Mortgage Overpay vs Invest

If your mortgage rate is above 4%, overpaying gives a guaranteed risk-free return of 4%+. If below 3%, investing in a diversified portfolio may beat overpaying even after 33% CGT. Irish mortgage rates in 2026 average 3.5-5% for fixed rates.

Investment gains are taxed at 33% CGT in Ireland (with a €1,270 annual exemption). This calculator shows gross investment values — actual returns after CGT are lower. The mortgage overpayment return is tax-free.

Overpaying reduces your Loan-to-Value (LTV) ratio, which may qualify you for a better rate when you remortgage. This benefit is not captured in this calculator but can be significant at LTV thresholds like 80% and 60%.

Most Irish fixed-rate mortgages limit overpayments to 10% of the outstanding balance per year without penalty. Exceeding this may incur breakage fees. Check your lender's terms before overpaying.

No. Investing involves market risk. Overpaying gives a guaranteed return equal to your mortgage rate. With Irish mortgage rates at 3.5-5% and expected investment returns of 5-8%, the decision is finely balanced in 2026.

Many Irish homeowners do both — overpay part of their surplus and invest the rest. This diversifies your financial strategy. A common approach: overpay to the 10% limit, then invest the rest in a low-cost ETF inside a pension for tax relief.

With Irish mortgage rates at 3.5-5% and CGT at 33%, the calculation depends heavily on your rate. Use this calculator with your actual numbers to see which path wins for you. Remember: overpaying is guaranteed; investing is not.

Inflation erodes the real value of your mortgage debt. With Irish inflation historically averaging 2-3%, your mortgage effectively "shrinks" in real terms over time. This makes investing slightly more attractive since your debt naturally decreases in purchasing power.

Pension contributions in Ireland receive tax relief at your marginal rate (20% or 40%). This can make pension investing significantly more attractive than both overpaying and regular investing. Compare with our Pension Efficiency calculator.

If you plan to carry your mortgage into retirement, overpaying becomes more important. Retirement income is typically lower, and lenders may not offer long terms to older borrowers. Aim to clear your mortgage before retirement if possible.

With a variable rate, your mortgage payments can change. If variable rates rise above 5%, overpaying becomes very attractive. If they fall below 3%, investing wins. Consider fixing your rate if you want certainty in your comparison.

The crossover year is when your investment portfolio value exceeds your remaining mortgage balance (with overpayment). After this year, investing has financially outperformed overpaying. A shorter crossover year means investing is more attractive.