Property & Mortgages · 2026/27
UK Mortgage Affordability Guide 2026/27: How Much Can You Borrow?
How much you can borrow for a UK mortgage is not a simple multiple of your salary. Lenders combine income multiples, a detailed look at your outgoings, the size of your deposit, and an affordability stress test that checks whether you could still pay if rates rose. This 2026/27 guide explains exactly how each part works, with worked examples, so you can estimate your realistic borrowing power before you apply.
The starting point: income multiples
The headline figure most people focus on is the income multiple. The majority of UK lenders cap borrowing at roughly 4 to 4.5 times gross annual income. Some lenders offer up to 5 or even 5.5 times for higher earners, certain professionals (such as doctors, lawyers and accountants), or specific high loan-to-value schemes, but these are exceptions rather than the rule.
Income multiples are applied to gross (pre-tax) income. For employed applicants this is typically basic salary, often plus a proportion of regular bonus, overtime or commission. For two applicants, most lenders combine both incomes.
| Gross income | 4x | 4.5x | 5x |
|---|---|---|---|
| 30,000 pounds | 120,000 pounds | 135,000 pounds | 150,000 pounds |
| 40,000 pounds | 160,000 pounds | 180,000 pounds | 200,000 pounds |
| 60,000 pounds (joint) | 240,000 pounds | 270,000 pounds | 300,000 pounds |
These figures are illustrative maximums. The income multiple is a ceiling, not a guarantee: your actual offer can be lower once outgoings and the stress test are applied.
The affordability stress test
Beyond income multiples, every lender runs an affordability assessment. Rather than just checking that you can afford payments at today's rate, the lender applies a higher stressed interest rate to make sure you could still cope if rates rose. The exact stressed rate is set by each lender (the rules and margins vary between lenders and are not a single fixed government figure), and is applied alongside your committed outgoings.
In practice the lender models your monthly payment at the stressed rate, subtracts your regular outgoings, and checks there is enough income left over. If there is not, the loan offered is reduced until the figures balance, or the application is declined.
This is why two people with identical salaries can be offered very different amounts: someone with car finance, credit card balances and childcare costs has far less surplus income than someone with none.
How deposit and LTV affect borrowing
Loan-to-value (LTV) is the size of the loan as a percentage of the property value. If you buy a 250,000 pound home with a 50,000 pound deposit, you borrow 200,000 pounds, which is an 80% LTV. Lenders price mortgages in LTV bands, and lower LTV almost always means a lower interest rate.
A lower interest rate reduces your monthly payment, which improves payment-based affordability, so a bigger deposit can indirectly let you stretch a little further. However, the income multiple cap still applies regardless of deposit size. The LTV bands and the rates within them are illustrative and change frequently, so always check current rates.
| Deposit | LTV | Typical rate impact |
|---|---|---|
| 5% | 95% | Highest rates, fewer products |
| 10% | 90% | Better choice and rates |
| 25% | 75% | Strong rates |
| 40% | 60% | Best available rates |
Worked example: a couple buying together
Sam and Priya have a combined gross income of 70,000 pounds (45,000 pounds and 25,000 pounds). They have a 45,000 pound deposit and want to buy a 300,000 pound home, borrowing 255,000 pounds (85% LTV).
- Income multiple check: at 4.5x, 70,000 pounds supports up to 315,000 pounds, so 255,000 pounds is comfortably within the cap.
- Outgoings: they have a 250 pound per month car finance payment and 150 pound per month in other credit commitments. The lender deducts these from disposable income.
- Stress test: the lender models the 255,000 pound loan at its stressed rate. With their outgoings, there is enough surplus income, so the loan passes.
If they cleared the car finance before applying, their surplus income would rise, which could either increase their maximum or simply strengthen the application. This shows how reducing commitments, not just earning more, improves borrowing power.
Affordability for the self-employed
Self-employed applicants face the same affordability rules but provide different evidence of income. Lenders typically average the last two or three years of accounts or SA302 tax calculations. Sole traders are usually assessed on net profit; limited company directors on salary plus dividends, though some lenders consider retained profit.
Because self-employed income can vary year to year, lenders often take the lower of a recent year or an average, which can reduce the assessed figure. Clean, consistent accounts and a broker who knows self-employed-friendly lenders make a real difference here.
Common mistakes that reduce borrowing power
- Applying for new credit before the mortgage - a new car loan or credit card shortly before applying can cut your maximum significantly.
- Carrying high credit card balances - even if you pay them off monthly, the committed minimum payment can be counted.
- Ignoring the stress test - assuming the income multiple is what you will get, then being surprised by a lower offer.
- Not being on the electoral roll - this weakens your credit profile and can affect the rate offered.
- Relying on a single lender - affordability models vary widely, so one lender declining does not mean all will.
- Overlooking regular committed costs - childcare, school fees and maintenance payments all reduce disposable income.