Mortgage Affordability Calculator
See how much you can borrow at 4×, 4.5×, 5× and 5.5× of your household income, the monthly repayment at your chosen rate, and how the PRA stress test affects what lenders will offer.
Leave at £0 for a sole application
Car finance, personal loans, credit card minimums
Stress test
At 7.5% (rate + 3% PRA requirement), monthly repayments on the 4.5× loan would be £1,662.73. Lenders must satisfy themselves you can afford this.
Income multiple comparison
| Multiple | Max loan | Max property | Monthly repayment | Debt-to-income |
|---|---|---|---|---|
| 4× income | £200,000 | £250,000 | £1,111.66 | 27% |
| 4.5× income | £225,000 | £275,000 | £1,250.62 | 30% |
| 5× income | £250,000 | £300,000 | £1,389.58 | 33% |
| 5.5× income | £275,000 | £325,000 | £1,528.54 | 37% |
The FCA's loan-to-income limit means most lenders restrict lending above 4.5× income to no more than 15% of new mortgages. Some specialist lenders offer 5.0–5.5× for professionals or high earners. Debt-to-income includes existing monthly commitments.
Frequently asked questions
How many times my salary can I borrow?
Most lenders will lend up to 4.5× household income, which is the FCA's soft limit. On a £50,000 income with a £50,000 deposit, that means a maximum loan of £225,000 and a purchase price of up to £275,000. Some lenders — particularly for professionals or those earning above £75,000 — will stretch to 5.0× or 5.5×, but only a capped 15% of new mortgages can exceed 4.5×.
What is the PRA stress test?
The Prudential Regulation Authority (PRA) requires lenders to check that borrowers can still afford repayments if the interest rate rises by 3 percentage points above the reversion rate. At 4.5%, the stress rate is 7.5%. At that rate, monthly repayments on the £225,000 loan would be £1,662.73. Lenders must satisfy themselves you could manage this.
Do existing debts affect how much I can borrow?
Yes. Lenders assess your total monthly commitments — mortgage repayments plus existing car finance, personal loans, and credit card minimums — against your income. A high debt-to-income ratio will reduce what you are offered, or require you to clear debts before applying. Adding existing debt payments to this calculator will reflect this in the debt-to-income figures.
Is this a guaranteed amount a lender will offer me?
No. This calculator shows what income multiples imply — lenders also assess your credit score, employment type, deposit size, property type, and full expenditure. The figures shown are useful for planning and property searches, but always get an Agreement in Principle from a lender or mortgage broker before making an offer.