How Much Can I Borrow for a Mortgage in the UK?
"How much can I borrow for a mortgage?" is the first question every UK buyer asks. This guide explains how lenders decide your maximum mortgage, the income multiples they use, and how deposit, debts and interest rates affect what you can afford.
Before you fall in love with a property, there's one number you need: how much can I borrow for a mortgage? In the UK, your maximum mortgage isn't a fixed figure — it depends on your income, your deposit, your existing debts and the lender's own affordability rules. This guide explains exactly how lenders decide, with worked examples so you can estimate your own borrowing power.
Once you have a target figure, our UK Mortgage Calculator shows the monthly repayments on any loan amount. But first, let's work out how much you can borrow in the first place.
How much can I borrow for a mortgage? The income multiple rule
The starting point for most UK lenders is an income multiple. Traditionally, lenders offer around 4 to 4.5 times your annual income. Some will stretch to 5 or even 5.5 times for higher earners or certain professions, but 4.5x is a sensible planning figure.
For a single applicant earning £40,000, that means a typical maximum mortgage of:
- 4 × £40,000 = £160,000
- 4.5 × £40,000 = £180,000
For a couple with a joint income of £70,000, the range would be roughly £280,000 to £315,000. These are starting points — the final figure depends on affordability checks.
Why affordability matters more than the multiple
Since stricter rules were introduced, lenders don't just multiply your salary — they run a full affordability assessment. They look at your take-home pay and subtract your regular commitments to see what's genuinely left over for a mortgage. This is why knowing your true net pay matters; our guide on how to calculate your UK take-home pay shows how to work it out.
Things that reduce how much you can borrow include:
- Existing debts — car finance, personal loans, credit card balances and student loan repayments.
- Childcare and dependants — regular committed costs.
- Credit card limits — some lenders count a percentage of your available limit even if unused.
How your deposit changes what you can borrow
Your deposit determines your loan-to-value (LTV) ratio — the size of the mortgage compared to the property price. A bigger deposit means a lower LTV, which unlocks better interest rates and can increase how much lenders are willing to offer.
For example, on a £250,000 home:
- A 10% deposit (£25,000) means a £225,000 mortgage at 90% LTV.
- A 20% deposit (£50,000) means a £200,000 mortgage at 80% LTV — usually at a noticeably lower interest rate.
Worked example: monthly repayments
Suppose you can borrow £180,000 over 25 years. At an interest rate of 5%, the monthly repayment would be roughly £1,052. At 4.5%, it drops to about £1,000. Even half a percent makes a real difference over 25 years — which is why comparing rates and overpaying when you can matters. You can test different rates and terms in our UK Mortgage Calculator.
How interest rates affect your borrowing
When interest rates rise, affordability tightens because the same loan costs more each month. Lenders also "stress test" your application against a higher rate than the one you're offered, to check you could still afford repayments if rates climbed. This means the borrowing figure you're quoted already has a safety margin built in.
Frequently asked questions
How much can I borrow for a mortgage on a £30,000 salary?
At a typical 4.5 times income multiple, around £135,000. The exact figure depends on your deposit, existing debts and the lender's affordability assessment. A joint application would increase this considerably.
What income multiple do UK mortgage lenders use?
Most lenders offer around 4 to 4.5 times your annual income, with some stretching to 5 or 5.5 times for higher earners or certain professions. Affordability checks then refine the final amount.
Does a bigger deposit mean I can borrow more?
A bigger deposit lowers your loan-to-value ratio, which unlocks better interest rates and can make lenders more willing to lend. It reduces the mortgage you need rather than the multiple, but improves affordability overall.
Do my debts affect how much I can borrow?
Yes. Lenders subtract regular commitments — loans, car finance, credit cards and childcare — from your income when assessing affordability. Clearing debts before applying can increase your maximum mortgage.
How much deposit do I need for a UK mortgage?
The minimum is usually 5% of the property price, but 10–20% is more common and gives access to better rates. A larger deposit lowers your monthly repayments and total interest paid.
This article was last reviewed in 2026. Figures are illustrative for guidance only — mortgage decisions depend on individual circumstances. Always speak to a qualified mortgage adviser.