A £100,000 mortgage is a home loan of one hundred thousand pounds. Monthly repayments depend on the interest rate and term — at 4.5% over 25 years, you'd pay approximately £556 per month, and you'd typically need a salary of £18,000–£25,000.
£100k Mortgage Monthly Repayments
Your monthly repayments on a £100,000 mortgage depend on two key factors: your interest rate and your mortgage term. Here's what you'd pay at different rates:
| Interest Rate | 25 Years | 30 Years | 35 Years |
|---|---|---|---|
| 3.5% | £500 | £449 | £413 |
| 4.0% | £528 | £477 | £443 |
| 4.5% | £556 | £507 | £474 |
| 5.0% | £585 | £537 | £505 |
| 5.5% | £614 | £568 | £537 |
These figures are for repayment mortgages. Interest-only would be lower monthly but you'd need a plan to repay the capital.
What Salary Do You Need for a £100k Mortgage?
Most UK lenders use an income multiple of 4–4.5× your annual salary. Here's how that breaks down:
| Income Multiple | Salary Needed |
|---|---|
| 4× income | £25,000 |
| 4.5× income | £22,222 |
| 5× income | £20,000 |
| 5.5× income | £18,182 |
Some lenders — particularly for NHS staff and teachers — offer enhanced income multiples up to 5.5–6×.
Deposit Requirements
Your deposit size determines both your loan-to-value ratio and the interest rates available to you:
| Property Value | 5% Deposit | 10% Deposit | 15% Deposit |
|---|---|---|---|
| £105,000 | £5,250 | £10,500 | £15,750 |
| £111,000 | £5,550 | £11,100 | £16,650 |
| £120,000 | £6,000 | £12,000 | £18,000 |
The bigger your deposit, the better the rates you'll access. The best deals typically start at 75% LTV (25% deposit).
Speak to a Fee Free Mortgage Adviser
Get expert, whole-of-market advice — it costs you nothing. We'll find the right deal for your situation.
Total Cost Over the Mortgage Term
Here's how much a £100k mortgage costs in total including interest:
| Rate | 25 Years Total | Total Interest |
|---|---|---|
| 3.5% | £150,000 | £50,000 |
| 4.5% | £166,800 | £66,800 |
| 5.5% | £184,200 | £84,200 |
Even a 1% rate difference saves you £17,000+ over the life of the mortgage. That's why using a fee-free broker who searches the whole market is so important.
Get Fee-Free Advice on Your £100k Mortgage
Whether you're a first-time buyer or remortgaging, we'll find the best £100k mortgage deal from 90+ lenders — completely free.
Frequently Asked Questions
- How much is a £100k mortgage per month?
- At 4.5% interest over 25 years, a £100k mortgage costs approximately £556 per month. At 4.0% it's around £528, and at 5.0% it's about £585.
- What salary do I need for a £100k mortgage?
- Most lenders offer 4–4.5× your income. So you'd need £22,000–£25,000. Some specialist lenders go up to 5.5×, meaning £18,200 could be enough.
- Can I get a £100k mortgage on a £20k salary?
- Yes — at 5× income, some lenders would offer £100k. A whole-of-market broker can identify which lenders will stretch to this multiple for your circumstances.
- How much deposit do I need for a £100k mortgage?
- If the property is worth £111,111, a 10% deposit would be £11,111. With a 5% deposit scheme, you'd need as little as £5,556.
Need Expert Advice?
Speak to one of our mortgage advisors for free, personalised guidance.
Get Your Free Quote