If you're thinking about buying a house, one of the first questions you'll probably ask is, "How much can I borrow for a mortgage?"
You might have heard that mortgage lenders will let you borrow around 4.5 times your annual salary. But is it really that simple?
Not quite!
While income multiples can give you a useful starting point, mortgage lenders look at much more than just your salary when deciding how much they're prepared to lend.
Whether you're a first-time buyer in Gloucester, moving house in Cheltenham or exploring your options elsewhere in the UK, understanding how mortgage affordability works can help you plan your next move.
Can you really borrow 4.5 times your salary?
Yes, 4.5 times your annual income is a commonly used starting point when talking about mortgage borrowing.
For example, if you earn £40,000 a year, multiplying your income by 4.5 gives you £180,000.
But that doesn't automatically mean a lender will offer you a £180,000 mortgage.
Some lenders may be prepared to lend more than 4.5 times your income, while others may offer less, depending on their lending criteria and your personal circumstances.
There are also regulatory limits on the proportion of new mortgages lenders can issue at higher income multiples.
So while the 4.5× calculation can be useful for an initial estimate, your actual borrowing amount will depend on a lender's full affordability assessment.
What does 4.5 times your income actually look like?
Here's how the calculation works using a few different annual income examples.
Annual gross income4.5× income£25,000£112,500£30,000£135,000£40,000£180,000£50,000£225,000£60,000£270,000£80,000£360,000
These figures are illustrations, not mortgage offers or guaranteed borrowing amounts.
They're based on gross annual income, which is your income before tax and other deductions.
If you're applying for a mortgage jointly, lenders will usually consider both applicants' eligible incomes, although their rules about which income sources they'll accept can vary.
What else do lenders consider when deciding how much you can borrow?
Your income is only one part of the affordability calculation.
Mortgage lenders also assess your financial commitments, household circumstances and ability to afford the mortgage repayments.
1. Your existing debts
Credit cards, personal loans, car finance and other borrowing commitments can all affect your mortgage affordability.
For example, two people earning £40,000 a year might receive very different mortgage offers if one has no existing borrowing and the other has significant monthly loan repayments.
Having debt doesn't automatically mean you can't get a mortgage. It's about how those commitments affect your overall affordability.
Different lenders also assess debts in different ways.
2. Your household expenditure
Lenders need to understand how much money you have available after your regular financial commitments.
This could include things such as:
Household bills and essential living costs.
Childcare and school fees.
Maintenance payments.
Travel and commuting costs.
Existing credit commitments.
Some lenders use standard household expenditure assumptions alongside the information you provide.
The amount you spend each month can therefore influence how much you're able to borrow.
3. Your dependants
If you have children or other financial dependants, lenders may factor the associated costs into their affordability calculations.
This doesn't mean having children prevents you from borrowing a particular amount, but it can affect the level of mortgage repayments a lender considers affordable.
4. Your income type
Not all income is assessed in the same way.
For example, lenders may have different rules for:
Basic salary.
Overtime and bonuses.
Commission.
Self-employed income.
Pension income.
Certain benefits or additional income sources.
Some lenders may accept a larger proportion of variable income than others.
This means the same applicant could receive different borrowing assessments depending on which lender they approach.
5. The mortgage term and interest rate
The length of your mortgage and the interest rate can also influence affordability.
A longer mortgage term will generally reduce your monthly repayments compared with a shorter term, although it can mean paying more interest overall.
Lenders also assess whether mortgage repayments are affordable under their lending rules, which may include considering the impact of higher interest rates.
Why might one lender offer you more than another?
This is something that often surprises people.
Mortgage lenders don't all use the same affordability calculations.
They have different policies around income, financial commitments, household expenditure and maximum borrowing.
For example, one lender might assess your bonus income differently from another. Another lender might have a different approach to childcare costs, existing credit commitments or your chosen mortgage term.
Some lenders also offer higher income multiples to applicants who meet particular criteria.
This is why an online mortgage calculator can be useful as a starting point, but it won't necessarily show you the full range of borrowing possibilities.
Does a bigger deposit mean you can borrow more?
Not necessarily.
Your deposit and your mortgage affordability are two different parts of the lending assessment.
A larger deposit can reduce the amount you need to borrow and may give you access to different mortgage products or interest rates.
However, lenders still need to be satisfied that you can afford the mortgage repayments.
For example, having a £100,000 deposit doesn't automatically mean a lender will approve a £300,000 mortgage.
Your income, commitments and overall affordability still matter.
How can you find out how much you could borrow?
If you're starting to look for a property, understanding your potential borrowing amount before you begin viewing houses can be really useful.
A mortgage broker can review your circumstances, explore different lenders' criteria and help you understand what borrowing options may be available.
You can also obtain an Agreement in Principle (AIP), sometimes called a Decision in Principle, which gives an indication of what a lender may be prepared to lend based on an initial assessment.
An AIP isn't a guaranteed mortgage offer. A full application, supporting documents and the lender's checks will still be required.
How much should you borrow versus how much can you borrow?
There's another important question worth considering.
Just because a lender is prepared to offer you a particular mortgage amount doesn't necessarily mean you need to borrow the maximum available.
Think about what monthly mortgage payment would feel comfortable alongside your other financial commitments and future plans.
You might want to allow room in your budget for holidays, home improvements, savings or changes to your circumstances.
Understanding how much you could borrow is important, but understanding what works for your lifestyle is just as valuable.
Looking for mortgage advice in Gloucestershire?
At Hannah Miller Homes, we help people understand their mortgage borrowing options and make informed decisions about their next home.
With 15 years of experience in financial services and the mortgage industry, Hannah understands how different lenders assess mortgage applications and why borrowing amounts can vary.
Based in Gloucestershire, we support first-time buyers, home movers and homeowners across Gloucester, Cheltenham, Stroud, the Cotswolds and throughout the UK.
Whether you're ready to start viewing properties or simply want to understand what's possible, we're here to help you explore your options.
Bring your plans, I'll help with the rest.
Your home may be repossessed if you do not keep up repayments on your mortgage.