| How Much Can I Borrow — Key Facts | |
|---|---|
| Standard cap | 4.5× gross annual income (Bank of England LTI rule) |
| High earner cap | Lenders can exceed 4.5× for up to 15% of mortgages (PRA SS13/16) |
| Stress test rate | Lenders test affordability at your pay rate + typically 3% (FCA MCOB 11) |
| Minimum deposit | 5% (95% LTV) available; rates improve materially at 10%, 15%, 25% |
| Self-employed | 2–3 years SA302s; some lenders accept 1 year with strong accounts |
The Bank of England's loan-to-income (LTI) flow limit restricts lenders from advancing more than 4.5 times gross annual income on more than 15% of their new mortgage lending. In practice almost all high-street lenders apply 4.5× as their standard ceiling. However the actual amount you are offered depends heavily on how a lender stress-tests your payments, how they treat your income type, and what existing credit commitments you carry.
How Lenders Stress-Test Your Mortgage
Under FCA Mortgage Conduct of Business (MCOB 11), lenders must assess whether you could afford repayments if your rate rises. The standard stress test adds approximately 3 percentage points above the reversion rate (the lender's standard variable rate, typically 7–8%). On a £300,000 mortgage at 4.5% the monthly payment is approximately £1,665. At the stress rate of 7.5–8% the same mortgage costs £2,100–£2,175. The lender must be satisfied your income can support the higher figure after committed expenditure.
| 💡 Tip: If you are close to the affordability boundary, a larger deposit improves your LTV tier, which lowers your rate — and therefore the stress-test rate applied. |
Income Type Treatment
| Income type | Typical treatment | Documents required |
|---|---|---|
| PAYE employed | 100% of gross basic | 3 months payslips + P60 |
| Regular overtime/bonus | 50–100% depending on lender | 6–12 months payslips |
| Self-employed (sole trader) | 2–3 year average of net profit | SA302 + tax year overview |
| Self-employed (Ltd company director) | Salary + dividends, some accept salary + net profit | SA302, accounts, accountant letter |
| Contractor (day rate) | Annualised day rate × 46–48 weeks | Current contract + 2 years history |
| Benefits income | DLA/PIP usually included; tax credits sometimes excluded | Award letters |
| Rental income | 70–75% of rental income accepted by most lenders | Tenancy agreement + 12 months statements |
LTV Band and Rate Tier
Your loan-to-value ratio determines which rate tier you access. Higher LTV means higher rate, which affects both cost and the stress-test outcome.
| LTV band | Typical rate premium over best buy | Example rate (May 2026) |
|---|---|---|
| 60% LTV | Benchmark (best rates) | ~4.1% 2-year fix |
| 75% LTV | +0.2–0.4% | ~4.4% |
| 85% LTV | +0.5–0.8% | ~4.8% |
| 90% LTV | +1.0–1.5% | ~5.3% |
| 95% LTV | +1.8–2.5% | ~6.0–6.5% |
Worked Examples at Five Income Levels
| Gross income | 4.5× cap | Stress-tested max (approx) | 10% deposit required |
|---|---|---|---|
| £25,000 | £112,500 | ~£95,000–105,000 | £10,500–£11,250 |
| £35,000 | £157,500 | ~£130,000–148,000 | £13,000–£15,750 |
| £50,000 | £225,000 | ~£185,000–215,000 | £18,500–£22,500 |
| £75,000 | £337,500 | ~£280,000–325,000 | £28,000–£33,750 |
| £100,000 joint (£50k+£50k) | £450,000 | ~£375,000–430,000 | £37,500–£45,000 |
The stress-tested maximum is lower than the 4.5× cap in all cases because lenders must also deduct committed monthly expenditure — existing loan payments, credit card minimums, car finance — before applying the income multiple. A borrower on £50,000 with £500/month in existing loan repayments may find their effective maximum is £170,000 not £225,000.
Joint Mortgages
For joint applications lenders combine both incomes and apply the same 4.5× cap to the combined figure. Both applicants' credit files are assessed. The weaker credit profile can reduce the available rate. Some lenders offer up to 5.5× income for first-time buyers with higher incomes — check lender-specific criteria.
Mortgage in Principle
A Decision in Principle (DIP) or Agreement in Principle (AIP) is not a mortgage offer but gives you a reliable indication of what a lender will lend. It usually involves a soft credit check (no footprint on your file). Get one before making an offer on a property — estate agents treat it as evidence of affordability.
| Disclaimer: This article is for information only and does not constitute financial, legal or tax advice. Figures are correct at date of publication but may change. Always check primary sources (gov.uk, FCA register) and consult a qualified adviser for guidance tailored to your situation. |
Frequently Asked Questions
Can I borrow more than 4.5× my income?
Yes, in limited circumstances. Some lenders offer up to 5.5× for high earners (typically £75,000+) or professionals. Nationwide, Halifax and Barclays all have enhanced income multiple products. The PRA permits lenders to place up to 15% of new lending above 4.5× — but these products carry higher rates and tighter criteria.
Does my partner's debt affect my borrowing?
On a joint application yes — both credit files and all committed payments are assessed. On a sole application your partner's debt is not directly assessed, but if you are financially associated on your credit file (e.g. a joint bank account or previous joint credit) the lender may review their file.
How does a Help to Buy equity loan affect borrowing?
The Help to Buy scheme closed to new applicants in March 2023 and is no longer available for new purchases. If you have an existing equity loan, repayments count as a committed expenditure in affordability calculations when you remortgage.
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