A £100,000 mortgage is one of the most common loan amounts in the UK, particularly for first-time buyers outside London or those purchasing smaller properties. Your monthly payment depends on three things: the loan amount, your interest rate, and how long you're borrowing for. Use the calculator below to get an instant figure.
£100,000 mortgage calculator
£100k mortgage monthly payment examples
Not sure what rate to enter? The table below shows typical monthly repayment amounts on a £100,000 mortgage across common interest rates and term lengths, based on a standard repayment mortgage.
| Interest rate | 20-year term | 25-year term | 30-year term |
|---|---|---|---|
| 3.5% | £580 | £501 | £449 |
| 4.0% | £606 | £528 | £477 |
| 4.5% | £633 | £556 | £507 |
| 5.0% | £660 | £585 | £537 |
| 5.5% | £688 | £614 | £568 |
| 6.0% | £716 | £644 | £600 |
| 6.5% (typical SVR) | £745 | £675 | £632 |
Figures are approximate and for illustrative purposes only. Based on a capital repayment mortgage.
What affects your monthly payment on a £100k mortgage?
There are three main levers that determine what you'll pay each month:
Interest rate
Even a 0.5% difference in rate can change your monthly payment by £25–£30 on a £100k mortgage. Fixing your rate gives you certainty; a tracker follows the Bank of England base rate up and down.
Term length
Spreading £100,000 over 30 years rather than 25 lowers your monthly cost but means you'll pay more interest in total. A shorter term saves money overall, as long as the payments are affordable.
Repayment type
A repayment mortgage reduces your balance each month and clears the debt by the end of the term. Interest-only keeps your payments lower but the full £100,000 still needs to be repaid at the end — you'll need a solid plan for that.
What salary do you need for a £100,000 mortgage?
Most UK high street lenders apply an income multiple of 4 to 4.5 times your gross annual salary. That means you'd typically need to earn somewhere between £22,000 and £25,000 per year to qualify for a £100k mortgage on your own.
If you're applying jointly, lenders usually combine both incomes before applying the multiplier — so two salaries of £15,000 each could comfortably support a £100,000 application. That said, affordability checks go beyond income; lenders will also look at your outgoings, credit history, and existing debt commitments.
Use our mortgage affordability calculator to see how much you might be able to borrow based on your income.
Real UK scenarios: £100,000 mortgage
First-time buyer in the North East
A buyer in Sunderland purchases a two-bedroom terrace for £110,000 with a 10% deposit (£11,000), leaving a £99,000 mortgage. At 4.5% over 25 years on a repayment basis, monthly repayments come to approximately £550. Adding council tax and utility bills, total monthly housing costs sit around £900–£1,000 — well below renting an equivalent property in the area.
Remortgaging in Wales
A homeowner in Swansea has £97,500 remaining on their mortgage after 8 years. Their fixed rate expires and they remortgage onto a new 2-year fix at 4.3% over the remaining 17 years. Monthly payments fall from £660 to around £610. They continue paying £660 per month voluntarily, clearing the loan months ahead of schedule and saving hundreds in interest.
Shared Ownership buyer
A buyer purchases a 60% share of a £165,000 new-build (mortgage: £99,000, 10% deposit waived through Help to Buy). At 4.5% over 25 years, repayments are approximately £550/month. Rent on the remaining 40% share adds around £220/month, bringing total monthly housing cost to £770 — substantially below the full-market rent in the same development.
Scenarios are illustrative. Rates and costs vary by lender and individual circumstances.
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Frequently asked questions
What is the monthly payment on a £100,000 mortgage?
At 4.5% interest over 25 years on a repayment basis, you'd pay around £556 per month. At 5% the figure rises to approximately £585, and at 6% to around £644. Use the calculator above for a figure based on your specific rate.
How much deposit do I need for a £100k mortgage?
The minimum deposit most lenders accept is 5%, which on a £100,000 mortgage means at least £5,000. In practice, putting down 10% or more gives you access to lower rates and reduces your monthly payment. A 10% deposit on a £100k mortgage is £10,000.
Can I get a £100k mortgage on a low income?
Yes, potentially. Some lenders offer higher income multiples for professionals or first-time buyers, and government schemes like Shared Ownership can help if a standard mortgage is out of reach. A mortgage broker can help you find lenders that are more flexible on affordability.
Is a 25-year or 30-year mortgage better for a £100k loan?
A 25-year term means you'll pay roughly £56 less per month compared to a 30-year term (at 4.5%), but over a full 25 years you'd save thousands in interest. A 30-year term is better if cash flow is tight in the short term — you can always overpay when your finances allow.
How much total interest do you pay on a £100k mortgage?
Over 25 years at 4.5%, you'd pay approximately £66,800 in interest on top of the £100,000 borrowed — a total repayment of around £166,800. Overpaying your mortgage, even by a small amount each month, can significantly cut the total interest paid.
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DisclaimerThis calculator is for illustrative purposes only and does not constitute financial advice. Figures are estimates and do not account for fees, insurance, or changes in interest rates. Always speak to a qualified mortgage adviser before making any borrowing decisions.
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