Finance & Irish taxes · Calculator companion · By K Imports
Dated investment XIRR: practical guide
This guide explains how to use the Count.ie dated investment xirr. Measure annualised return from actual dated cash movements. Follow the inputs, method and worked example below, then compare your own scenario.
Guide written .
Open the Dated investment XIRR 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
Combine same-date flows and discount by elapsed actual days divided by 365.
Worked example
Illustrative inputs and their result.
Example inputs
- Dated cash flows: YYYY-MM-DD, amount
- 2025-01-01, -10000 2025-06-01, 1000 2026-01-01, 10500
- Annual discount rate (%)
- 5
Calculated example result
- Annualised Xirr Percent
- 15.9039%
- Dated Net Present Value
- €980.02
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
Rows: YYYY-MM-DD, signed flow. Single sign change required for a reported root; different conventions can change results.
If your case falls outside this scope, use a more suitable calculator or contact us about an unclear method.