Use the actual product rate. We'll stress test at +3pp.
Maximum borrowable
£123,430
Maximum property price (with your £50,000 deposit): £173,430
Below typical lender criteria
Desired: £250,000
Required loan: £200,000 (80.0% LTV) · Monthly at 5%: £1,169 · Stressed at 8.0%: £1,544
Stressed monthly payment (£1,544/m) exceeds affordability cap
Income multiple cap
£225,000
4.5× assessed income
Affordability cap
£123,430
From stressed monthly payment
Stress-test monthly
£1,544
Lenders test you can pay this if rates rise
Affordability is your binding constraint. Reducing other commitments (credit cards, car finance) would let you borrow more.
How the numbers add up
Total assessed income (incl. 50% bonus)
£50,000
Total net (rough PAYE, std code)
£39,520
Monthly net
£3,293
− Credits + childcare + other commitments
−£0
Monthly disposable
£3,293
× 35% allocated to housing − £200 other costs
£953
Stressed at 8.0% over 25y → max principal
£123,430
How do UK mortgage lenders calculate affordability?
UK lenders apply two parallel tests, and the lower result binds. The first is an income multiple cap, typically 4.5× combined income — some lenders go to 4.75× or 5× for higher earners (around £50k+ sole or £75k+ joint), and 5.5× for specific professions through specialist channels. The second is an affordability assessment based on monthly disposable income after credit commitments, childcare, and per-dependant deductions (~£300–£400/month). The Bank of England requires lenders to stress test repayments at typically 3 percentage points above the product rate, ensuring you could still pay if rates rose. Self-employed applicants normally need 2–3 years of accounts and may face slightly stricter criteria. Combine this with the Stamp Duty Calculator to budget transaction tax, and the Take-home Pay Calculator for an exact net-pay figure.
Income multiple vs affordability — which limits you?
Worked example: a sole applicant earning £50,000 with £200/month childcare and £300/month car finance. Income multiple at 4.5× = £225,000. Affordability: net of about £3,290/month, minus £500 commitments = £2,790 disposable. At a 35% housing allocation = £977/month for housing, minus £200 of other home costs (insurance, council tax) = £777/month for the mortgage. Solving the annuity formula at 8% (5% + 3% stress) over 25 years gives roughly £100,000 of borrowable principal. The affordability cap is dramatically lower than the income multiple — affordability is what binds for this applicant. This is why high-street lenders feel "tighter" than the headline 4.5× rule suggests.
Joint mortgages and combining incomes
Joint mortgages typically use 4.5× of combined income — so £40k + £30k = £70k × 4.5 = £315,000 maximum. Both applicants' debts and commitments still count for the affordability test, so couples should pay down credit cards and avoid new finance applications in the months before applying. A few lenders take only 50% of a much lower second income, but most use 100% of both. Up to four people can be on the deeds, but mortgages typically only count two incomes. Once you know your maximum borrowing, see our Stamp Duty Calculator to factor in transaction tax, and the Mortgage Overpayment Calculator to see how extra payments shorten the mortgage. Once you have the mortgage, calculate the cover needed to clear it for dependants if you die, or model wider needs with the Life Insurance Needs Calculator.
Frequently asked questions
How much mortgage can I afford on £50,000 salary in 2026?
▾
On a £50,000 sole income with a typical 4.5× income multiple, the headline cap is £225,000. But lenders also run an affordability test — your net pay (~£39,500) gives roughly £3,290/month, of which lenders allow ~35% for housing minus other home costs. With no other commitments, that supports a stressed monthly payment of around £950, which back-solves to about £125,000 of mortgage at the 8% stress rate over 25 years. So in practice many sole £50k borrowers are limited by the affordability cap (£125k) rather than the headline 4.5× cap (£225k). Use the calculator above to model your exact situation.
What is the typical mortgage income multiple in the UK?
▾
Most high-street UK lenders cap loans at 4.5× annual income for sole and joint applications. Some — typically Halifax, Nationwide, and a few specialists — offer 4.75× or 5× for higher earners (usually £50k+ sole or £75k+ joint), and a handful go to 5.5× for professionals (doctors, lawyers, accountants) earning £75k or more. These multiples apply to base salary plus a haircut on bonuses (often 50%) and other regular income. The income multiple is one of two caps — affordability is the other, and the lower of the two binds.
How does a stress test affect what I can borrow?
▾
Stress testing can significantly reduce how much you can borrow — lenders assess whether you could afford repayments at the product rate plus 3 percentage points, so a 5% mortgage is stressed at 8%. If your income supports the payment at 5% but not at 8%, lenders will not offer that loan size. The PRA removed its specific stress rate floor in 2022, but lenders still apply their own internal floors. In practice, the stress test typically cuts borrowing capacity by 10–20% compared to a simple income-multiple calculation.
Can I get a mortgage as a self-employed person?
▾
Yes, but the bar is higher. Most lenders require 2 years of self-assessment SA302s and tax-year overviews; a few accept 1 year. Limited-company directors are usually assessed on salary plus dividends from their own company, with some specialists looking at retained profits instead. Self-employed applicants typically face the same income multiples as employees (4.5×) but stricter affordability scrutiny. Expect to provide business bank statements, accountant references, and proof of consistent income. Specialist lenders (Kensington, Pepper, Aldermore) often have more flexible self-employed criteria than the high street.
How does joint income affect mortgage affordability?
▾
Joint mortgages combine both applicants' incomes for the multiple — so £40,000 + £30,000 = £70,000, capped at 4.5× = £315,000. Both applicants' debts and commitments are also combined for the affordability test. A few lenders cap a much smaller second income (e.g. taking only 50% of a partner earning under £20k) but most use full 100% of both. Up to four applicants can be named on a joint mortgage, but most lenders only count two incomes. Joint and Borrower-Sole-Proprietor (JBSP) mortgages let a parent's income boost a child's borrowing without going on the deeds.
What's the maximum LTV available in 2026?
▾
Most mainstream lenders offer up to 95% LTV (5% deposit) for first-time buyers and home movers, with the Government's Mortgage Guarantee Scheme backing several 95% products. A small number of specialist lenders go to 100% with a guarantor or family deposit (e.g. Skipton's Track Record mortgage). Buy-to-let mortgages typically cap at 75–80% LTV. The headline rate gets cheaper at lower LTVs — the biggest pricing breaks are usually at 90%, 85%, 80%, 75%, and 60% LTV. If you can stretch the deposit to push below an LTV threshold, you can shave 0.2–0.5% off the rate.
Calcsmith provides estimates based on the information you enter. Lender criteria vary — always confirm exact figures with a qualified mortgage broker or your chosen lender. Not financial advice.