Mortgage cost of credit explained in Ireland
Cost of credit is a useful way to understand how much a mortgage costs above the amount originally borrowed, particularly when comparing terms and overpayments.
Page checked: 21 October 2026
What is cost of credit?
For a standard capital-and-interest mortgage, the total amount paid over the life of the loan includes the original principal plus interest. The interest component is a major part of the cost of credit, although fees and other costs may sit outside the simple calculation.
Why term matters
A longer term usually reduces the monthly payment but leaves the balance outstanding for longer, which generally increases total interest. Overpayments can potentially reduce the term and interest, subject to lender rules.
Use the calculator to compare the monthly payment, total interest and effect of overpayments.
Sources & assumptions
Central Bank mortgage-measure limits and Revenue stamp-duty rules can change. Check the official sources before relying on an estimate.
Central Bank mortgage measures · Central Bank retail interest rates