How Much House Can I Afford on My Salary?

On a £35,000 salary, you could typically afford a mortgage of around £105,000–£140,000, depending on your deposit and the interest rate you qualify for. But "can afford" and "should borrow" are two different things. The difference between a carefully considered mortgage and one that stretches you to breaking point can cost you tens of thousands of pounds—and potentially your home. This guide walks you through the rules lenders use, the real numbers that work, and how to stress-test your budget so you don't overextend.

The 28/36 Rule — Your Starting Point

Lenders use a simple ratio to work out how much house you can afford on your salary. The 28/36 rule is the industry standard:

28% rule: Your monthly mortgage payment should not exceed 28% of your gross monthly income.
36% rule: All your debt payments (mortgage, car loan, credit card minimums, student loan) should not exceed 36% of your gross income.

Take a £45,000 salary. That's £3,750 gross per month. At 28%, your affordable mortgage payment is £1,050/month. At 5% interest over 25 years, that payment supports roughly a £200,000 mortgage.

The 28/36 rule is a floor, not a ceiling. Many lenders will lend up to 4.5x your annual salary — on £45,000, that's £202,500. But lenders are incentivised to lend as much as possible. You need to ask yourself a harder question: can you afford it? And more importantly, should you?

Use our house affordability calculator to plug in your salary and see what the numbers suggest. But read on first — knowing how the sums work out helps you make better choices.

Real-World Example: A First-Time Buyer's Budget

Let's walk through a realistic scenario. Imagine a 28-year-old earning £35,000 with £15,000 saved, buying a £200,000 flat in Manchester.

With a 7.5% deposit (£15,000), she takes a 92.5% LTV mortgage of £185,000. At 5.4% fixed for 5 years over 30 years, her monthly payment is £1,038. Stamp duty is £0 because first-time buyers are exempt up to £425,000.

But the mortgage payment isn't the full picture. Add in:

Service charge and buildings maintenance: £80/month
Council tax (Band B): £120/month
Buildings insurance: £30/month
Utilities, contents insurance, maintenance buffer: £150/month

Total monthly housing cost: roughly £1,420. Her take-home on £35,000 (after tax and National Insurance at 2026 rates) is about £2,720/month. Housing costs are 52% of her take-home.

Is that workable? It depends. If she has no other debt, a stable job, an emergency fund, and a partner's income to fall back on, maybe. If she's got a £200 car payment, student loan, and no savings, that's risky. The 28% rule would suggest she should only borrow £77,000. But real life is messier than a formula. That's why calculating mortgage affordability properly means stress-testing your actual numbers, not just relying on lender formulas.

Hidden Costs That Blow Your Budget

Your monthly payment isn't your only cost. First-time buyers often overlook the extras that add thousands to your true cost:

Arrangement fees: Lenders charge £500–£2,000 to set up your mortgage. That's typically added to the loan, so you pay interest on the fee too.

Valuation and survey: £300–£600. Your lender requires a valuation; you should get a full survey to spot structural issues before you're committed. Skipping the survey to save £300 on a £200,000 house is like refusing a health check because you can't afford the appointment.

Legal and conveyancing: £800–£1,500 plus disbursements (Land Registry, local searches, etc.). Shop around — the difference between the cheapest and most expensive is often £400+.

Stamp Duty Land Tax: First-time buyers pay nothing up to £425,000. After that, rates climb: 5% from £425k–£625k, 10% from £625k–£1.5m, 12% above £1.5m. On a £450,000 house, you'd pay 5% on the £25,000 over the threshold = £1,250.

Buildings insurance: Required by your lender, typically £300–£600/year depending on property value and location.

Moving, redecoration, emergency repairs: Budget at least 1% of the property value. A 20-year-old boiler, dodgy electrics, or a roof leak can cost £5,000–£15,000 within your first year. Many first-time buyers don't discover these until after completion.

The deposit also matters more than most people realise. A 10% deposit locks you into worse rates — typically 0.5–1% higher than someone with 20% down. On a £200,000 mortgage, that difference is £80–160/month. Over 5 years, that's £4,800–9,600 extra interest. If you can afford to save longer and reach 15–20%, the lower rates pay for themselves. This guide on saving for a deposit walks through the trade-off: is it better to buy sooner at a higher rate, or wait?

Common Affordability Mistakes

Borrowing the maximum the lender offers. Just because a lender will offer 4.5x your salary doesn't mean you should take it. Stress-test: what happens if interest rates rise 2% (from 5% to 7%), or if your partner loses their job? Can you still make the payment?

Ignoring early repayment charges (ERCs). If you might move or remortgage within your fix, check the ERC. It's typically 1–5% of the outstanding balance — on a £200,000 mortgage, that's £2,000–£10,000. A 3% ERC could wipe out your savings from switching to a lower rate.

Not shopping around. The difference between the best and worst mortgage rate is often 0.5–1.5%. On a £200,000 mortgage, that's £80–240 per month, or nearly £3,000 over 5 years. Use a whole-of-market broker or compare at least 5 lenders.

Choosing the wrong mortgage type for your situation. Interest-only mortgages have lower monthly payments but leave you owing the full amount at the end — only viable if you have a concrete plan to repay the capital. Fixed rates lock in certainty but cost more upfront; variable rates are cheaper now but risky if interest rates rise.

Stretching to buy in an overheated market. If everyone in your price bracket is skint, that's a signal the market's pricing in a crash risk. Save a few more months, or look at a slightly cheaper property or different area. Overpaying because you're scared to miss out is how people end up in negative equity.

Stress-Test Your Budget: The Questions to Ask

Before you commit to a mortgage, sit with a spreadsheet and ask yourself these:

What if rates rise 2%? Calculate your new payment (most mortgage calculators have a "stress test" feature). Can you still pay bills, eat, and save?
What if my income drops? Job loss, illness, or reduced hours happen. Could your partner's income alone cover the mortgage, or do you have savings to bridge the gap?
What if the boiler dies? Do you have an emergency fund separate from your deposit? Most financial advisors recommend 3–6 months of living expenses in savings before you buy.
What if my commute changes? A job loss or relocation might force you to sell before your mortgage is due. Could you break even, or would early repayment charges and selling costs wipe out your deposit?
Am I comfortable living in this house for at least 5 years? Buying and selling costs roughly 8–10% of the property value. You need at least 5 years of appreciation and mortgage paydown to break even.

Use our mortgage calculator to run these scenarios with real numbers. Or, if you're a first-time buyer, work through that guide first — it covers the specifics of your situation.

Frequently Asked Questions

Q: How much house can I afford on a £40,000 salary?

A: Using the 28% rule, you can afford a mortgage payment of roughly £933/month. At 5% interest over 25 years, that's a mortgage of roughly £175,000. If you have a 10% deposit (£19,500 saved), you could buy a £195,000 property. But affordability isn't just about the lender's rules — stress-test your budget for rate rises and income drops. Many people on £40,000 comfortably borrow £150,000; others stretch to £200,000 and regret it.

Q: Should I borrow the maximum the lender offers?

A: No, not automatically. A 4.5x mortgage is the ceiling many lenders will offer, not a recommendation. If you're on a stable income with no dependents and low existing debt, 4.5x might work. But if your income is variable, you have kids, or you have other debts, aim for 3–3.5x. The difference between 4x and 4.5x salary might be technically affordable, but it leaves you vulnerable to rate rises or income shocks.

Q: Does a larger deposit mean a cheaper mortgage?

A: Yes, both the interest rate and your monthly payment drop. A 10% LTV typically costs 0.5–1% more than a 20% LTV. On a £200,000 mortgage over 25 years, that's a difference of roughly £1,000–2,000 per year. But a larger deposit means more time saving, so there's a trade-off: is it worth waiting another 2 years to save 10% more, or should you buy sooner at a higher rate?

Q: What's the difference between a mortgage I can afford and one I should take?

A: The lender's affordability model is based on your income and existing debt — it assumes you spend nothing on unexpected costs, rate rises, or emergencies. Your personal affordability should be tighter. Aim to use no more than 30% of your take-home on housing if possible, and always keep an emergency fund equal to 3–6 months of expenses separate from your down payment. If you're hitting 35–40% on housing costs, you're likely to feel the strain when anything goes wrong.

Q: What if I'm offered an interest-only mortgage?

A: The monthly payment is lower — on a £200,000 mortgage at 4.5%, interest-only is £750/month vs £1,111 on a repayment mortgage. But you still owe the full £200,000 at the end of the term. Lenders typically won't offer interest-only unless you can prove you have a plan to pay off the capital (savings, pension drawdown, etc.). And if your plan doesn't pan out, you're in trouble.

Q: How do I know if I'm overstretching?

A: Red flags: housing costs are more than 35% of your take-home; you have less than £500/month left after housing and debt payments; you can't build an emergency fund; you lose sleep worrying about rates rising. If any of these apply, you're probably overstretching. A good mortgage should feel like a commitment, not a noose.

Q: Should I get a guarantor or use a family member's money for a larger deposit?

A: It's tempting, but risky. A guarantor co-signs the mortgage, meaning they're legally liable if you can't pay. If you miss payments, their credit score suffers. If you default, they could lose their own home. Only do this if your guarantor fully understands the risk. Using family money as a gift is cleaner — but make sure it's genuinely a gift, not a loan, or lenders may count it as debt against you.

Next Steps

Start with our house affordability calculator, which factors in the deposit, interest rate, term, and hidden costs so you see the real picture. Then read through how to calculate your mortgage affordability in detail — that guide walks you through the 28/36 rule step by step and shows you how to adjust it for your actual situation.

If you're still saving, this timeline guide for house deposit saving shows how long it realistically takes and how to accelerate your savings. And once you're ready to compare deals, understand the difference between fixed and variable rates so you're not caught out when your fix ends.

Finally: a good mortgage broker is worth their fee. They can run hundreds of scenarios instantly and find deals you wouldn't qualify for alone. If you're buying, get advice.