How Much Mortgage Can I Afford in the UK?
How much mortgage can I afford UK? Start with the income multiple — most lenders cap lending at around 4 to 4.5 times your annual income — then subtract everything that makes you riskier in their eyes: existing debts, childcare costs, a thin credit file and a small deposit. The multiple gives you the ceiling; the affordability assessment decides how close to it you actually get.
The multiple: a ceiling, not an offer
The multiple is the fastest way to size a purchase. At 4.5 times income, a £30,000 salary supports about £135,000 of borrowing, £50,000 supports £225,000, and a joint £80,000 supports £360,000. Add your deposit and you have a rough maximum price: £225,000 borrowed plus a £25,000 deposit buys a £250,000 home. But no lender lends on the multiple alone, and none of this is a lending decision — it is an explainer to help you shortlist homes worth viewing, not a promise of an offer. Once you have a loan size in mind, run the payments through the mortgage calculator to see what that loan actually costs each month at an illustrative rate.
What pulls the figure down
Three things shrink the offer most often. First, committed outgoings: car finance, credit-card minimums and childcare are deducted from the income available for a mortgage, so £500 a month of existing commitments can cut borrowing by tens of thousands. Second, the stress test: a loan that is affordable at an illustrative 4.5% may fail when the lender re-tests it at 8%, and the offer falls to whatever passes the higher rate. Third, the deposit and the property itself: a 5% deposit limits you to high-LTV products with stricter criteria, and a property the valuer down-values reduces the loan regardless of your income.
How to raise the number honestly
The levers that actually work are unglamorous: clear expensive debts before applying, save a larger deposit to drop into a cheaper LTV band, fix a thin credit file by registering to vote and keeping utilisation low, and apply jointly where a partner's income is real and provable. What does not work is inflating income or hiding commitments — lenders verify through payslips, bank statements and credit searches, and a declined application leaves a footprint that makes the next one harder. If the multiple says £180,000 and the homes you want cost £250,000, the honest answers are a bigger deposit, a cheaper area, or more time saving — not a lender who will bend the multiple.
Frequently asked questions
How much mortgage can I afford on my salary?
As a rough starting point, multiply your annual income by 4 to 4.5 — the range many UK lenders use as a cap. A £40,000 salary points to roughly £160,000–£180,000; a joint £70,000 income to roughly £280,000–£315,000. Lenders then adjust down for debts, childcare, credit history and the rate they stress-test you at, so the multiple is a ceiling, not a promise.
Do lenders use single or joint income?
Joint income where two people apply together — usually the combined salary, sometimes with the second income counted at a lower multiple. Some lenders also count reliable bonuses, overtime or commission, but often only a proportion of it, and only with a track record.
Does my deposit change how much I can borrow?
Indirectly, yes. A bigger deposit does not raise the income multiple, but it lowers the loan-to-value ratio, which unlocks cheaper rates and more lenders willing to lend at the top multiple. A 10% deposit on a £250,000 home means a £225,000 loan; a 25% deposit means £187,500 — and a much easier affordability test.
What is a mortgage stress test?
Lenders check you could still pay if rates rose — typically by testing your payments at a rate above the one you will actually pay (the lender's “stressed” rate, often linked to its standard variable rate plus a margin). Passing at 4.5% but failing at 8% can cut the amount offered, even if the headline monthly payment looks comfortable.
Can I borrow more than 4.5 times my income?
Sometimes. Some lenders go to 5 or 5.5 times income for high earners or certain professions, and the Bank of England's flow limit lets lenders put only a capped share of new lending above 4.5 times income — which is why higher multiples are rationed, not routine. Anything above 4.5 times should be treated as the exception, not the plan.