£100,000 mortgage calculator
Monthly repayments, total interest and deposit scenarios for a £100,000 UK mortgage.
Quick start — mortgage amount
How much can you borrow?
Typical borrowing (4.5× income)
£247,500
Max property price
£247,500
Some lenders stretch to 5× (£275,000) if income is over £75k or debt-free.
Monthly repayment
Loan £100,000 · LTV 100% (rates rise sharply above 90% LTV)
Monthly payment
£507
Total interest over term: £82,407
If the rate changes
Notes
- 4.5× income is the standard FCA/PRA cap. Lenders can lend 15% of new loans above 4.5×, so a small number stretch to 5–5.5× for high earners.
- LTV bands typically price at 60%, 75%, 80%, 85%, 90% and 95%. Crossing a band down can save 0.3–0.6% on the rate.
- Stress test: most lenders assume rate = product rate + 1% for affordability.
- This is an estimate. Speak to an FCA-authorised broker for a decision in principle.
How much does a £100,000 mortgage cost?
On a 25-year repayment mortgage at 4.5%, a £100,000 mortgage costs around £556 a month, with £66,750 of interest over the full term. The figures below update automatically for different rates, terms and deposit sizes.
Monthly repayments on a £100,000 mortgage
| Rate | 15 yrs | 20 yrs | 25 yrs | 30 yrs | 35 yrs |
|---|---|---|---|---|---|
| 4.0% | £740 | £606 | £528 | £477 | £443 |
| 4.5% | £765 | £633 | £556 | £507 | £473 |
| 5.0% | £791 | £660 | £585 | £537 | £505 |
| 5.5% | £817 | £688 | £614 | £568 | £537 |
| 6.0% | £844 | £716 | £644 | £600 | £570 |
Total interest on a £100,000 mortgage
- 15-year term at 4.5%£37,699 interest · £137,699 repaid
- 20-year term at 4.5%£51,836 interest · £151,836 repaid
- 25-year term at 4.5%£66,750 interest · £166,750 repaid
- 30-year term at 4.5%£82,407 interest · £182,407 repaid
- 35-year term at 4.5%£98,768 interest · £198,768 repaid
Shortening the term on a £100,000 mortgage from 35 to 25 years saves roughly £32,018 in interest.
Example scenarios for a £100,000 mortgage
- 5% deposit: buy at about £105,263 with a £5,263 deposit — 95% LTV, around £556/month at 4.5%.
- 10% deposit: buy at about £111,111 with a £11,111 deposit — 90% LTV, around £556/month at 4.5%.
- 15% deposit: buy at about £117,647 with a £17,647 deposit — 85% LTV, around £556/month at 4.5%.
- 25% deposit: buy at about £133,333 with a £33,333 deposit — 75% LTV, around £556/month at 4.5%.
- Income needed: most lenders cap at 4.5× income, so a £100,000 mortgage typically needs a household income of about £22,222.
- If rates rise 1%: repayments move from £556 to £614 a month — £58 more.
- Overpaying £100/month: on £100,000 at 4.5% you would clear the loan meaningfully earlier and cut interest — most lenders allow 10% overpayment a year penalty-free.
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Is a £100,000 mortgage affordable?
Lenders typically cap borrowing at 4.5 times household income, so a £100,000 mortgage usually needs an income around £22,222 plus a deposit on top.
- Check the payment at a rate 1–2 points higher than today's — that is your renewal risk.
- A larger deposit moves you into a cheaper loan to value band and cuts the monthly cost.
- Extending the term reduces the monthly payment but adds significantly to total interest.
- Budget stamp duty, legal fees, survey and removals separately from the mortgage.
Frequently asked questions
- How much does a £100,000 mortgage cost per month?
- On a 25-year repayment mortgage at 4.5%, a £100,000 mortgage costs about £556 per month. The table above shows other rates and terms.
- What income do you need for a £100,000 mortgage?
- At the common 4.5x income multiple you would need a household income of roughly £22,222, subject to affordability checks on your outgoings and credit commitments.
- What deposit do I need alongside a £100,000 mortgage?
- A 10% deposit on a purchase funded by a £100,000 mortgage is around £11,111, giving a 90% loan to value. A 25% deposit gets the cheapest rates.
- How much interest will I pay on a £100,000 mortgage?
- Over 25 years at 4.5% you would repay roughly £66,750 in interest on top of the £100,000 borrowed.