Overview
Multiplying your salary by 4.5 produces a neat house-hunting number. Unfortunately, a neat number is not the same as a mortgage decision.
Income multiples are useful for a first estimate, but the income a lender accepts and the payment it considers affordable can differ from your initial calculation. Your deposit and the property also remain separate constraints.
Quick Answer
There is no universal rule that every UK applicant can borrow exactly 4.5 times salary. Some cases support more, some less, and some do not meet the lender's criteria at all.
Loan-to-income is one measure within a wider assessment. Regulatory controls on high-income-multiple lending are not an individual entitlement to borrow a particular amount.
What the Multiple Measures
Loan-to-income divides the mortgage amount by the annual income used for the calculation.
A £180,000 mortgage against £40,000 of accepted annual income is 4.5 times income. A £210,000 mortgage against the same income is 5.25 times.
For joint applicants, the calculation may use accepted combined income. But “accepted” is the key word: salary, overtime, bonuses, self-employed earnings and other income may be assessed differently.
| Calculation | Result |
|---|---|
| £40,000 × 4 | £160,000 |
| £40,000 × 4.5 | £180,000 |
| £40,000 × 5 | £200,000 |
These are arithmetic examples, not lending offers.
Why the Regulatory Headline Is Easy to Misread
The Bank of England's framework addresses the amount of high loan-to-income lending across the mortgage market. Its 2026 consultation and interim measures concern how those controls apply to firms.
That is different from a law saying no household may borrow above 4.5 times income. It is also different from a rule requiring lenders to offer 4.5 times income to everyone below that level.
Implementation and lender product policies can change. A published high-multiple product may have specific income, loan-to-value or applicant criteria, and still require a full affordability assessment.
Start With the Right Income Figure
For an employee, ask whether the lender uses basic salary alone or includes particular variable income. Keep the evidence period consistent with what it requests.
For a sole trader, turnover is not the same as profit available to support borrowing. For a company director, the treatment of salary, dividends and retained profit can depend on lender criteria.
Suppose a business invoices £90,000 but has £45,000 of costs. Multiplying the turnover by 4.5 ignores half the business's economic picture before tax and personal commitments are considered.
Use our self-employed mortgage guide and accountant's certificate guide to prepare the relevant evidence.
Why Identical Salaries Can Produce Different Offers
Two households earning £50,000 can have very different outgoings. Childcare, car finance, credit commitments and the number of dependants can materially change the money available for housing.
The term also affects the monthly repayment. A longer term lowers the payment for the same loan and rate, but increases the period over which interest is charged and may raise retirement-income questions.
Our mortgage term and total-cost guide demonstrates that trade-off. Do not extend the term simply to reach the largest headline loan without checking the long-term cost.
Deposit and LTV Are a Separate Test
Suppose your income supports a £200,000 loan but you have a £10,000 deposit. That does not automatically mean every £210,000 property is suitable or that purchase costs are covered.
The lender will assess the loan relative to its accepted property value. You also need funds for relevant tax, legal work and other costs.
Conversely, a large deposit does not automatically make a monthly payment affordable. Read loan-to-value explained to keep these two calculations separate.
Turn the Estimate Into a Useful Budget
Prepare three numbers: the lender's possible maximum, the amount needed for the intended purchase, and the payment you can comfortably sustain.
Stress-test your own household budget with plausible changes in costs or income. That exercise is not a substitute for the lender's assessment, but it can reveal whether the maximum would leave you with no room for repairs or unexpected bills.
Ask for an illustration showing the rate, fees, term and repayment type. A borrowing estimate without those assumptions is incomplete.
Frequently Asked Questions
See our mortgage guides. Your home may be repossessed if you do not keep up repayments on your mortgage. Examples are illustrative and do not constitute personalised advice.
