How much mortgage can I get on a £40,000 salary in the UK?

Using the most common income multiple, lenders will typically offer between £160,000 (4×) and £180,000 (4.5×) on a £40,000 salary. Some specialist lenders will go to £200,000–£220,000 (5–5.5×) for certain professions or higher earners. The actual figure depends on your outgoings, credit history, deposit size, and the lender's affordability assessment — the income multiple is a starting point, not a final answer.

Can I get a mortgage of 5 times my salary in the UK?

Yes, but not easily. Most high-street lenders cap at 4–4.5×. Some lenders — including Nationwide and Halifax under specific schemes — will stretch to 5× or 5.5× for first-time buyers or high earners (typically over £60,000 a year). You usually need a clean credit file, a deposit of at least 10%, and limited existing credit commitments to qualify.

Does a bigger deposit mean I can borrow more?

A bigger deposit doesn't directly increase the amount you can borrow — it reduces the loan-to-value ratio, which unlocks lower interest rates. A lower rate means lower monthly repayments, which can make a larger loan more affordable in the lender's assessment. So indirectly, yes: a 20% deposit often lets you access rates 0.5–1% lower than a 5% deposit, which meaningfully changes what passes the stress test.

What is mortgage stress testing and why does it matter?

Stress testing is when a lender checks whether you could still afford repayments if interest rates rose significantly — typically 3% above the lender's standard variable rate. In 2024, with standard variable rates around 7–8%, lenders are stress-testing at roughly 10–11%. This is the main reason two people on identical salaries can be offered very different amounts: the one with fewer outgoings passes the stress test more easily.

Should I use a mortgage broker or go directly to a lender?

A whole-of-market broker is almost always the better move, particularly for first-time buyers. They can access deals not available on the high street, know which lenders are more flexible on affordability, and save you the hard credit checks that come with applying to multiple lenders yourself. Most brokers are free to buyers (paid by the lender). Your bank will only show you their own products.

Finance

How Much Mortgage Can I Actually Afford in the UK?

Most first-time buyers either overestimate or underestimate what they can borrow. The income multiple method is a rough guide at best. Here's what UK lenders actually look at.

7 April 2026

By Krishna Chaitanya, Software Engineer

A friend spent four months viewing properties between £350,000 and £400,000. She'd done the mental arithmetic, her salary, a rough multiple, and felt confident in the range. When she finally sat down with a lender, she was offered £290,000. The properties she'd been falling in love with were never within reach.

The opposite happens too. Buyers assume they can't possibly afford something, never ask, and end up in a smaller flat than they needed. The gap between what people think they can borrow and what lenders will actually offer is often enormous, in either direction.

This article explains how UK mortgage affordability actually works, what lenders look at beyond your salary, and how to get a realistic number before you start booking viewings.

Why "I earn £X, so I can borrow £Y" Is Wrong

The income multiple shorthand, multiply your salary by four or four and a half and that's your mortgage, is not how UK lending has worked since 2014.

The Mortgage Market Review, which came into force that year, required lenders to move away from simple income multiples toward proper affordability assessments. The rule change was a direct response to the pre-2008 era of income self-certification and rubber-stamped loans. Since then, what you earn is only one input. What matters equally is what you spend, what you owe, and whether you could keep paying if rates went up by three percentage points.

This is why two colleagues on identical salaries, living in the same city, can walk out of the same bank with offers that differ by £50,000 or more. One has a car on finance, a £5,000 credit card balance, and a childcare bill. The other has none of those. The lender sees them very differently.

The income multiple still exists as a ceiling. Lenders generally won't go above 4.5x in normal circumstances. But the affordability assessment is what determines how close to that ceiling you can actually get.

What You Actually Need to Know

The income multiple method

Most UK lenders will offer between 4x and 4.5x your gross annual income, either single or joint if buying with a partner. Some specialist lenders will stretch to 5x or 5.5x for applicants earning above a certain threshold, typically £60,000 or more as a single applicant, or £100,000 jointly.

A rough guide:

Gross income	4x	4.5x	5x
£30,000	£120,000	£135,000	£150,000
£45,000	£180,000	£202,500	£225,000
£60,000	£240,000	£270,000	£300,000
£63,000 (joint)	£252,000	£283,500	£315,000

These are upper limits, not guaranteed offers. They tell you the ceiling, not the floor.

The affordability method (what actually determines your offer)

Lenders look at your take-home pay, subtract your committed monthly outgoings, loans, credit card minimum payments, car finance, student loan deductions, childcare costs, and then stress-test the remaining figure against a higher interest rate than the one you'd actually be paying. In 2024, with standard variable rates sitting around 7-8%, that stress test typically runs at 10-11%.

If the stressed monthly repayment on the loan you're requesting exceeds a set proportion of your disposable income, the application fails, regardless of what the income multiple calculation suggested.

This is why reducing your outgoings before applying matters. Paying off a £5,000 personal loan or reducing a credit card limit can directly increase how much a lender will offer.

The deposit effect

A larger deposit doesn't increase the maximum you can borrow outright, but it does something nearly as useful: it lowers your loan-to-value ratio, which unlocks better interest rates. The difference between a 90% LTV and an 80% LTV product can be 0.5-1% in annual interest. On a £250,000 loan over 25 years, that's a difference of roughly £75-£150 per month in repayments, which in turn affects how the affordability assessment goes.

My view: if you're deciding between stretching your deposit by another 6 months of saving versus buying now at a worse rate, the maths of waiting is usually closer than buyers think.

How the Mortgage Calculator Helps

Before you speak to a lender or a broker, it's worth running your own numbers to understand the ballpark. Our Mortgage Calculator lets you input:

Property price
Deposit amount
Mortgage term (typically 25 or 30 years)
Interest rate (use the current best-buy rate as a guide)

It outputs your estimated monthly repayment, total interest paid over the full term, and total cost of the mortgage. These are planning figures. A broker will give you an actual number based on your specific circumstances. But they help you understand the landscape before you walk into any conversation.

The calculator is particularly useful for scenario testing: what does a 5-year fix at 4.2% look like versus a 2-year fix at 3.9%? What happens to monthly repayments if you borrow £20,000 less? Run the numbers first, then ask informed questions.

A Worked Example

A couple buying together: Sarah earns £35,000 and James earns £28,000. Joint income: £63,000.

They've saved a £28,000 deposit and found a house priced at £280,000. That means they need to borrow £252,000, a loan-to-value of 90%.

At a 4.5% interest rate over 25 years:

Monthly repayment: approximately £1,380
Total repaid over 25 years: approximately £414,000
Total interest paid: approximately £162,000

The income multiple check: £252,000 divided by £63,000 = exactly 4x. That's well within the standard range, so the ceiling isn't the issue. The affordability question is whether their disposable income, after all committed outgoings, is large enough to pass the stress test at around 7-8%.

If James has a car on finance at £350/month and Sarah has a student loan deduction, those both reduce the disposable figure the lender sees. Running those figures through a broker conversation early tells them whether they're comfortably in range or right at the edge.

Mortgage Calculator showing monthly repayment for a £252,000 mortgage at 4.5%

What to Do With the Result

Once you have a figure you're working towards, from the calculator or an initial broker conversation, the next steps are:

Get a mortgage in principle before viewing houses. An Agreement in Principle (AIP) is a conditional offer from a lender confirming roughly what they'd lend you. Estate agents take you more seriously with one. It takes 20-30 minutes to arrange and uses a soft credit check (which doesn't affect your score).

Use a whole-of-market broker, not just your bank. Your bank will show you their products. A broker has access to the full market and knows which lenders are more flexible on affordability for your specific profile. For first-time buyers, this difference can be £30,000-£50,000 in what you're offered.

Check your credit report before you apply. Errors on credit reports are more common than people expect. You want three to six months to fix anything before a formal application. Check with all three agencies: Experian, Equifax, TransUnion.

Once you have a number, sense-check whether buying actually makes more financial sense than renting at your stage. Our Rent vs Buy Calculator runs that comparison properly, accounting for opportunity cost of the deposit, projected house price growth, and renting flexibility.

Common Mistakes

Checking with only one lender and accepting their number as final. Mortgage pricing varies by more than 1% between lenders for the same borrower profile. A rate difference of 0.8% on a £250,000 mortgage over 25 years is approximately £25,000 in total interest. The first offer you receive is rarely the best one available.

Forgetting stamp duty and solicitor fees when calculating how much deposit you actually have. First-time buyers in England pay no stamp duty on the first £425,000 (as of 2024), but second-time buyers pay from £250,000 upwards. Solicitor (conveyancing) fees typically run £1,500-£3,000. Survey costs add another £400-£1,500. If you've earmarked £40,000 as your deposit and haven't set aside anything for these costs, your actual available deposit may be closer to £35,000, which changes your LTV and the rates you can access.

Underestimating ongoing costs after purchase. Leasehold flats carry service charges (often £1,500-£4,000 per year) and ground rent. All properties need buildings insurance. Maintenance costs for an older property can average 1-2% of the property value per year. None of these appear in a mortgage repayment figure, but all of them affect what you can comfortably afford month to month.

For informational purposes only. This is not financial advice. Speak to a whole-of-market mortgage broker for personalised recommendations.

The number you can afford is not the number your income multiple suggests. It's the number that passes a lender's affordability assessment, fits your actual monthly outgoings, and leaves you enough headroom that a rate rise doesn't put you under pressure. Use the calculator to understand the landscape, then get a broker to give you the real figure.

Run the numbers with our Mortgage Calculator