Project savings growth in euro with regular contributions.
Future value
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Total contributions
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Total interest
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Interest after DIRT
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Your breakdown
Updates live as you type
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Amount (EUR)
Worked example
Start with 10,000 euro and add 200 euro a month for 20 years at a 4% annual return, compounding monthly. You pay in 10,000 plus 48,000 over the period, so 58,000 euro of your own capital. Compounding lifts the balance to about 95,825 euro, which means roughly 37,825 euro is pure growth. If this were a deposit account, that interest would face Deposit Interest Retention Tax at 33%, leaving about 25,343 euro of net growth. Returns from shares or funds are taxed under different rules, through Capital Gains Tax or exit tax, so the after tax figure depends on where the money sits.
How it is calculated
Compound growth applies the return to the whole balance each period, so the interest earned itself earns interest in later periods. The calculator steps through the horizon period by period, adding each contribution at the start of its period and then crediting growth on the running balance. The periodic rate is the annual return scaled to the chosen compounding frequency, so monthly compounding divides the rate by 12 and applies it twelve times a year. Total contributions are your starting amount plus everything you pay in, and growth is the future value minus those contributions. For Irish deposit accounts, the interest portion is reduced by 33% DIRT, which this page shows alongside the gross figure. These projections assume a steady return, whereas real markets vary year to year.
Frequently asked questions
Is interest on Irish savings taxed?
Yes. Interest on most Irish deposit accounts has Deposit Interest Retention Tax (DIRT) deducted at 33%, so the growth shown here is before DIRT on a deposit account. Returns from shares or funds are taxed differently, through Capital Gains Tax or exit tax. This calculator projects gross growth, so reduce deposit interest by the DIRT rate to see the net figure.
What is the current DIRT rate in Ireland?
The DIRT rate is 33% for 2025 and 2026. Revenue deducts it automatically at source from deposit interest paid by Irish banks and building societies before the money reaches your account, so you do not need to file a return for DIRT already withheld. Non-resident investors may claim a DIRT exemption or reduced rate under a double taxation agreement.
How does compound interest differ from simple interest?
Simple interest applies only to the original principal each period. Compound interest also applies to accumulated interest, so each period the base grows. Monthly compounding means the annual rate is divided by 12 and applied twelve times a year, generating slightly more growth than annual compounding at the same headline rate. The difference compounds over long horizons, which is why time in the market matters more than timing the market.
Are investment fund returns taxed differently from deposit interest in Ireland?
Yes. Returns from Irish-domiciled investment funds and ETFs are subject to exit tax at 41%, not DIRT. The exit tax applies to gains and income on disposal or every 8 years under the deemed disposal rule, whichever comes first. Direct shareholdings are taxed through Capital Gains Tax at 33% on disposal, with an annual CGT exemption of 1,270 euro. Revenue publishes guidance on these rules at revenue.ie.