How Lenders Work Out How Much You Can Borrow for a Mortgage
Lenders don’t simply multiply your salary. They look at what comes in, what goes out and whether you could still pay if rates rose.
What to know
- Lenders must check that a mortgage is affordable, looking at income, committed spending and living costs.
- Many lenders cap borrowing at around four to four-and-a-half times income, though some go higher for certain applicants.
- Bank of England rules limit how much lending at 4.5 times income or more happens across the market.
- Your credit history and the size of your deposit affect both whether you’re accepted and the rate you’re offered.
Under the Financial Conduct Authority’s mortgage rules, lenders must check that you can afford the loan, both now and if circumstances change. The amount a lender will offer depends on several factors working together, not just your salary.
Your income
Lenders start with what you earn before tax and how reliable it is.
- Employed: basic salary, plus some or all of regular overtime, bonus or commission.
- Self-employed: usually at least two years of accounts or tax calculations, though some lenders accept one.
- Other income: some lenders count certain benefits, pensions or rental income. Policies vary.
Your outgoings
Lenders look at committed spending such as loan and car finance repayments, credit card balances, childcare and maintenance payments. They also estimate everyday living costs. Expect to provide recent bank statements, which show how your money is actually spent.
Income multiples and the 4.5 times limit
Many lenders lend up to around four to four-and-a-half times income. The Bank of England also limits lending at 4.5 times income or more to around 15% of new mortgages across the market. That keeps higher multiples in short supply, so lenders tend to reserve them for applicants with higher incomes or bigger deposits.
Stress testing your payments
Lenders also check that you could still afford the mortgage if interest rates rose, particularly on shorter fixed-rate or variable deals. Each lender sets its own approach, so the same application can produce different results with different lenders.
Credit history and deposit
Your credit file shows how you’ve handled borrowing. Missed payments, defaults or County Court Judgments can limit your options. Your deposit matters too: a lower loan-to-value usually means better rates and more choice.
| What lenders check | Why it matters | How to prepare |
|---|---|---|
| Income | Sets the starting point | Gather payslips, P60 or tax calculations |
| Outgoings | Reduces what you can afford | Clear or reduce small debts where possible |
| Credit history | Signals how you manage borrowing | Check your credit reports for errors |
| Deposit | Affects risk and pricing | Know your exact figure, including any gifts |
Handy tip
Register on the electoral roll at your current address and check your credit reports with the main agencies before you apply. Correcting an error early is easier than explaining it later.
Good to know
An agreement in principle gives an early indication of what a lender might offer, but it isn’t a guarantee. The full application involves detailed checks and a valuation.
Getting ready to apply
- Add up your regular income and outgoings honestly.
- Check your credit reports and fix any mistakes.
- Work out your deposit and the loan-to-value it gives you.
- Compare deals, or speak to a mortgage adviser who can search the market.
Once you know the rough amount you can borrow, our comparison of fixed, tracker and variable rates helps with the next decision.
Your questions
Can I borrow more than 4.5 times my income?
Some lenders offer higher multiples to certain applicants, often those with higher incomes or larger deposits. Because these loans are limited across the market, they’re less widely available.
Do lenders count overtime and bonuses?
Many count some or all of regular variable income, but policies differ. Lenders usually want evidence that it’s been paid consistently.
Does a joint application mean we can borrow more?
Lenders usually assess combined income and commitments, which can increase the amount available. Both applicants are equally responsible for the whole debt.
This guide explains how UK borrowing works in general terms and isn’t financial advice. Rates, rules and lender criteria change, so check the details with the lender, GOV.UK or the Financial Conduct Authority before you decide. For advice on your own circumstances, speak to an FCA-authorised mortgage or financial adviser. If you borrow against your home, it may be repossessed if you do not keep up repayments.
