How much could you borrow?
Most UK lenders offer between 4 and 5.5× your income. Here's a realistic estimate plus a sanity check on whether the monthly payments would actually be comfortable.
Your details
Don't include rent, food or utilities — lenders mainly care about credit commitments and childcare.
Use a slightly high rate to stress-test.
A rough rule of thumb: monthly mortgage payments under 35% of net income (after your other outgoings) are sustainable. Your safe limit looks like roughly £145.00/mo.
A quick reality check
- • Lenders also stress-test at higher rates (often 6–8%) to make sure you'd cope.
- • Your credit history, age and existing debts all affect the actual offer.
- • Most banks want a deposit of at least 5% — 10% or more unlocks better rates.
- • A larger deposit means lower monthly payments and less interest paid overall.
How UK mortgage affordability works
When you apply for a mortgage in the UK, lenders typically offer between 4 and 5.5 times your gross annual household income. A couple earning £45,000 and £30,000 respectively could borrow up to around £337,500 at a 4.5x multiple. However, affordability isn't just about the headline number — lenders run detailed assessments of your outgoings, existing debts and living costs before deciding how much they're willing to lend.
The stress test explained
Beyond the income multiple, lenders apply a "stress test": they check whether you could still afford the payments if interest rates rose to 6–8%. This is why you might get offered less than you expected — even if today's rate looks manageable, the bank needs to be confident you'd cope if rates climbed. Since the Bank of England removed its formal affordability test recommendation in 2022, individual lenders set their own stress rates, but most still test at 2–3 percentage points above their current rate. Our calculator lets you adjust the stress rate to see how it affects the numbers.
What lenders actually look at
Your income multiple is only the starting point. Lenders will closely examine your monthly outgoings, including credit card payments, personal loans, car finance, student loan repayments and childcare costs. They'll also consider your spending habits through bank statements — typically the last three to six months. Regular gambling transactions, overdraft usage and a high number of active credit accounts can all reduce the amount you're offered, even if the numbers technically add up.
Your deposit and loan-to-value ratio
The size of your deposit directly affects both how much you can borrow and the interest rate you'll be offered. Lenders express this as the Loan-to-Value (LTV) ratio — a 10% deposit on a £250,000 property means a 90% LTV. The best rates are typically reserved for borrowers with 40% or more equity (60% LTV), while first-time buyers with a 5% deposit will pay a premium. Each 5% step in deposit size generally unlocks a better rate tier, so saving a little extra before buying can pay off substantially over the full mortgage term.
Joint applications and sole borrowers
Applying with a partner roughly doubles your borrowing power because lenders combine both incomes for the multiple calculation. Some lenders offer "joint borrower, sole proprietor" mortgages, where a family member's income helps you qualify but they don't go on the property deeds. If you're buying alone, keep in mind that single-income applications are held to the same stress-test standards, so the comfortable payment threshold matters even more.
Once you know what you can borrow, use our Repayment Calculator to see exactly what your monthly payments would look like, check what stamp duty you'd pay on your target property, or explore how overpayments could shorten your term.