# Is it worth overpaying my mortgage? Calculator UK

URL: https://computenow.co.uk/mortgage-overpayment-calculator/

> See how much interest you save and how much sooner you're mortgage-free by overpaying each month or paying a lump sum.

This calculator shows a worked example below. To use your own figures, add them to the URL as query parameters (listed in https://computenow.co.uk/llms.txt), for example https://computenow.co.uk/mortgage-overpayment-calculator/?<parameter>=<value>.

[What's Left, step 2 of 7: What does my home cost each month?](https://computenow.co.uk/money-plan/#steps)

# Mortgage overpayment calculator

See how much sooner you clear your mortgage, and how much interest you save, by paying extra each month.
Rates checked 18 October 2026
By the ComputeNow team, checked against GOV.UK and HMRC[Sources (2)](#sources)[How we calculate](https://computenow.co.uk/methodology/)

You will be mortgage-free
5 years 8 months
sooner, and save £44,807.92 in interest.

## With and without overpaying

| Item | Without | With £200 |
| --- | --- | --- |
| Monthly payment | £1,332.43 | £1,532.43 |
| Time to pay off | 25 years | 19 yrs 4 mths |
| Total interest | £174,727.66 | £129,919.74 |
| Interest saved |  | £44,807.92 |

This is an estimate, not financial advice. Most deals let you overpay up to 10% of the balance a year without an early repayment charge; check yours.

### Next steps

- [Remortgage calculator](https://computenow.co.uk/remortgage-calculator/?balance=225000&years=25&current=5.13)Check whether a new deal would save more.
[What's Left](https://computenow.co.uk/money-plan/) adds up your monthly figures from each calculator and shows what is left each month.
[You will be mortgage-free 5 years 8 months Breakdown](#result)

## Why overpaying saves so much

Every extra pound goes straight to the balance, so the next month's interest is charged on less. The saving compounds over the remaining term.
Check your deal's overpayment limit first. Early repayment charges usually apply above 10% a year during a fixed rate.

## Related calculators

[Mortgage calculator Monthly repayments and total interest](https://computenow.co.uk/mortgage-calculator/)[Remortgage calculator Is switching deal worth it?](https://computenow.co.uk/remortgage-calculator/)[Savings calculator How your savings grow with interest](https://computenow.co.uk/savings-calculator/)

## Guides and help

### Our guides

[UK interest rates and inflation today Average mortgage, savings, loan and card rates](https://computenow.co.uk/guides/uk-interest-rates-and-inflation/)

### Official services and free advice

[Check a firm is authorised FCA register: lenders, brokers and advisers](https://register.fca.org.uk/)[Financial Ombudsman Service Free help with complaints about a lender](https://www.financial-ombudsman.org.uk/)

## Sources

Each source was last checked on 18 October 2026.

- [Bank of England: quoted household interest rates (September 2026)](https://www.bankofengland.co.uk/boeapps/database/FromShowColumns.asp?SearchText=IUMBV34&Travel=NIxAZx)
- [MoneyHelper: Mortgage calculator guidance](https://www.moneyhelper.org.uk/en/homes/buying-a-home/mortgage-calculator)
These results are an estimate, not financial advice. They use the 2026/27 rates in force on 24 October 2026 and the inputs shown, so your actual tax, pay or costs may differ. Before making a decision about your money, check the figures with HMRC or your provider, or speak to a regulated financial adviser. Free, impartial guidance is available from MoneyHelper.
This page explains the rules using the 2026/27 rates in force on 24 October 2026. It is general information, not financial advice. For decisions about your own money, speak to a regulated financial adviser, or get free, impartial guidance from MoneyHelper.