How Much Can I Borrow for a UK Mortgage?
"How much can I borrow?" is usually the first mortgage question people ask — and often the one they're least prepared for the answer to.
Your bank might quote one figure. A lender's online tool might show another. A broker might find you something different again. They can all be correct simultaneously, because mortgage affordability isn't a single fixed number — it's a range, shaped by several factors that most online summaries gloss over. Here's what's actually going on.
Start with income multiples
The most widely used starting point is the income multiple: a lender multiplies your gross annual salary by a set number to establish a rough maximum loan.
Most UK high-street lenders use 4.5 times your gross annual income as their working ceiling for the majority of borrowers. Some lenders do offer higher multiples — 5×, 5.5×, or above — to qualifying borrowers, following regulatory changes in 2025 that gave lenders more flexibility. Availability depends on your income level, deposit size, the type of mortgage product, and the lender's own criteria. A whole-of-market broker is the most reliable way to find what's available for your circumstances.
| Annual income | At 4.5× | At 5× | At 5.5× |
|---|---|---|---|
| £30,000 | £135,000 | £150,000 | £165,000 |
| £45,000 | £202,500 | £225,000 | £247,500 |
| £60,000 | £270,000 | £300,000 | £330,000 |
| £80,000 | £360,000 | £400,000 | £440,000 |
For most borrowers without access to these products, 4.5× remains the practical planning figure.
Buying with a partner? Most lenders combine both salaries and apply the income multiple to the total. Two earners at £35,000 each could borrow up to £315,000 at 4.5× — compared to £157,500 on either salary alone. Joint applications make a substantial difference.
Income multiples are just the starting point
The income multiple gives a rough ceiling. What actually determines your offer is a full affordability assessment — a considerably more detailed exercise that lenders are required to carry out under FCA responsible lending rules.
What lenders actually look at
Income — but not all income counts equally
Base salary is counted at 100%. Beyond that, it varies by lender:
- Bonuses and commission — some lenders take 100%, others average over 2–3 years
- Overtime — accepted by many lenders, often at a discounted rate
- Self-employment — most lenders require 2–3 years of accounts; some accept the latest year only
- Rental income — typically counted at 75% of gross rent
Credit score and credit history
This is perhaps the most common reason a borrower receives less than their income multiple would suggest — or is declined entirely. Lenders run a credit check on every application. A poor credit score, missed payments, defaults, or County Court Judgements (CCJs) can dramatically reduce what you're offered, or result in an outright decline regardless of income.
Before applying, it's worth checking your credit file with all three major agencies — Experian, Equifax, and TransUnion. Correcting errors, reducing credit card utilisation below 30%, and avoiding new credit applications in the months before applying are all practical steps that can improve your position.
Committed outgoings
Credit card minimum payments, car finance, personal loans, and student loan repayments all reduce the disposable income lenders assess — directly reducing your offer. Even a credit card with a zero balance can reduce what some lenders offer, because they model potential spend against the credit limit.
Employment history and probationary periods
Many lenders require you to have been in your current role for a minimum of 3–6 months before they will count your income. If you're currently in a probationary period, flag this to your broker before applying.
Dependants
Lenders factor in the cost of children and other dependants. It doesn't disqualify you, but it does reduce the headline borrowing figure.
Age and term
Most lenders cap mortgage terms to end by age 70–75. Starting a mortgage at 45 means a maximum term of around 25–30 years — which raises the monthly payment and can reduce the loan size that passes the affordability assessment.
The affordability stress test: what most buyers don't know about
Alongside the income multiple, lenders assess whether you could still afford your mortgage if interest rates were to rise. This is commonly called a "stress test."
What changed in 2022: Until 1 August 2022, the Bank of England's Financial Policy Committee required all lenders to check that borrowers could afford their mortgage if rates were 3 percentage points higher than the reversion rate. The FPC withdrew this rule entirely, judging that the income multiple cap was sufficient protection on its own.
What applies now: Lenders must still follow FCA responsible lending rules, which require them to assess the impact of likely future interest rate increases on affordability — for a minimum of five years. Many still apply a buffer of 2–3% above their own reversion rate. Others have reduced their margins following FCA guidance issued in 2025 reminding lenders to use the flexibility within the rules.
One important exception: If your mortgage rate is fixed for five years or more, MCOB rules do not require a stress test at all — the rate is locked in. This is one reason why some lenders make their enhanced income-multiple products available only on 5-year or 10-year fixes.
The practical implication: the borrowing cap you hit isn't just about your income — it depends on which lender's stress methodology you're assessed against. A broker who knows the market can identify lenders applying lower margins, which on the same financial profile can unlock meaningfully more borrowing.
💡 Use our Mortgage Affordability Calculator to estimate your borrowing range, including a stress-tested monthly payment figure.
How your deposit affects what you can borrow
Your deposit size directly affects the interest rate you're offered. A bigger deposit means a lower loan-to-value (LTV) ratio, and better rates — which feeds directly into whether you pass the stress test at the higher loan size.
| Deposit | LTV | What to expect |
|---|---|---|
| 5% | 95% | Highest rates; more limited lender choice |
| 10% | 90% | Rates improve meaningfully; wider range of products |
| 15% | 85% | Solid product range; rates closer to best |
| 25% | 75% | Access to most competitive products |
| 40%+ | 60% or below | Best pricing — the lowest tier on most lenders' rate cards |
The overall rate premium between a 5% and 40% deposit can be 0.5–1.5% depending on market conditions. On a £200,000 mortgage, that difference is roughly £60–100 per month — and it also flows directly into whether you pass the affordability and stress tests at a higher loan size.
How to improve what you can borrow
If the figure you're arriving at isn't what you needed, there are practical ways to improve it — but most take time, so it's worth thinking about this well before you start viewing properties.
- Pay down existing debt. Car finance, credit cards, and personal loans are the biggest drags on affordability. Even reducing — not eliminating — them can meaningfully increase what lenders offer.
- Don't take on new credit before applying. A new car loan or 0% credit card taken out in the months before your application can reduce your borrowing capacity. Wait.
- Save a larger deposit. Even moving from 5% to 10% unlocks better rates and a significantly wider choice of lenders.
- Consider a longer term. A 35-year term lowers your monthly payment, which can help you pass the affordability test at a higher loan size. You can always overpay later to reduce the effective term.
- Use a broker. Different lenders treat the same applicant very differently — particularly on things like bonus income, self-employed accounts, or existing debts. A whole-of-market broker knows which lenders' criteria suit your specific situation, and that knowledge can unlock £20,000–£50,000 extra borrowing on an identical financial profile.
Three things to know before you apply
Get a Decision in Principle (DIP) before you view properties. Also called an Agreement in Principle, a DIP is a conditional lending indication that tells you what budget you're working with and signals to estate agents that you're a serious buyer. Most DIPs are valid for 60–90 days. One important caveat: some lenders use a soft credit check for a DIP (no footprint on your file), but others use a hard check. Confirm with the lender before applying.
A DIP is not a mortgage approval. Full approval requires a complete application, credit check, property valuation, and underwriting. Don't treat a DIP as a guarantee.
The number isn't a target. Just because a lender will offer you £300,000 doesn't mean it's prudent to borrow all of it. Leave yourself a buffer for rate rises, life changes, and the running costs of homeownership that tend to surprise first-time buyers.
Saving your deposit: the Lifetime ISA
If you're a first-time buyer building your deposit, the Lifetime ISA (LISA) allows you to save up to £4,000 per year and receive a 25% government bonus — up to £1,000 annually. To use it for a property purchase, you must be buying a home worth £450,000 or less, be a genuine first-time buyer, and the account must have been open for at least 12 months before you use it.
Following the November 2025 Budget, the government published a consultation in early 2026 on replacing the LISA with a new First-Time Buyer ISA. Until then, the current LISA continues to operate under its existing rules. Check the current status on GOV.UK before opening an account or making contribution decisions.
Frequently asked questions
Yes — some lenders do offer higher multiples to qualifying borrowers, particularly following regulatory changes in 2025 that gave lenders more flexibility. Availability depends on your income level, deposit size, the mortgage product type, and each lender's own criteria. Because lenders' approaches vary considerably, a whole-of-market broker is the most effective way to find out what is available for your specific profile.
Significantly. A low credit score, missed payments, or defaults can reduce your offer materially — or lead to a decline regardless of income. Before applying, check your credit file with Experian, Equifax, and TransUnion (each lender uses different agencies). Correcting errors, keeping credit card balances below 30% of their limit, and avoiding new credit applications in the months before you apply are all practical steps that can improve your position.
Yes — indirectly. Student loan repayments reduce your monthly disposable income, which lenders factor into their affordability assessment. The loan balance itself doesn't appear on your credit file like a personal loan, but the monthly repayment does reduce your assessed affordability. The exact impact varies by lender and by your plan type.
Most DIPs are valid for 60–90 days, though this varies by lender. If yours lapses before you find a property, you can usually renew — though some lenders may run another credit check. Always confirm your DIP is still valid before making a formal offer on a property.
Yes. Lenders factor in the cost of dependants when calculating your disposable income. It doesn't disqualify you from a mortgage, but it does typically reduce the maximum offer compared with the same income and no dependants. The precise reduction varies by lender.
Possibly, but it depends on the lender. Many require 3–6 months in your current role before counting the income. Some will accept a new role from day one if it's in the same field at a similar or higher salary. If you're in a probationary period, some lenders will decline until it's passed. Always tell your broker upfront — they can direct you to lenders whose criteria work for your specific situation.
The bottom line
Your maximum borrowing starts with income multiples — 4.5× for most borrowers, with higher multiples available from specific lenders under specific conditions. The real figure is then shaped by your credit history, outgoings, deposit size, the lender's stress methodology, and which product you qualify for. Two people with identical salaries can get very different offers — which is why the broker question is worth asking early.
Work out your borrowing range →
📖 Also worth reading: Stamp Duty Explained 2025/26 — so there are no surprises on upfront costs. And our Mortgage Repayment Guide to understand what your monthly payment will actually mean.