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Mortgage overpayment calculator

Making regular or one-off overpayments reduces your mortgage balance quicker, helping you pay less interest and possibly pay off your mortgage sooner. Even small overpayments can make a difference.

  • I’m on a variable rate – you can overpay any amount on a variable rate.
  • I’m on a fixed rate – you can overpay up to 10% of your normal monthly repayment (or €65, whichever is greater). If you exceed this amount you must pay us compensation if we suffer a loss. You can learn how we calculate this compensation on our Information and legal notices page under the “Repaying your Mortgage early” section.




Request an overpayment

Please note: This calculator gives you indicative results only. It assumes all variables stay the same for the duration of the loan. However, rates can change which means the actual impact of a mortgage overpayment cannot be guaranteed.

For fixed rates, the maximum monthly overpayment is 10% of your existing monthly mortgage repayment, or €65, whichever is greater.

Any lump sum term reductions and interest savings noted are based on the lump sum payment being made and the repayment amount staying as it is now.

New lending rates not included in our calculators are our High Value Mortgage fixed interest rate. Terms and conditions apply. Cashback is not available with the High Value Mortgage fixed interest rate or our standard variable interest rate.

You can cancel your regular overpayments at any time. Overpayments made are not refundable. Subject to terms and conditions. Apply online to apply or remove an overpayment to your mortgage.


Being mindful about borrowing

Your financial wellbeing is our priority. Discover more about the relationship between borrowing and debt to make informed decisions about your mortgage and future.

Learn more about borrowing and debt


Need a helping hand?

Get support and assistance from our mortgage service specialists, 9am to 5pm, Monday
to Friday.

You can call us

Call 01 611 3333
Warning: If you do not keep up your repayments you may lose your home.
Warning: You may have to pay charges if you pay off a fixed-rate loan early.
Warning: If you do not meet the repayments on your loan, your account will go into arrears. This may affect your credit rating, which may limit your ability to access credit, a hire- purchase agreement, a consumer-hire agreement or a BNPL agreement in the future.
Warning: The cost of your monthly repayments may increase.

The lender is Bank of Ireland Mortgage Bank u.c., or Bank of Ireland. Lending criteria and terms and conditions apply. A typical mortgage to buy your home of €100,000 over 20 years with 240 monthly instalments costs €613.16 per month at 4.15% variable (Annual Percentage Rate of Charge (APRC) 4.3%). APRC includes €150 valuation fee and mortgage charge of €175 paid to Tailte Éireann. The total amount you pay is €147,482.50. We require property and life insurance. You mortgage your home to secure the loan. Maximum loan is generally 3.5 times gross annual income (4 times gross annual income for first-time buyers) and 90% of the property value. A 1% interest rate rise would increase monthly repayments by €53.89 per month. The cost of your monthly repayments may increase – if you do not keep up your repayments you may lose your home. Available to over 18s only. The mortgage will be subject to assessment of suitability and affordability. APRC calculations are based on the cost per month on a €100,000 mortgage over 20 years.

Bank of Ireland Mortgage Bank u.c. trading as Bank of Ireland Mortgages is regulated by the Central Bank of Ireland.


Information and legal notices

Legal and regulatory information for mortgages.

View information and legal notices