a joint application example. Figures are illustrative only and do not account for affordability or stress testing.
The final column (5× multiple) is typically only available through specialist lenders or professional mortgage schemes — for example, for doctors, solicitors, accountants, or higher earners above £75,000. A whole-of-market broker can access these where a high-street bank cannot.
Since the Mortgage Market Review in 2014, lenders have been required to go further than just income multiples. They conduct a detailed affordability assessment covering three areas:
Lenders verify your income against payslips, P60s, and bank statements. They treat different income types differently:
Your monthly outgoings are deducted from your disposable income before the lender works out what you can afford. Key items include:
Lenders are required to check you could still afford your mortgage if interest rates rose sharply — typically stress testing at 6–8% regardless of the actual deal rate. This is why someone on £50,000 might be offered £180,000 instead of the theoretical £225,000 (4.5×) their income multiple would suggest. If your outgoings are high, the stress test tightens further.
There are four practical levers that can meaningfully increase what you're offered — without taking on inappropriate risk.
Pay off or close credit cards and loans before applying. Each £1,000 of monthly commitment reduces your affordability significantly.
A cleaner credit file opens more lenders and higher income multiples. Even 3–6 months of improvement makes a real difference.
Adding a second applicant — partner, family member — combines income. Even a modest second income can push you into the next price bracket.
Lower LTV unlocks better rates and can pass the affordability stress test more easily, even if the headline multiple stays the same.
Illustrative scenario only
Applicant
Single applicant, employed
Basic salary
£42,000
Regular bonus (50% used)
+£4,000
Total assessed income
£46,000
At 4× multiple
£184,000
At 4.5× (typical)
£207,000
At 5× (specialist)
£230,000
Final offer subject to affordability assessment, stress test, credit check, and property valuation. Figures are illustrative.