Finance & Irish taxes · Calculator companion · By K Imports
Deposit interest & DIRT: practical guide
This guide explains how to use the Count.ie deposit interest & dirt. See savings interest after Deposit Interest Retention Tax. Follow the inputs, method and worked example below, then compare your own scenario.
Guide written .
Open the Deposit interest & DIRT calculatorWhat to prepare
- Find the relevant statement, payslip or transaction record rather than estimating from a bank balance.
- Identify the tax year, transaction date and whether each amount is gross, net, annual or monthly.
- Separate known facts from assumed rates and check eligibility against the linked official sources.
Understand the inputs
The calculation method
Net interest = gross interest × (1 − DIRT rate).
Worked example
Illustrative inputs and their result.
Example inputs
- Gross deposit interest (€)
- 1000
- Confirmed exemption applies
- No
Calculated example result
- Net Interest
- €670.00
- Deposit Interest Retention Tax
- €330.00
How to interpret the result
Distinguish a tax saving, a tax bill, cash received and money remaining: they are not interchangeable. An estimate does not establish eligibility, filing compliance or when a refund will be paid.
Compare the same income or transaction under one changed assumption at a time. Keep a record of the year, date and assumptions so a change in the result can be explained.
Common mistakes to avoid
- Do not mix tax years or apply a newly announced measure to an earlier transaction.
- Avoid counting an allowance, credit, contribution or loss twice.
- Check exclusions and personal circumstances before relying on the headline result.
Assumptions and sources
DIRT means Deposit Interest Retention Tax. The published standard rate is 33%. Foreign interest, PRSI liability and exemption conditions need separate checks.
Rules checked . Baseline rules year: 2026. Reviewed scope: Revenue standard DIRT rate 33%; exemption, foreign-interest filing and possible PRSI treatment require confirmation.. This does not verify every selectable year, date or Budget announcement profile.
Sources and further information
If your case falls outside this scope, use a more suitable calculator or contact us about an unclear method.