Mortgage Overpayments UK 2026
Every extra pound you pay reduces your outstanding balance, which reduces future interest, which means more of your future payments clear capital. The compounding effect makes even modest overpayments surprisingly impactful.
How Much Could You Save?
On a £200,000 mortgage at 4.5% over 25 years (standard payment: approximately £1,111/month):
| Monthly Overpayment | Interest Saved | Years Saved |
|---|---|---|
| £100 | £14,200 | 2 years 8 months |
| £200 | £25,300 | 4 years 6 months |
| £500 | £48,700 | 8 years 3 months |
The 10% Annual Overpayment Rule
Most fixed rate mortgages allow overpayments of up to 10% of the outstanding balance per year without early repayment charges. Overpaying beyond 10% typically triggers a charge of 1 to 5% on the excess. Always check your mortgage terms.
Overpayment vs Investing
| Mortgage Rate | vs Stock Market Expected Return | Verdict |
|---|---|---|
| Above 5% | 7% long-term average | Close — consider both |
| 3–5% | 7% long-term average | Investing likely wins |
| Below 3% | 7% long-term average | Investing wins clearly |
Many people value the psychological security of reducing mortgage debt regardless of the pure maths. A combination of ISA investing and modest overpayment is sensible for most homeowners.
Always check your mortgage terms for early repayment charges before overpaying.