How Much Can I Actually Borrow as a First-Time Buyer?

Right, the big question.
How much mortgage can you actually get?
You’ve probably heard the rumour. “Lenders just do salary times four.” Or four-and-a-half.
Nice idea. Not true.
Your income matters, sure. But lenders also look at your spending, your debts, your
commitments, even how long you want the mortgage for.
Let’s break it down properly.

What’s an “income multiple”?

It’s just your income times a number, to estimate borrowing.
Say you earn £40,000:
4 × £40,000 = £160,000
4.5 × £40,000 = £180,000
Two of you buying together, each earning £30,000? Combined that’s £60,000:
4 × £60,000 = £240,000
4.5 × £60,000 = £270,000
Handy for a rough idea. Not a promise. Some people get offered more. Some get less. It
depends.

So why can’t I just do the maths myself?

Because lenders don’t just want to know what you earn. They want to know what you can actually afford. Every lender has its own way of working this out. So the same two people, same income, same everything — one lender says yes to a bigger number, another says no. That’s just how it works.

What counts as “income”?

Depends who you ask. But it could include:
Basic salary
Regular overtime
Bonuses
Commission
A second job
Self-employed income
Pension income
Certain benefits
Here’s the catch: not every lender treats these the same way. One might barely count your
bonus. Another might count it fully. Annoying, but true.

Do my debts drag down what I can borrow?

Yep. They can.
Things like:
Personal loans
Car finance
Credit card balances
Hire purchase
Maintenance payments
Childcare costs
Any other regular commitment
Picture this. Buyer A earns £40k, no debts. Buyer B earns £40k too, but has a chunky car
finance payment and a loan.
Same salary. Different story when it comes to what they can borrow.
That’s the whole point. Salary alone tells you nothing.

Does having a credit card wreck my chances?

No. Having a credit card is fine. But your balance, and whether you’re paying it off properly, that gets looked at. Your credit history in general matters too.

What about student loans?

Yes, that counts too. It eats into your take-home pay, so lenders factor it in. How much depends on the lender

Kids. Do they change anything?

They can. Dependants and childcare costs are part of the affordability picture. Doesn’t mean having kids blocks you from a mortgage. It just means “salary times four” was never the full story to begin with.

Does the mortgage term matter?

Yes, and here’s the trade-off.
Longer term = smaller monthly payments. Feels easier now.
But longer term also = more interest paid overall. Costs you more in the long run.
Your age and the lender’s own rules can also limit which terms you’re even offered.

Buying with someone else?

If you’re going in together, the lender looks at both incomes. Good.
But they also look at both sets of debts and commitments. So:
Income 1 + Income 2 ≠ automatic bigger mortgage.
The lender still runs the full affordability check on you both, together.

Okay, so what can I actually afford?

Two pieces: your mortgage, plus your deposit.
Example:
Mortgage: £225,000 Deposit: £25,000 = £250,000 house
But don’t forget the extra costs — solicitors, surveys, moving. Don’t throw every last pound
at the deposit.

Just because you CAN borrow it, doesn’t mean you SHOULD

This one trips people up constantly. Lender says you can have £250,000? Great. Doesn’t mean you should take it. Think about what’s left over for:

Council tax
Gas and electricity
Water
Home insurance
Food
Transport
Repairs and maintenance
Savings
Just… living your life
You want breathing room. Not a mortgage that swallows everything.

How do I get a proper answer, not just a guess?

Online calculators are a fine starting point. But for something real, talk to a mortgage adviser. They’ll actually look at your income, your commitments, your situation — and check it against real lender criteria. And remember: even that isn’t a guarantee. It’s still not a formal offer. The lender checks everything properly later, including the actual property.

Quick-fire FAQs

Can I borrow 4.5 times my salary? Maybe. Some calculations land there. But nobody’s entitled to it automatically. Depends on you, and the lender.

Can I get five times my salary? Possible in some cases. Don’t assume it though, just because your income looks good on paper.

Does a bigger deposit mean I can borrow more? It lowers your LTV, which can open up better deals. But your maximum borrowing is still about affordability, not just deposit size.

If I pay off my debts, can I borrow more? Maybe. But don’t rush to clear debt purely to impress a lender without thinking about your wider finances first.

What’s the best way to actually find out my number? Rough calculator first. Then dig into your real situation before you lock in a property budget.

The real question

Stop asking “what’s my salary multiple?”
Start asking:
“How much could I borrow, and how much would I actually be comfortable paying
back?”
Two very different questions. Only one of them matters long-term.

This is general info, not personal financial advice. Lending criteria vary by lender and by person. Your home may be repossessed if you don’t keep up mortgage repayments.

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