A £5,000 pay rise stretches a first-time buyer's budget further than a £20,000 boost to their deposit. That sounds back-to-front — a deposit is cash in hand, a pay rise is not — but it falls straight out of the arithmetic of how a mortgage is sized. This piece works through the two levers, then shows what each one unlocks across 16 UK cities, using median sale prices from HM Land Registry's most recent full year of transactions.
This is general information, not financial advice.
The two levers that set your ceiling
The most a buyer can pay for a home is capped by two things added together:
- The mortgage. Most UK lenders cap borrowing at around 4.5 times household income. That reflects the Bank of England Financial Policy Committee's loan-to-income limit, which restricts how much of a lender's new mortgage lending can sit at or above 4.5× income. Some lenders stretch further for higher earners or specific schemes, and your own limit depends on the lender, the loan-to-value and your wider finances.
- The deposit. The cash you put down on completion.
Put together, that gives a simple identity for the ceiling a buyer can reach:
Price ceiling = (4.5 × household income) + deposit
A household on £45,000 with a £30,000 deposit can borrow up to about £202,500 and add their £30,000, for a ceiling of £232,500.
Pound for pound, income moves the needle 4.5 times further
The identity does something important: it multiplies income by 4.5, but adds the deposit only once. So the two levers are not worth the same:
| Lever | How far it moves your ceiling |
|---|---|
| +£1,000 household income | +£4,500 |
| +£1,000 deposit | +£1,000 |
| +£5,000 income | +£22,500 |
| +£10,000 deposit | +£10,000 |
| +£10,000 income | +£45,000 |
| +£20,000 deposit | +£20,000 |
Read the last two rows together. A £5,000 rise in household income lifts the ceiling by £22,500 — more than a £20,000 deposit top-up would. Every extra pound of income is doing four and a half pounds of work, because it is what the 4.5× multiplier acts on. Every extra pound of deposit does exactly one pound of work.
What that looks like city by city
Here are the 2025 median sale prices for 16 cities across England, from HM Land Registry (standard "sold for full value" transactions of houses and flats):
| City | 2025 median sale price |
|---|---|
| Hull | £142,000 |
| Sunderland | £157,500 |
| Liverpool | £182,500 |
| Bradford | £186,500 |
| Nottingham | £200,000 |
| Newcastle upon Tyne | £205,000 |
| Birmingham | £238,000 |
| Leicester | £242,000 |
| Leeds | £248,000 |
| Manchester | £250,000 |
| Portsmouth | £259,000 |
| Southampton | £260,000 |
| Bristol | £350,000 |
| Brighton & Hove | £412,500 |
| Newham (London) | £450,000 |
| Kensington & Chelsea (London) | £1,165,000 |
Now take that same £45,000 household with a £30,000 deposit and watch which cities come into reach as each lever is pulled:
| Scenario | Income | Deposit | Borrowing (4.5×) | Price ceiling | Cities within reach |
|---|---|---|---|---|---|
| Starting point | £45,000 | £30,000 | £202,500 | £232,500 | 6 |
| + £10,000 deposit | £45,000 | £40,000 | £202,500 | £242,500 | 8 |
| + £20,000 deposit | £45,000 | £50,000 | £202,500 | £252,500 | 10 |
| + £5,000 income | £50,000 | £30,000 | £225,000 | £255,000 | 10 |
| + £10,000 income | £55,000 | £30,000 | £247,500 | £277,500 | 12 |
At the £232,500 starting point the median home is within reach in six cities — Hull through Newcastle. A £5,000 pay rise adds Birmingham, Leicester, Leeds and Manchester (four cities); a £10,000 deposit top-up adds only Birmingham and Leicester (two). And the £5,000 pay rise pushes the ceiling to £255,000 — narrowly ahead of what a £20,000 deposit increase achieves (£252,500). That is the multiplier at work again.
The catch: three things the arithmetic leaves out
The ceiling maths is clean, but it is not the whole picture — and none of the following is a reason to favour one lever over the other. That decision is yours and an adviser's.
- Income has a lender ceiling; deposit does not. Once borrowing is capped at roughly 4.5× income, the only way to raise the ceiling further is more deposit. A buyer who has hit their affordability limit cannot pay-rise their way past it — the extra reach has to come from cash.
- A bigger deposit also lowers your loan-to-value. Moving from, say, a 12% to a 20% deposit shifts a buyer into a lower loan-to-value band, where lenders typically quote lower interest rates (Bank of England, quoted household rates). That reduces the monthly payment on any given loan — a benefit the ceiling identity does not capture.
- If you think in percentages, not cash, deposit multiplies too. Framing the deposit as a fixed share of the price (a target loan-to-value) rather than a fixed cash pot changes the maths, because a larger percentage down supports a larger price on the same borrowing. Most buyers experience saving as "I have £X", which is why the cash-pot version above is the practical one.
There is also everything the purchase price does not tell you: stamp duty, council tax, energy and the rest of the running cost differ from city to city. Two homes at the same price can cost very different amounts to live in. You can see the all-in monthly cost for any address with the Homecost postcode tool — for example, the true monthly cost of a Manchester home.
How these numbers were worked out
The city figures are median sale prices for 2025 drawn from HM Land Registry Price Paid Data — the register of what was actually paid, not asking prices or estimates — covering standard sales of detached, semi-detached, terraced and flat/maisonette homes. The national median across the same set of 778,998 transactions was £295,000. The 4.5× borrowing figure follows the Bank of England Financial Policy Committee's loan-to-income limit; a real offer depends on the lender, deposit, term and credit profile. You can browse more data-led pieces in our market analysis section.
For the wider picture, see what salary you need to buy the median home in each UK city, how much deposit you actually need, how long it takes to save a deposit in the cheapest versus dearest cities, and what each £100,000 of mortgage costs per month.
Speak to a qualified mortgage adviser before acting on any of this.