What Salary Do I Need for a £300,000 Mortgage in the UK (2026)?

The core calculation: how much salary for £300k?

The starting point for every UK mortgage application is the income multiple — the lender multiplies your gross annual salary by a figure, typically 4 to 4.5, to arrive at the maximum loan.

Working backwards from £300,000:

For most people on standard employment, the realistic target is a salary of £66,667–£75,000 to access £300k from a mainstream lender.

Which lenders go above 4.5×?

Not all lenders are equal. A growing number offer enhanced multiples — but usually only under specific conditions.

Professional mortgages are a genuine route for NHS staff, doctors, dentists, vets, solicitors, chartered accountants and architects. If you qualify, a 5× multiple means you only need a £60,000 salary for £300k.

What counts as income?

• Basic salary: counted in full.
• Bonuses: typically 50–100%, averaged over 2–3 years.
• Overtime: 50–100% of regular overtime (lenders discount unpredictable amounts).
• Commission: similar treatment to bonuses.
• Investment income / rental income: varies by lender; usually needs 2yr track record.
• Universal Credit / Child Benefit: some lenders accept these as secondary income.

The stress test: often the real constraint

Even if you pass the income multiple, lenders must stress-test your affordability under the Mortgage Charter obligations. They model whether you could still meet repayments if rates were significantly higher.

In 2026, most lenders test at a floor rate of 7–9% or at your revert rate (Standard Variable Rate) plus 1–2 percentage points.

Worked example — stress test in action:

Sophie earns £70,000. At 4.5×, she qualifies for £315,000 on paper. She applies for £300,000 on a 5-year fix at 4.5%.

Monthly payment at 4.5%: £1,634/month Monthly payment at stress-test rate of 8.0%: £2,289/month

Sophie's take-home pay is £48,290/year = £4,024/month. At the stress-test rate, repayments = 56.9% of net income — above most lenders' 50–55% ceiling. The lender may reduce the offer to £250,000–£260,000.

This is why your headline salary alone doesn't guarantee £300k. Other debts — car finance, credit cards, personal loans — reduce what the lender will offer even further. Every £200/month of existing debt repayments can cut borrowing by £20,000+.

Joint applications: the most practical route

For many buyers, the most realistic path to a £300k mortgage is a joint application. Lenders combine both applicants' incomes.

A couple earning £50,000 and £35,000 combined has more than enough capacity for a £300k mortgage at standard multiples — and with a reasonable deposit, could stretch to properties worth £350,000+.

Worked example: single buyer on £70,000

Let's run the full numbers for a single applicant earning £70,000 gross in 2026/27.

Step 1 — Borrowing capacity

• 4.5× income: £315,000 maximum
• Target loan: £300,000 ✓

Step 2 — Take-home pay

On a £70,000 salary in 2026/27 (England, no other deductions):

• Personal allowance: £12,570
• Basic rate (£12,571–£50,270): 20% = £7,540
• Higher rate (£50,271–£70,000): 40% = £7,892
• National Insurance: approx £4,568
• Net annual income: ~£49,500 = £4,125/month

Step 3 — Monthly repayment at 4.5% over 25 years

£300,000 mortgage at 4.5% over 25 years = £1,634/month

As a percentage of net income: £1,634 ÷ £4,125 = 39.6% — within most lenders' 40–45% affordability ceiling.

Step 4 — Deposit requirement

Assuming 10% deposit on a £333,333 property: £33,333 deposit needed.

Step 5 — Stamp duty (first-time buyer in England)

At £333,333:

• FTB relief: 0% on first £300,000 = £0
• 5% on £33,333 = £1,667 SDLT

Total upfront cost estimate: £33,333 deposit + £1,667 SDLT + £2,500 legal/survey fees = **£37,500**.

How deposit size affects the deal

A larger deposit doesn't just reduce your loan — it unlocks better interest rates, which meaningfully reduces your monthly costs.

Moving from a 5% to a 10% deposit saves roughly £307/month on a £300k purchase — around £3,684/year, or £92,000 over a 25-year term in total interest and payment differences.

First-time buyer stamp duty position in 2026

The first-time buyer SDLT relief threshold reverted to £300,000 in April 2025 (down from £425,000). This matters for £300k+ properties.

If you're buying jointly with someone who already owns property, the non-FTB thresholds apply — and there may be a 3% surcharge on additional dwellings if one partner is a second-time buyer. Plan carefully.

Self-employed borrowers: what lenders need

Getting a £300k mortgage as a self-employed applicant is absolutely achievable, but the evidence requirements are stricter.

What lenders want:

• 2–3 years of SA302 forms (HMRC tax calculations) plus Tax Year Overviews
• Most lenders average the last 2 years' profit; some use the lower of the two
• If you're a limited company director: lenders typically look at salary + dividends; some add net profit back in
• A minimum of 10% deposit (some lenders require 15–20% for self-employed)
• Clean credit history — especially important when your income looks irregular

Good news: A growing number of lenders — including Halifax, Santander and Nationwide — have specialist self-employed underwriting. If year 2 profit is higher than year 1, some will use the more recent year.

Fixed vs tracker: choosing the right product

In 2026, the most common rate types for a £300,000 mortgage:

A 5-year fix gives the most certainty and is typically the most popular choice in 2026. If you believe the Bank of England will cut rates further over the next 2–3 years, a 2-year fix or tracker may eventually work out cheaper — but you accept the risk of higher rates in the interim.

Getting a Mortgage in Principle (MIP)

Before making any offer on a property, you'll need a Mortgage in Principle (also called an Agreement in Principle or Decision in Principle). This is a conditional indication from the lender of how much they'd offer, subject to full underwriting.

• Takes 15–60 minutes online with most major lenders
• Usually a soft credit search (no impact on credit score) — confirm before applying
• Valid for 60–90 days typically
• Does not guarantee the final mortgage offer — full underwriting may uncover issues

Estate agents routinely ask for an MIP before accepting offers. Having one ready signals you're a serious buyer.

What won't help (common mistakes)

1. Making multiple MIP applications in quick succession — hard credit searches stack up and can temporarily lower your score.
2. Applying with new credit accounts — opening a credit card or car loan in the 6 months before application raises red flags.
3. Overstating income — lenders verify with payslips and employer references. Any discrepancy kills the application.
4. Forgetting small debts — even a £500 balance on a store card must be declared and reduces your offer marginally.

Shared Ownership: an alternative route

If £300k is out of reach on your salary alone, Shared Ownership lets you buy 25–75% of a property and pay subsidised rent on the rest.

• Lower deposit needed (5% of the share, not the full price)
• Buy more shares over time ("staircasing")
• Available on new-build and some resale properties via housing associations
• Combined income cap: usually £90,000 (£80,000 outside London)

This can be an effective stepping stone, though it comes with restrictions on selling and subletting.

Sources

• Bank of England: Base Rate decisions
• FCA: Mortgage affordability rules
• HMRC: Stamp Duty Land Tax
• gov.uk: Shared Ownership
• gov.uk: Mortgage Guarantee Scheme