Most people assume a mortgage offer is roughly four times their salary. It isn’t.
Lenders don’t look at what you earn. They look at what they can verify, what’s consistent, what’s likely to continue, and what their policy allows them to count. Those are four different filters – and your headline salary only clears two of them automatically.
Understanding the gap between what you make and what qualifies is the most important thing you can do before you apply – and it connects directly to how lenders assess mortgage affordability.
Lender or broker reviewing income documents during a UK mortgage affordability assessment
Why Income Is Not Taken at Face Value
After the Mortgage Market Review in 2014, lenders were required to verify that borrowers could afford repayments not just at current rates, but under stress – typically 1 to 3 percentage points higher. That changed everything about how income gets assessed.
The result is that every income figure you present gets tested against what can be verified, what has been consistent, and what the lender’s own policy allows them to count. How your pay is structured determines how much of it actually makes it through.
What Gets Included; and What Does Not
Basic Salary
Your contracted basic salary is the foundation. Most lenders accept it in full as long as it appears consistently on payslips and matches your employment contract. If you’ve recently had a pay rise, some lenders will use the new figure, others will average the last twelve months.
Overtime
This is where assumptions start to unravel. Guaranteed contractual overtime is usually treated like regular pay. Variable overtime is different. Most high-street lenders take a one to two year average and then apply a 50% haircut. A worker earning £40,000 basic plus £10,000 variable overtime may find only £44,000 to £45,000 of that counts.
Bonuses
Contractually guaranteed bonuses are usually counted in full. Discretionary bonuses paid consistently over three years may be partially accepted – typically 50% of the average. A one-off bonus, regardless of size, is almost always excluded.
Commission
Commission follows a similar pattern. If it has been consistent and documented over two or more years, most lenders will average it and apply a percentage. If earnings swing sharply year to year, expect either a reduced figure or a requirement for a specialist lender.
Where Income Gets Reduced
Variable and Zero-Hours Contracts
Zero-hours and variable contract workers go through a more involved process. Most lenders want twelve months of bank statements and payslips to establish an average. That figure is then assessed conservatively given the absence of income security. Some high-street lenders won’t consider zero-hours income at all – there are specialist lenders who work with it regularly.
Self-Employed
Self-employed applicants face the steepest reductions. Sole traders are typically assessed on the lower of the last two to three years’ net profit – not the higher. If 2024 was your strongest year by some distance, don’t expect a lender to weight it heavily.
Limited company directors face a different but equally complex calculation. Most lenders use salary plus dividends actually taken. A director who retains profit in the company to manage personal tax will not be able to use those retained profits, even though they are technically earnings. A smaller number of specialist lenders will consider net profit plus drawings, which can make a material difference to the borrowing figure.
You will need SA302s and HMRC tax year overviews for the last two to three years – for a full explanation of what these are and how lenders use them, see what is an SA302. Gaps in those records, or a recent move from employment to self-employment, will narrow your lender options considerably.
Foreign Income
Income paid in a foreign currency gets discounted. Most high-street lenders apply a 20% to 25% currency haircut to account for exchange rate risk. Many won’t accept foreign income at all unless it’s paid into a UK bank account in sterling. Applicants with significant overseas earnings typically need specialist lenders – private banking or expat mortgage providers.
Why Two Lenders Give You Different Numbers
Every UK lender has its own underwriting policy. The FCA requires affordability to be verified – it doesn’t prescribe how. Which means two lenders looking at identical payslips can produce very different qualifying income figures.
Lender A might cap variable overtime at 50% of a two-year average. Lender B might accept 75% of a one-year average. Lender A might exclude commission entirely if it falls below £5,000 annually. Lender B might accept it in full if it’s been consistent for eighteen months. Same applicant. Same documents. Different outcome.
Lenders also treat commitments differently. One stress-tests your mortgage at 3% above the current rate. Another uses a higher figure. One treats your credit card limit as a liability even with no balance. Another only looks at minimum monthly payments.
Then there’s risk appetite. A lender managing its exposure in a particular sector may tighten multipliers across the board – nothing to do with your application specifically. A broker who works across the full market tracks this. You can’t – which is why going direct to your bank can limit your mortgage options more than most people realise.
Example Scenario: Same Income, Different Outcome
Consider an applicant approaching two different lenders with identical income.
| Income Component | Lender A | Lender B |
| Basic Salary | £42,000 (full) | £42,000 (full) |
| Variable Overtime (avg £8,000) | £4,000 (50%) | £6,000 (75%) |
| Bonus (avg £6,000) | Excluded | £3,000 (50%) |
| Qualifying Income | £46,000 | £51,000 |
| Income Multiple Applied | 4x | 4.5x |
| Maximum Loan Offer | £184,000 | £229,500 |
Same applicant. Same payslips. A £45,500 difference in borrowing power – entirely down to how each lender interprets the same income data.
This isn’t an edge case. It happens every day in the UK mortgage market. Which lender you apply to matters more than most people realise – and applying to the wrong one first doesn’t just mean a lower offer. It means a credit footprint that follows into the next application – the same issue that causes problems when mortgage deals fall through after an agreement in principle.
Your Income Might Be Strong – But That Doesn’t Mean It All Counts
What you earn and what a lender accepts are not the same thing. The gap between the two can be tens of thousands of pounds in borrowing power – sometimes more – and it’s almost never visible until someone who knows the criteria looks at your full income structure properly.
The lender who advertises the best rate is not always the right lender for your income type. The one who accepts your overtime in full may be stricter on commission. The one who works well with limited company directors may not touch zero-hours contracts.
Getting that match right before you apply is what determines the outcome. Getting it wrong doesn’t just mean a lower offer – it means a credit footprint that makes the next application harder.
Frequently Asked Questions
How do UK lenders check income for a mortgage?
Most want three months of payslips, a P60, and bank statements.
Self-employed applicants need SA302s and HMRC tax year overviews for the last two to three years.
Do lenders count bonus income for a mortgage?
It depends on the lender. Guaranteed bonuses are usually accepted in full.
Discretionary bonuses averaged over two to three years may get 50%. One-off bonuses are almost always excluded.
What is the maximum income multiple for a UK mortgage?
Most high-street lenders offer four to four-and-a-half times qualifying income.
Some specialist lenders go to five or five-and-a-half times for higher earners, subject to affordability.
How do lenders assess self-employed income for a mortgage?
Sole traders are assessed on the lower of the last two to three years’ net profit.
Limited company directors are typically assessed on salary plus dividends taken – not retained profit.
Can foreign income be used for a UK mortgage?
Yes – but most high-street lenders apply a 20% to 25% currency discount or won’t accept it unless paid in sterling.
Specialist lenders are considerably more flexible.
Why did one lender offer me less than another?
Each lender sets its own policy on overtime, commission, bonuses and stress testing.
The same income can produce very different qualifying figures depending on whose criteria you’re assessed against.
Self-employed contractor reviewing income documents for a UK mortgage application
Speak to a Broker Who Knows How Lenders Actually Read Your Income
What you earn and what a lender will accept are not the same number. The difference between the two can determine whether your application succeeds, and by how much.
At UK Mortgage Broker we assess your full income structure before anything is submitted – what will be counted, what will be reduced, and which lenders are currently the right fit for how you’re paid. That matching process, done correctly upfront, is what prevents a declined application or a lower offer than you should have received.
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UK Mortgage Broker is directly authorised and regulated by the Financial Conduct Authority.