Mortgage on a £100,000 salary: how much can you borrow? (UK, 2026)
On a £100,000 salary most UK lenders will lend up to £450,000 — 4.5× income. Combined with a £50,000 deposit that's exactly £500,000 — sitting right at the first-time buyer stamp duty cliff. 5× and 5.5× lenders are within reach.
Income and deposit
Loan terms
Max property budget: £0
Monthly repayment: £0
A guide, not a mortgage offer. Actual lending depends on credit history, regular outgoings, contract type and stress-tested affordability — a broker can sharpen this estimate.
What £100k actually buys
A £100,000 gross salary is roughly £69,200 net (£5,770/month) after income tax and NI in the 2026 tax year. The personal allowance starts being withdrawn at £100,000 — losing £1 of allowance for every £2 of income above. At exactly £100k you keep the full allowance; £125,140+ and it's gone entirely.
| Multiple | Max loan | + £40k deposit | + £50k deposit | + £100k deposit |
|---|---|---|---|---|
| 4.0× (conservative) | £400,000 | £440,000 | £450,000 | £500,000 |
| 4.5× (typical) | £450,000 | £490,000 | £500,000 | £550,000 |
| 5.0× (strong applicants) | £500,000 | £540,000 | £550,000 | £600,000 |
| 5.5× (specialist) | £550,000 | £590,000 | £600,000 | £650,000 |
Source: Mainstream UK lender LTI caps as published in 2026.
The £500,000 stamp-duty cliff
At £100k income with 4.5× multiple and £50k deposit, you reach exactly £500,000 — exactly at the FTB stamp-duty cliff in England. The numbers either side:
- £500,000 main-home (non-FTB): £15,000 stamp duty
- £500,000 first-time buyer: £10,000 stamp duty
- £505,000 first-time buyer: £15,250 stamp duty (relief withdrawn entirely)
If you're a first-time buyer at £100k income, structuring the offer at or below £500,000 is the single highest-leverage decision in the entire purchase. £5,000 of extra cash to push the price to £505,000 costs you £5,250 in incremental stamp duty alone.
Monthly payment on £100k
| Loan | Rate | 25-year monthly | 30-year monthly | % of gross |
|---|---|---|---|---|
| £360,000 | 4.5% | £2,001 | £1,824 | 24% |
| £450,000 | 4.5% | £2,501 | £2,280 | 30% |
| £500,000 | 4.5% | £2,779 | £2,533 | 33% |
| £550,000 | 4.5% | £3,057 | £2,786 | 37% |
| £450,000 | 5.5% | £2,764 | £2,556 | 33% |
| £450,000 | 6.0% | £2,899 | £2,698 | 35% |
The £450,000 line at 4.5% over 25 years sits exactly at 30% of gross. £550,000 (5.5× stretch) pushes 37% — workable but lenders will scrutinise debt commitments closely.
Worked examples
Example 1 — First-time buyer, £100k PAYE, £50k deposit. Eligible at 4.5× → £450,000. Combined budget £500,000. With FTB relief: £10,000 stamp duty. Monthly at 4.5% / 25y: ~£2,501.
Example 2 — £100k + £20k bonus (50% counted) + £100k deposit. Calculable income £110,000. At 4.5× = £495,000 max loan, £595,000 budget. Crosses the FTB cliff: stamp duty becomes £20,500 (full main rates). The bigger deposit and bigger loan combine to put you firmly into the 5% band.
Example 3 — Two doctors, £100k + £80k joint income, £100k deposit. Combined £180k × 4.5× = £810,000 max loan, £910,000 budget. Some lenders offer professional-borrower products at 6× for medics within five years of qualification, which would push to £1,080,000 max loan / £1,180,000 budget.
Why offset mortgages start to matter at £100k
For higher earners with £30,000+ in savings, an offset mortgage nets savings against the mortgage balance — you pay interest only on the difference. At a 4.5% mortgage rate and 40% income tax on savings interest, an offset typically beats holding savings in a regular account by 1–2 percentage points net.
Offset mortgages don't change how much you can borrow — they change the economics once you have the loan. Worth modelling with a whole-of-market broker if you're carrying a mid-five-figure cash buffer.
Where Offrly fits
At £500,000+ you're shopping in a band where similar properties on similar streets vary 15–20% in asking price — driven by garden quality, kitchen age, finish level and a hundred small things estate agents don't quantify. Offrly's AI reads each comparable's photos (garden, condition, layout, finish) and hyperlocal pricing resolves prices to the street rather than the postcode — in about 30 seconds. Free. No email.
Other mortgage calculators: On £30k salary · On £40k · On £50k · On £60k · On £80k · Joint income (£60k+£40k) · Self-employed · First-time buyer · Head calculator
Disclaimer: This calculator is for illustration only. Not a mortgage offer and not financial advice. Actual lending depends on your full financial profile, credit history, regular outgoings and the lender's stress-tested affordability model. For a real decision in principle, speak to a whole-of-market broker or a lender directly.
FAQ: Mortgage on a £100,000 salary: how much can you borrow? (UK, 2026)
How much mortgage can I get on a £100,000 salary?
Most UK lenders cap residential mortgages at 4.5× gross income — so £450,000 on a £100,000 salary. A larger group of lenders will lend 5× (£500,000), and specialist 5.5× (£550,000) products are common at this income. Professional borrowers (medics, lawyers, accountants, dentists) often access 6× products. Source: Bank of England financial stability data and FCA mortgage market guidance 2026.
What property price can I afford on £100k?
Loan + deposit. With a £50,000 deposit and 4.5× multiple you reach £500,000 — exactly at the FTB stamp-duty cliff in England. With £100,000 deposit (20% on £550,000) you reach £550,000. Stamp duty at £500k is £15,000 (or £10,000 with FTB relief, only if you stay at exactly £500k or below).
What's the monthly payment on a £450,000 mortgage at £100k?
Around £2,501/month on a 25-year repayment mortgage at 4.5%. That's exactly 30% of gross monthly income (£8,333/mo), well within the 40% stress-test ceiling. Stretch to 30 years and the monthly drops to about £2,280 — but you pay £65,000+ more in interest over the life.
How does the additional rate income tax band affect mortgage applications?
Mortgage lenders use gross income, so the 45% additional rate (which kicks in at £125,140 in 2026) doesn't directly change borrowing capacity. Indirectly, higher tax means lower net cash flow per pound of headline income — affordability stress tests look at net spending capacity, so a £100k earner who's lost personal allowance from £100k–£125k may stress-test slightly tighter than a £95k earner in some lender models.
Should I consider an offset mortgage at this income?
Often yes. Higher earners with £30k+ in savings can use an offset mortgage to net savings against the mortgage balance — paying interest only on the difference. Saves more interest than putting savings in a typical account, especially relevant when savings interest is taxed at 40% and the mortgage rate is similar. Worth comparing with a whole-of-market broker.