Ireland DIRT Calculator: Deposit Interest Retention Tax
Work out the Irish DIRT (Deposit Interest Retention Tax) on your savings interest — the tax banks deduct at source from deposit interest — and see how much interest you keep after it.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | DIRT deducted | Gross interest plus DIRT figure |
|---|---|---|
| 33% of €1,000 (€330) | $330.00 | $1,330.00 |
| 33% of €500 | $165.00 | $665.00 |
| 33% of €2,500 | $825.00 | $3,325.00 |
| 41% of €1,000 (older rate) | $410.00 | $1,410.00 |
How This Calculator Works
Enter the gross interest your deposit earns and the DIRT rate (recently 33%). The calculator shows the DIRT deducted; subtract it from the gross interest to get what you actually receive. DIRT is withheld automatically by the bank or financial institution before paying you, so the interest credited to your account is already net of the tax.
The Formula
Percentage Add-On
Rate is the tax or tip percentage applied to the amount
Worked Example
At 33% on €1,000 of gross deposit interest, DIRT of €330 is deducted — leaving €670 net. DIRT (Deposit Interest Retention Tax) is a final tax the Irish bank or credit union withholds at source on interest paid to most resident savers. Because it's deducted automatically and is generally a final liability, most savers don't need to declare the interest separately. Certain people — such as those aged 65+ under an income limit, or the permanently incapacitated — may be exempt and can have interest paid gross.
Key Insight
DIRT is the standard way savings interest is taxed in Ireland, and a few points clarify how it works. It's a withholding tax: the bank, building society, credit union, or other deposit-taker deducts DIRT from your interest before crediting it, so the figure you see in your account is already net — there's normally nothing further to pay or file, since for most savers DIRT is a final tax. The rate has moved over the years (it was as high as 41% in the mid-2010s and has since come down to 33%), so use the rate for the year the interest was paid. Key exemptions this calculator doesn't model: individuals aged 65 or over may receive interest free of DIRT if their total income is below the relevant exemption limit, and permanently incapacitated individuals can also qualify — both typically by completing the appropriate declaration (e.g. form DE1) with their bank so interest is paid gross. First-time buyers have historically had a separate DIRT refund scheme on savings used toward a home, and companies are taxed differently (deposit interest is dealt with under corporation tax, not DIRT). One nuance: in some cases PRSI can also apply to deposit interest for certain individuals, which this calculator ignores. Note too that DIRT applies to Irish deposit interest; interest from foreign accounts is generally taxable but outside the DIRT-at-source system and must be declared. This calculator shows the DIRT deducted and lets you read off the net interest (gross minus DIRT); confirm the current rate, and if you're over 65 within the income limit or otherwise exempt, make the declaration so your interest is paid without DIRT rather than reclaiming it later.
Frequently Asked Questions
How is DIRT calculated?
Multiply your gross deposit interest by the DIRT rate. At 33% on €1,000 of interest, DIRT is €330, leaving €670 net. The bank deducts it at source before paying you, so the interest credited to your account is already after DIRT.
What is DIRT?
Deposit Interest Retention Tax — a tax the Irish bank, credit union, or other deposit-taker withholds at source on interest paid to resident savers. It's deducted automatically before the interest reaches you and is generally a final tax, so most savers don't need to declare the interest separately.
What is the DIRT rate?
Recently 33%. The rate has changed over the years — it peaked at 41% in the mid-2010s before falling — so use the rate for the year your interest was paid. It applies to most deposit interest paid to Irish residents and is withheld by the financial institution.
Can I be exempt from DIRT?
Yes — individuals aged 65 or over with total income below the relevant exemption limit, and permanently incapacitated individuals, can have interest paid gross by completing the appropriate declaration (such as form DE1) with their bank. There have also been DIRT refund schemes for first-time buyers saving toward a home.
Do I need to declare interest after DIRT?
Usually not for Irish deposits — DIRT is generally a final tax deducted at source, so there's nothing more to pay. However, interest from foreign accounts is outside the DIRT system and must be declared, and in some cases PRSI can apply to deposit interest for certain individuals.
Related Calculators
Methodology & Review
DIRT is the tax rate applied to gross deposit interest; the total here is the gross interest plus the tax figure, so the tax (chargeAmount) and the net interest are easy to read off. It models the flat DIRT rate on interest and does not handle exemptions (over-65s, certain low-income savers) or any PRSI that may apply to deposit interest in some cases.
Written by Ugo Candido · Last updated May 22, 2026.