UK average house prices crossed £300,000 for the first time in early 2025, according to Halifax — and for most people, that means a mortgage of well over £200,000. Working out exactly how much you can borrow sounds simple: multiply your salary by a number and you're done. The reality is far more complicated, and understanding how lenders actually make their decisions could mean the difference between getting the home you want and coming up short.
Average UK house price
£300,000+
Standard income multiple
4–4.5x
Max statutory redundancy pay
£21,570
The Income Multiple: Where It All Starts
Most lenders begin with an income multiple — a simple formula that caps how much they'll lend relative to what you earn.
For a single applicant, the typical ranges are:
- 4x income — the conservative default at many high street banks
- 4.5x income — the standard upper limit for most mainstream lenders
- 5x–5.5x — available for higher earners (typically £60,000+) or certain professions like doctors, dentists, lawyers and accountants
For joint applicants, lenders usually apply 3.5x to 4x combined income. Some use a blended approach: 4.5x the higher earner's salary plus 1x the lower earner's. It sounds complicated, but in practice it often pushes the offer higher than a straight combined multiple.
Here's what the numbers actually look like:
| Salary | 4x | 4.5x | 5x |
|---|---|---|---|
| £30,000 | £120,000 | £135,000 | £150,000 |
| £40,000 | £160,000 | £180,000 | £200,000 |
| £50,000 | £200,000 | £225,000 | £250,000 |
| £60,000 | £240,000 | £270,000 | £300,000 |
| £75,000 | £300,000 | £337,500 | £375,000 |
Here's the thing: the FPC (Financial Policy Committee) limits lenders so that no more than 15% of their new mortgages can be at 4.5x income or higher. So while 5x is technically possible, it's a minority of cases. Don't plan your budget around it.
But Banks Don't Just Look at Your Salary
This is the part most mortgage guides gloss over. Your income multiple is the starting point — but lenders run a full affordability assessment that can push the offer up or, more often, bring it down.
1. Monthly outgoings — childcare costs, car finance, personal loans, credit card minimums, even Netflix and gym memberships all feature on your bank statements. Lenders look at your committed spending, not just your income.
2. Credit commitments — existing debt reduces what you can borrow roughly pound for pound. A £15,000 personal loan with £300/month repayments might cut your mortgage offer by £30,000–£40,000.
3. Number of dependants — each child typically reduces borrowing capacity by roughly £10,000–£20,000 at most lenders. A couple with two children earning £80,000 combined may borrow significantly less than a childless couple on the same income.
4. Employment type — employed, self-employed, contractor, and agency workers are all assessed differently. Self-employed applicants face more scrutiny (see below). Contractors can sometimes use their day rate instead of accounts profit, depending on the lender.
5. Bonus and commission income — most lenders count only 50%–75% of it, and some exclude it entirely unless you've received it consistently for two or more years.
6. Overtime — similar rules apply. Guaranteed overtime may be counted in full; voluntary overtime is usually discounted.
Lenders look at your last 3–6 months of bank statements. In the months before applying, it's worth cancelling unused subscriptions, paying off small debts and keeping spending predictable. What looks like harmless day-to-day spending can flag as a risk to an underwriter.
The Stress Test: What It Means for You
The Bank of England withdrew its mandatory 3% stress test requirement in August 2022 — so you may have heard that affordability rules got easier. They did, slightly. But lenders still run their own stress tests under FCA rules.
What this means in practice: they model what would happen to your payments if interest rates rose significantly. If you'd struggle to meet repayments at a higher rate, they may reduce the offer — even if you can comfortably afford repayments at today's rates.
This is why some borrowers with good salaries are surprised by how much less they're offered than the income multiple suggests. The stress test caps the offer in ways the headline multiple doesn't show.
Fixed-rate mortgages of five years or more are sometimes stress tested more leniently, because the rate is locked in for an extended period. If you're close to the affordability limit, a longer fix could get you a bigger mortgage.
How Your Deposit Changes Everything
Your loan-to-value ratio (LTV) affects both the size of your mortgage offer and — crucially — the rate you pay on it. The difference between a 5% and a 25% deposit isn't just the amount you borrow: it's the rate, the lender choice, and the monthly cost.
| Deposit | LTV | What it means |
|---|---|---|
| 5% | 95% | Limited lenders, highest rates on the market |
| 10% | 90% | Much wider lender choice, meaningfully better rates |
| 15% | 85% | Rates improve noticeably; more deals available |
| 25% | 75% | Mainstream best-buy territory |
| 40% | 60% | Access to the best rates available |
The real-world cost difference is substantial. On a £250,000 mortgage over 25 years:
- 90% LTV at 5.5%: approximately £1,528/month
- 75% LTV at 4.5%: approximately £1,376/month
- 60% LTV at 4.0%: approximately £1,320/month
That's over £200/month difference from a bigger deposit — £2,400 a year, every year. If you're close to a lower LTV threshold, it's often worth delaying and saving harder.
Self-Employed? Here's What Changes
If you're self-employed, the same income multiples apply — but evidencing your income is considerably more involved.
Most lenders require:
- 2–3 years of accounts — some accept one year for strong applicants, but this significantly limits your options
- SA302 tax calculations from HMRC, covering the last 2–3 tax years
- Tax year overviews from your HMRC online account
- Income is based on your average net profit over 2–3 years, not your turnover and not your most recent year in isolation
The reality is that self-employed borrowers with growing income often find their mortgage offer is based on a lower average than their current earnings suggest. If year one was £40,000 and year two was £65,000, many lenders average to £52,500.
Contractors are sometimes in a better position than sole traders — some specialist lenders will calculate income as your day rate × 46 weeks, which can produce a higher figure than company accounts.
If you're self-employed and planning to buy, speak to a whole-of-market broker before doing anything else. The gap between the most generous and the most restrictive lenders for self-employed borrowers is enormous.
What Costs to Budget for Beyond the Mortgage
The mortgage itself isn't the only bill arriving at completion. Most first-time buyers are caught out by the total cost of buying, which can easily reach £10,000 or more on top of the deposit.
| Cost | Typical amount |
|---|---|
| Stamp duty | 0%–5% of purchase price* |
| Solicitor / conveyancing | £1,000–£2,000 |
| Mortgage arrangement fee | £999–£1,999 |
| Valuation fee | £300–£500 |
| HomeBuyer survey | £400–£1,000 |
| Removal costs | £500–£2,000 |
| Total to budget | £4,000–£10,000+ |
*Use our Stamp Duty Calculator to calculate your exact SDLT liability based on property price and buyer type.
Arrangement fees can sometimes be added to the mortgage rather than paid upfront — but this means you pay interest on them for the full mortgage term. On a £1,500 fee at 4.5% over 25 years, adding it to the mortgage costs roughly £900 extra. Worth doing the maths before deciding.
How to Boost What You Can Borrow
There are concrete steps you can take in the months before applying to improve your offer — some more effective than others.
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Clear small debts before applying. A £200/month car loan can reduce your mortgage offer by £30,000 or more. Paying it off costs you the loan balance; the return in borrowing power is often worth it.
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Close unused credit cards. Available credit — even if you never use it — can reduce your offer. Lenders see it as potential future debt. Close cards you don't need.
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Get on the electoral roll. This is one of the most overlooked quick wins. Lenders use it to verify your address history. If you're not registered, fix it before applying.
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Don't apply for other credit in the 6 months before applying. Every application leaves a hard footprint on your credit file. Multiple footprints signal financial pressure to lenders.
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Declare all income. Overtime, freelance work, rental income and investment income all count if you can document them consistently. Don't assume lenders won't count secondary income — they might.
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Consider a longer mortgage term. Extending from 25 to 35 years reduces the monthly payment, which can push you over the affordability threshold. You'll pay significantly more interest overall, but it can be a pragmatic short-term lever.
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Joint application. Even a modest second income can boost total borrowing significantly. On a £30,000 salary, adding a partner earning £20,000 might take you from a £135,000 offer to a £175,000 offer.
Should You Use a Mortgage Broker?
For most people, yes. A whole-of-market broker compares every lender — including broker-exclusive deals you genuinely cannot access by going direct. The rate difference between a broker deal and a bank's headline product can easily be 0.3%–0.5%, which on a £200,000 mortgage over 25 years is thousands of pounds.
What brokers also bring is nuanced knowledge: they know which lenders are most flexible for self-employed applicants, which ones accept 1 year of accounts, which ones are more generous for contractors, and which ones treat bonus income most favourably.
Many fee-free brokers are paid by the lender on completion, so you pay nothing directly. Always check whether your broker is whole-of-market (they compare all lenders) or tied to a panel (they compare some, but not all).
Use Our Mortgage Affordability Calculator
Before speaking to a lender or broker, use our free UK Mortgage Affordability Calculator to get an instant estimate of what you could borrow — based on your income, outgoings, deposit size and a stress-test check. It takes under a minute and gives you a realistic range to work from before any conversation with a lender.
Frequently Asked Questions
Can I borrow 5x my salary?
Yes — some lenders offer this, particularly for higher earners (typically £60,000+) or certain professions including doctors, dentists, lawyers and accountants. It's not the norm and depends on your full financial picture, your deposit size and the lender's own criteria. Don't assume it's available until a broker has confirmed it for your specific circumstances.
Does student loan debt affect my mortgage?
Yes, it counts as an outgoing. The monthly repayment — typically £49–£200/month depending on your plan type and salary — reduces your affordability calculation. Plan 2 and Plan 5 borrowers on salaries above the respective thresholds will see a more significant impact than those who aren't yet in repayment.
How does a mortgage in principle work?
An Agreement in Principle (AIP) — sometimes called a Decision in Principle or DIP — is a conditional offer from a lender based on a basic credit check and income declaration. It's not binding, but most estate agents want to see one before accepting an offer on a property. Some AIPs use a soft credit check (no footprint on your file), others use a hard check. Ask before proceeding.
What's the minimum salary to get a mortgage in the UK?
There's no legal minimum, but the property must be affordable relative to your income. On a £30,000 salary with a 10% deposit, you could realistically borrow around £120,000–£135,000. Whether that gets you a property in your target area is a separate question — and the reason location flexibility matters so much in the current market.
Joint mortgage: do both salaries count?
Yes. Most lenders use combined income for the affordability calculation, though some weight the higher earner's income more heavily. A couple earning £35,000 and £25,000 combined (£60,000) might borrow £210,000–£240,000 at a 3.5x–4x combined multiple, or more if the lender applies a blended approach.
What if I have bad credit?
Bad credit reduces your lender options significantly but doesn't rule out a mortgage. Specialist lenders exist for borrowers with defaults, CCJs or missed payments — but rates are meaningfully higher, and the deposit requirement is typically 15% or more. The size of the issue and how long ago it occurred both matter. Defaults registered more than three years ago are generally treated more leniently than recent ones.