Mortgage Overpayment Savings Calculator (UK)

Mortgage Overpayment Guide (UK)

How Overpaying Saves Money

Every pound you overpay reduces the balance on which interest is charged — for the entire remaining term. The effect compounds. Overpaying £200/month on a £180,000 mortgage at 5% over 22 years could save tens of thousands in interest and cut years off the term. Why it's so powerful: mortgage interest is charged on the outstanding balance. Reducing the balance early means less interest accrues every subsequent month. Early overpayments save the most (more years of compounding). The 'effective ret

Overpayment Limits and Penalties

Most UK mortgages allow penalty-free overpayments up to 10% of the outstanding balance per year. Check your specific terms. During a fixed or discounted deal: typically 10%/year penalty-free. Overpaying beyond this incurs Early Repayment Charges (ERCs). On standard variable rate (SVR): usually unlimited overpayments allowed. ERCs (Early Repayment Charges): typically 1-5% of the amount overpaid above the limit. Tapering down over the fixed period (e.g. 5% year 1, 4% year 2...). Can be substantial

Overpay vs Save vs Invest

The key financial decision: where does spare money work hardest? Overpay the mortgage if: your mortgage rate exceeds your after-tax savings rate. You value guaranteed, risk-free debt reduction. You want to be mortgage-free sooner (psychological benefit). You've used your ISA allowance and have no better tax-free home. Keep in savings if: savings rate (after tax) exceeds mortgage rate. You need an accessible emergency fund (always keep 3-6 months expenses liquid). You might need the money soon. Y

Practical Considerations

Before overpaying, make sure: you have an emergency fund (3-6 months expenses) — don't lock all spare cash into the house. No higher-interest debt exists (credit cards at 20%+ should be cleared first). You're capturing employer pension match (free money beats overpaying). You understand your overpayment allowance and ERCs. How to overpay: most lenders allow online overpayments, standing orders, or lump sums. Specify whether to reduce the term or the monthly payment. 'Reduce term' usually saves m