2026/27 Tax Year · England & NI
Mortgage Affordability Calculator
Work out how much you can borrow — and the maximum house price you can afford — starting from your take-home pay. Enter your income, deposit, the interest rate and loan term, and we'll estimate the mortgage a lender is likely to offer and the price you can target.
Check Your Mortgage Affordability
Lenders size your mortgage from your gross income using an income multiple (typically 4.5×). We add your deposit to get the price you can target, then show the monthly payment and the stamp duty you'll need in cash.
£
£
£
%
£0
Maximum house price you can afford (SDLT paid separately from savings)
Mortgage you can borrow
£0
Plus your deposit
£0
Monthly payment
£0
Stress-test payment (+3pp)
£0
Loan-to-value (LTV)
0%
Stamp duty (extra cash needed)
£0
How It's Calculated
Lenders size the loan from your gross income using an income multiple, then add your deposit to get the price. Stamp duty is a separate upfront cash cost on top.
| Step | Figure |
|---|---|
| Combined gross income | £0 |
| × Income multiple | 4.5× |
| − Debt reduction | £0 |
| Loan you can borrow | £0 |
| Loan term | 25 years |
| Interest rate (monthly cost) | 4.5% p.a. |
| + Deposit | £0 |
| Target house price | £0 |
| Loan-to-value (LTV) | 0% |
| Extra cash: stamp duty | £0 |
| Total cash needed (deposit + SDLT) | £0 |
💡 What lenders actually do
Most lenders cap borrowing at around 4.5× your combined gross income (more for high earners or private banks). Joint applications simply pool both salaries before the multiple.
Existing debts (loans, credit cards, car finance) are deducted from what you can borrow — we apply the standard reduction of annual debt ÷ income multiple.
Stamp duty is a one-off cost paid on completion — it can't be added to the mortgage, so we show it as separate cash on top of your deposit.
Affordability Tips
- Stress-test the rate: lenders often check you at a higher "stress rate" (e.g. +3 percentage points). We show the stress-test payment above — see if you'd still cope.
- Don't max the multiple: a 4.5× figure leaves room for bills, food and surprises. Try a lower multiple for a safer plan.
- Watch your LTV: a higher deposit lowers your loan-to-value, which unlocks cheaper rates. Below 60–75% LTV the best deals appear.
- Check your credit: lenders also look at your score, outgoings and dependants — this calculator is a guide, not a mortgage offer.