Free UK tool · Mortgage calculator UK 2026
Find out roughly what UK lenders are likely to offer based on your income, deposit, and existing debt. Free, private, no sign up — built for first-time buyers and movers trying to size up the market before talking to a broker.
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The mortgage affordability calculator UK above shows what UK lenders are typically willing to offer. Here's how to get a useful number out of it.
The result table shows your borrowing limit at four common income multiples — 4× and 4.5× single, 3.5× and 4× joint — so you can see the realistic envelope rather than a single misleading figure.
How lenders assess affordability
UK lenders typically lend 4–4.5× a single applicant's gross annual salary, or 3.5–4× combined gross salary for joint applications. The exact multiple depends on the lender, your credit profile, the deposit size, and the property type. Specialist lenders go to 5× or 5.5× for professionals or strong applicants — but those are exceptions, not the default. The calculator above shows the four most common multiples as a range so you don't anchor on a single optimistic or pessimistic number.
Lenders convert your monthly debt commitments to an annual figure and subtract that from your gross income before applying the income multiple. £400/month of debt is £4,800/year — at a 4× multiple, that's £19,200 less you can borrow. Worse: if your monthly debt-to-income ratio looks high, some lenders cap the multiple itself or decline outright. Clearing or consolidating high-interest debt before applying often unlocks materially more borrowing.
Lenders re-run your affordability check at a hypothetical higher interest rate — typically your offer rate plus 1–3 percentage points — to confirm the loan would still be affordable if rates rose. The Financial Policy Committee loosened formal stress-test rules in 2022 but most lenders still apply their own version. It's why a Decision in Principle figure can come back lower than an income-multiple calculator suggests — you're being checked against a worst-case rate, not today's rate.
The income-multiple maximum is the lender's risk ceiling, not a target. Borrowing 4.5× when 3.5× would do leaves you exposed if rates rise, your income changes, or essential costs increase. As a rule of thumb: if the monthly mortgage payment is more than 35% of your take-home pay, you're stretched. Use this calculator with a number you'd be comfortable paying every month — not the absolute maximum.
Different lenders run different affordability models. Some lean heavily on income multiples; others on a detailed budget calculator with food, transport, childcare, etc. fully itemised. A mortgage broker has access to dozens of lenders and can match your profile to the most generous one. Two applicants with identical incomes can see lender offers vary by £50,000+ depending on which lender they approach.
UK specifics
High-street lenders sit around 4× to 4.5× single income and 3.5× to 4× joint. Specialist lenders go further: Habito, Halifax (for professionals), Nationwide's Helping Hand product, and others reach 5×–5.5× for strong applicants. The Bank of England removed the cap on the proportion of mortgages a lender can issue above 4.5× LTI in 2022, giving lenders more flexibility — but most still operate in the 4–4.5× envelope for the bulk of their lending.
Help to Buy in England closed to new applications in 2023, but the equity loan still affects existing borrowers' affordability. Shared ownership lets you buy 25–75% of a home and rent the rest — your mortgage is on the share you own, so the income-multiple maximum applies to a smaller loan and you can buy in pricier areas with less income. A £200,000 25% share = £50,000 mortgage, achievable on much lower income than buying outright.
SDLT is paid in cash within 14 days of completion — it doesn't get added to the mortgage. As of 2025/26: 0% on the first £125,000, 2% on £125,001–£250,000, 5% on £250,001–£925,000, 10% on £925,001–£1.5M, 12% above £1.5M. First-time buyers get relief on properties up to £500,000 — 0% on the first £300,000, 5% on £300,001–£500,000. Above £500,000, FTB pay standard rates with no relief. SDLT comes out of your deposit funds, so a "30k deposit" buying a £350k house is really ~£25k deposit + ~£5k SDLT.
Bank Rate is the foundation that mortgage rates are priced from. Lenders' Standard Variable Rates and tracker mortgages move with it directly; fixed-rate deals are priced off SONIA swap rates which themselves track Bank Rate expectations. When Bank Rate rises, stress-test thresholds rise too, so what you can borrow falls even if your income hasn't changed. Watch the Monetary Policy Committee's announcements — they sit alongside Budget statements as the biggest single driver of UK affordability shifts.
No stress test (real lenders re-check at higher rates). No credit score, employment-history, or deposit-source assessment. No property valuation. The figure you see is the income-multiple ceiling — useful as a first sanity check, but get a Decision in Principle from a broker or lender before house-hunting. The DIP gives you a concrete number based on your real circumstances.
FAQ
The questions people most often type into Google about UK mortgage affordability.
Most UK lenders use income multiples: typically 4× to 4.5× a single applicant's gross salary, or 3.5× to 4× combined gross salary on a joint application. So a £40,000 single income would lend £160,000–£180,000; a £80,000 joint income would lend £280,000–£320,000.
Existing monthly debt commitments reduce the figure because lenders subtract a year's worth of debt payments before applying the multiple. The calculator above shows your range across the four common multiples.
It estimates the maximum you could borrow by applying standard UK lender income multiples to your gross income, after subtracting a year's worth of monthly debt commitments. Add your deposit and you get a maximum property price.
Real lender decisions add a stress test, but the income-multiples model is what most affordability calculators publish and is a useful first sanity check.
Typical UK lender multiples for 2025/26 are 4× to 4.5× single income, 3.5× to 4× joint. Some specialist lenders go to 5× or 5.5× for professionals (doctors, lawyers, accountants) or strong applicants in their 30s with stable incomes.
Below 4× is the safe default; above 4.5× depends heavily on credit profile, deposit size, and other commitments.
On a joint application, lenders combine the two gross salaries before applying the multiple. The multiple itself is usually slightly lower than for a single application — often 3.5× joint vs 4× single.
So £40k + £40k joint at 3.5× = £280,000, versus a single £80k at 4× = £320,000. The calculator above lets you toggle on a second income and shows both single and joint multiples in the result table.
Three layers: income multiple (4–4.5× single, 3.5–4× joint), debt-to-income deduction (existing monthly commitments × 12 subtracted from income before the multiple), and stress test (re-checking affordability at a higher hypothetical rate).
Beyond those, lenders look at credit score, employment status, deposit source, and the property's valuation.
Yes, but options narrow as income drops. At £20,000 gross, a 4× multiple gives £80,000 — enough for cheaper regional homes but not most of the South East.
Tools that help: shared ownership (buy a 25–75% share, rent the rest), Lifetime ISAs (25% government bonus on deposit savings), and joint borrower / sole proprietor mortgages where a parent's income supports the loan but they're not on the deeds. A specialist broker can identify lenders with lower income floors or regional schemes.
Indirectly, yes. The income-multiple maximum doesn't change with deposit size, but the mortgage rate you'll be offered does — bigger deposits unlock cheaper LTV bands.
A 25% deposit drops you into 75% LTV territory and can save 0.5–1.5 percentage points on the rate vs a 5% deposit at 95% LTV. Lower rate = lower monthly payment = easier to pass affordability stress tests.
No — it's an estimate using the income-multiple model that most public affordability calculators use. Real lender decisions also apply stress tests, credit checks, and detailed budget assessments.
Use it as a sanity check before you talk to a broker, then get a Decision in Principle from a real lender to see what your actual offer looks like.
The full picture
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