Loan Repayment Calculator (with Overpayments)
This loan repayment calculator shows how overpayments affect loan payoff time and total interest. Enter your remaining balance, interest rate, and current payment to see how extra monthly payments or lump sum overpayments change the payoff date and total interest.
Tip! - Target Payoff Date is optional but click calculate again to see the results
| Remaining Loan Balance (£) | |
|---|---|
| Interest Rate (%) | |
| Current Monthly Payment (£) | |
| Extra Monthly Overpayment (£) | |
| One-off Lump Sum (£) | |
| Target Payoff Date (Optional) |
How to Use the Loan Repayment Calculator (with Overpayments)
Step-by-Step Instructions
- Enter your current outstanding loan balance (£).
- Enter your annual interest rate (%).
- Enter your current monthly payment amount (£).
- Optionally, enter a monthly overpayment (£) and/or a one-off lump sum (£).
- Click "Calculate" to view your new payoff date, interest savings, and total overpayments.
- Optionaly - Select a target payoff month and year.
- Click "Calculate" to view your time saveed, interest savings, and new monthly payment amount.
Benefits of Making Loan Overpayments
Paying extra on your loan can:
- Reduce the total interest paid over the life of the loan, potentially saving you a substantial amount.
- Shorten your loan term, letting you become debt-free sooner.
- Increase equity or ownership of the underlying asset faster, if applicable.
- Provide more financial flexibility and stability once the loan is repaid.
- Allow you to plan and compare regular overpayments vs. lump sum payments.
Types of Overpayments
Lump Sum Overpayments
A one-off payment directly reduces the principal, lowering interest and shortening the loan term. Always check your lender’s terms for how lump sums are applied.
Regular Monthly Overpayments
Small extra payments each month gradually reduce the principal and interest, shortening your loan term over time. Consistent overpayments maximize savings.
Target Payoff Date
Instead of entering overpayments, you can select a target payoff month/year. The calculator will show the extra monthly payment needed to meet this goal, ignoring any overpayments or lump sums entered above.
Target Payoff Strategy
Some borrowers focus on clearing a loan by a specific date rather than making random overpayments. The target payoff mode calculates how much extra you would need to pay each month to eliminate the balance by your chosen date.
This approach can help when planning major financial goals such as paying off a mortgage before retirement or clearing a personal loan before starting another large expense.
Related Guides
- Loan Repayment Strategy Guide – strategies for paying off loans faster while minimising interest.
- Mortgage vs Investing Guide – when overpaying debt may outperform investing.
Frequently Asked Questions
How much interest can overpayments save?
Interest savings depend on the loan balance, interest rate, and size of the overpayments. The earlier extra payments are made, the more interest can be saved because the principal balance is reduced sooner.
Is it better to reduce the loan term or monthly payment?
Reducing the term usually saves more interest because the loan is repaid faster. Lowering monthly payments can provide more flexibility but typically results in more total interest paid over time.
Do lenders allow unlimited overpayments?
Some lenders allow unlimited overpayments, while others may limit them or charge early repayment fees. Always check the terms of your loan agreement before making large additional payments.
Does this calculator assume fixed interest?
Yes. The calculator assumes the interest rate remains constant for the entire repayment period.
Can I use this calculator for credit cards?
Not accurately. Credit cards typically use variable interest rates and minimum payments that change over time, which requires a different type of calculation.