Enter your details and click Calculate Affordability to see your estimated borrowing.
For guidance only. Lenders vary. Always verify borrowing capacity with a qualified mortgage adviser.
How Mortgage Affordability Is Calculated in 2026
Mortgage affordability determines how much a lender will let you borrow. UK lenders use two key tests: an income multiple (typically 4–4.5x your annual salary) and a stress test that checks you can still afford payments if interest rates rise by 3% above the revert rate. Both tests must be passed.
Your monthly outgoings — including credit card minimums, car finance, student loans, childcare, and regular subscriptions — are deducted from your income before the calculation. This is why two people on the same salary can be offered very different mortgage amounts.
Income Multiples by Lender Type (2026)
| Lender Type | Typical Multiple | Max Borrowing (£50k salary) | Notes |
|---|---|---|---|
| High street banks | 4–4.5x | £200k–£225k | Standard for most applicants |
| Building societies | 4–5x | £200k–£250k | Some offer higher multiples for professionals |
| Professional mortgages | 5–5.5x | £250k–£275k | Doctors, lawyers, accountants, vets |
| Joint applicants | 4–4.5x combined | Varies | Both incomes assessed; highest earner weighted |
| Buy-to-let | Rental coverage 125%+ | Based on rental income | Different criteria; not salary-based |
Multiples are guidelines. Actual offers depend on credit score, deposit size, employment type, and existing debt. Self-employed applicants typically need 2–3 years of accounts.
What Changed in 2026
In June 2023, the Bank of England withdrew the loan-to-income (LTI) flow limit that previously capped the proportion of mortgages a lender could issue at 4.5x+ income. However, most lenders have retained similar internal limits. The stress test remains the binding constraint for most borrowers.
With the Bank of England base rate at 4.5% (as of early 2026), mortgage rates remain elevated compared to the 2021 lows. Lenders stress-test at approximately 7–8%, which significantly reduces maximum borrowing compared to the sub-2% rate era. A £50,000 earner who could borrow £250,000 in 2021 may now be limited to £200,000–£215,000.
First-time buyers should also factor in the reduced SDLT relief threshold (£300,000 down from £425,000) when calculating total purchase affordability, as stamp duty is an additional upfront cost that cannot be added to the mortgage.
Complete Your Affordability Picture
Knowing how much you can borrow is the first step. Use these tools to plan the full purchase:
- Mortgage Calculator — once you know your borrowing limit, estimate monthly repayments and total interest over 25–35 years.
- Stamp Duty Calculator — calculate the SDLT you owe on top of your mortgage and deposit. This cash must come from savings, not borrowing.
- Deposit Calculator — work out how much deposit you need and how long to save, based on your target property price and LTV tier.
- LTV Calculator — see how your deposit size affects your LTV ratio and which mortgage rate bands you qualify for.
- Moving Costs Calculator — budget for all upfront costs beyond the deposit: solicitor fees, surveys, removals, and more.
✅ Lending criteria verified against FCA and Bank of England guidance, March 2026. This calculator is for guidance only. Speak to a qualified mortgage adviser for a personalised affordability assessment.
Worked Examples
Example 1 — £35,000 Single Income
Annual salary: £35,000
Multiplier: 4.5× = £157,500
Monthly payment (4.5%, 25yr): £876
Max borrowing: £157,500
Example 2 — £80,000 Joint Income
Combined salary: £80,000
Multiplier: 4.5× = £360,000
Monthly payment (4.5%, 25yr): £2,003
Max borrowing: £360,000
Example 3 — £55,000 with £500/mo Commitments
Salary: £55,000 — debts: £500/mo
Lender may reduce by £500 × 12 × 4 = £24,000
Adjusted max: £247,500 – £24,000
Effective max: £223,500
Common Mistakes to Avoid When Assessing Mortgage Affordability
- Only using base salary. Many borrowers forget to include bonuses, overtime, commission or freelance income. Most lenders will accept regular additional income at 50–100% of its value, which can meaningfully increase your borrowing power.
- Ignoring existing debt commitments. Credit cards, car finance, student loans and buy-now-pay-later agreements all reduce the amount a lender will offer. Paying off a £200/month car loan before applying could add £9,600–£10,800 to your maximum mortgage.
- Assuming every lender uses the same income multiple. High-street banks typically lend 4–4.5× income, but specialist lenders may offer 5–5.5× for higher earners or certain professions. Shopping around or using a broker can unlock significantly more borrowing.
- Forgetting upfront costs eat into your deposit. Stamp duty, solicitor fees, surveys and moving costs can easily total £5,000–£15,000. If these come out of your savings, your effective deposit shrinks and your LTV rises, potentially pushing you into a worse rate tier.
- Not stress-testing against rate rises. Lenders stress-test at rates 2–3% above the product rate. You should do the same: if the Bank of England base rate rises from 4.5% to 6%, could you still afford the payments? Budget for the worst case, not just today’s rate.
5 Steps to Check Your Mortgage Affordability
- Add up your total gross income. Include your base salary, any regular bonuses, overtime, commission, rental income and any other verifiable earnings. For joint applications, combine both incomes.
- List all monthly debt commitments. Note every recurring financial obligation: credit cards (minimum payments), car finance, personal loans, student loan repayments, child maintenance and subscription finance agreements.
- Estimate your available deposit. Total your savings, then subtract the cash you will need for stamp duty, legal fees, surveys and a moving buffer. The remainder is your realistic deposit.
- Apply the lender income multiple. Multiply your gross income by 4–4.5 (standard) or up to 5.5 (specialist). Then reduce the result by roughly 4× your annual debt commitments to get an adjusted borrowing figure.
- Stress-test with our calculator. Enter your figures into the mortgage affordability calculator above and review the results at different interest rates. Check that the monthly repayment is comfortably within 30–35% of your net monthly income.
How Salary Affects Your Borrowing Power (2026 Estimates)
The table below shows indicative maximum mortgage amounts at standard (4.5×) and enhanced (5.5×) income multiples, assuming no outstanding debts.
| Gross Annual Salary | 4.5× Multiple | 5.5× Multiple |
|---|---|---|
| £25,000 | £112,500 | £137,500 |
| £35,000 | £157,500 | £192,500 |
| £50,000 | £225,000 | £275,000 |
| £65,000 | £292,500 | £357,500 |
| £80,000 | £360,000 | £440,000 |
| £100,000 | £450,000 | £550,000 |
| £60,000 + £40,000 (joint) | £450,000 | £550,000 |
Figures are for illustration only. Actual offers depend on credit score, outgoings, deposit size and the lender’s criteria.
Did You Know?
Pro Tips for Maximising Your Borrowing Power
- Mortgage brokers advise: get a “decision in principle” from two or three lenders before house-hunting. This gives you a realistic budget and shows estate agents you are a serious buyer, strengthening your negotiating position.
- Financial planners suggest: aim to keep your total housing costs (mortgage, insurance, maintenance) below 35% of your net monthly income. This leaves enough headroom for rate rises, unexpected repairs and comfortable day-to-day living.
- Credit experts recommend: check your credit file with all three agencies (Experian, Equifax and TransUnion) at least three months before applying. Correcting errors or closing unused credit accounts early can materially improve the offers you receive.
- Tax advisers point out: salary sacrifice pension contributions reduce your gross income on payslips, which can lower the income figure lenders use. If you are close to a borrowing threshold, temporarily reducing pension contributions (and restoring them after completion) could bridge the gap.
Potential Savings
Clear a £250/mo Car Loan First
Paying off a £250/month car finance agreement before applying could increase your mortgage offer by up to £13,500 (at a 4.5× multiple), letting you target a higher-value property or a better LTV tier.
Move from 90% to 85% LTV
On a £300,000 mortgage, dropping from 90% to 85% LTV typically reduces your interest rate by around 0.3–0.5%. Over a 25-year term, that could save you approximately £14,000–£23,000 in total interest.
Use a Broker to Access 5.5× Lending
If you earn £50,000, a standard 4.5× lender offers £225,000. A specialist 5.5× lender (accessed via a broker) could offer £275,000 — an extra £50,000 of borrowing that could mean the difference between a flat and a house.
Mortgage Affordability FAQs
Common questions about how much you can borrow for a UK mortgage.