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Mortgage Overpayment Calculator

See how much interest you can save and how many years you can knock off your mortgage with additional payments.

edit_note Mortgage Details

£
£

If you leave this blank, we'll calculate the standard repayment.

add_circle Overpayments

£
£
Total Interest Saved
£0

Over the full term

Pay Off Date
-

Years Saved: 0

Total Interest Paid
£0

Original: £0

Balance Over Time Standard vs Overpayment

Repayment Schedule

First 12 Months
Month Interest Principal Extra Balance

Why Overpay Your Mortgage?

Every pound you pay over your required monthly instalment goes directly toward the principal balance. This has a"snowball" effect because it reduces the amount that interest is calculated on in every subsequent month.

The Benefits

  • verified Save Guaranteed Interest: The"return" on your overpayment is effectively the mortgage interest rate. At 4-6%, this is often better than savings account returns after tax.
  • verified Earlier Freedom: Knocking 5 or 10 years off your mortgage can lead to an earlier retirement or more disposable income later in life.
  • verified Increase Equity: Paying down your mortgage faster increases your Loan-to-Value (LTV) ratio, which may unlock better interest rates when you remortgage.

Frequently Asked Questions

How much am I allowed to overpay UK?

Most UK mortgage lenders (like Nationwide, HSBC, or Barclays) allow you to overpay up to 10% of your outstanding balance each year without penalty. Check your mortgage offer for"Early Repayment Charges" (ERCs).

Lump sum vs. monthly overpayment?

A lump sum saves more interest initially because it reduces the balance immediately. However, consistent monthly overpayments are often easier to manage for household budgeting.

Should I pay off debt or the mortgage?

Generally, you should pay off higher-interest debt (like credit cards or car finance) before overpaying a mortgage, as mortgage rates are typically lower.