How Much Can I Borrow for a Mortgage UK 2026?

How do lenders decide how much you can borrow?

UK lenders use a combination of income multiples and detailed affordability assessments to determine how much they will lend. The income multiple gives a rough ceiling, while the affordability assessment examines whether you can sustain repayments alongside other commitments.

Most UK lenders use 4 to 4.5 times your annual gross salary. Someone earning £40,000 could typically borrow £160,000 to £180,000. Some specialist lenders offer 5 to 5.5 times income for professionals such as doctors, solicitors, and accountants, or for larger deposits.

The income multiple is only a guide. The actual amount may be higher or lower depending on the affordability assessment, which examines your specific financial circumstances in detail.

Understanding affordability assessments

Since the Mortgage Market Review (MMR) rules introduced in 2014, all UK mortgage lenders must conduct thorough affordability assessments examining:

• Gross and net income: Salary, regular overtime, bonuses, commission, and other income
• Regular expenditure: Existing debt repayments, credit card minimums, car finance, student loans, childcare, and essential living expenses
• Stress testing: Lenders check you could afford repayments if rates rise 1–3 percentage points above the product rate
• Future changes: Approaching retirement, plans to start a family, or expected income changes

Two people earning the same salary can be offered very different mortgage amounts based on their individual financial circumstances.

Income types and how they are treated

• Basic salary: 100% used by virtually all lenders
• Overtime and shift allowances: Usually 50–100% if regular with 6–12 months' history
• Bonuses and commission: Typically 50–60% of the average over 2–3 years
• Self-employed income: Average of last 2–3 years' profits or salary plus dividends
• Rental income: Counted at 50–75% of gross rental receipts
• Benefits: Child benefit and tax credits accepted by many lenders

How your deposit affects borrowing

Key loan-to-value (LTV) thresholds:

• 95% LTV (5% deposit): Maximum borrowing, but highest rates and strictest criteria
• 90% LTV (10% deposit): Significantly better rates, more lender choice
• 85% LTV (15% deposit): Further rate improvement, some lenders offer higher income multiples
• 75% LTV (25% deposit): Where the best rates typically start
• 60% LTV (40% deposit): The very best rates, maximum lender flexibility

At 90% LTV a lender might offer 4.5 times income, but at 75% LTV the same lender might stretch to 5 times. Combined with a lower rate, this significantly increases buying power.

Practical ways to increase your borrowing

• Pay down debts: Clearing credit cards, car finance, or personal loans removes them from the affordability assessment
• Close unused credit facilities: Even zero-balance overdrafts and credit cards can reduce borrowing capacity
• Increase your deposit: Even a small increase can move you to a better LTV band
• Use a broker: Different lenders calculate affordability differently
• Consider a longer term: A 35-year mortgage reduces monthly repayments, passing affordability tests more easily
• Joint applications: Combined income can significantly increase borrowing

Using online mortgage calculators

Online calculators are useful starting points but have significant limitations. Most use a simple income multiple without accounting for your specific debts, spending, or stress testing. A calculator might suggest £200,000 on a £45,000 salary, but after accounting for car payments, credit card minimums, and student loans, the actual offer might be £160,000.

Get expert help with your mortgage

Understanding how much you can borrow is the essential first step. A mortgage broker can search the whole market, identify which lenders will be most generous for your circumstances, and help you present the strongest application. Nesto matches you with experienced mortgage brokers who can maximise your borrowing power.