Officient incident
Exact Online Fiscaal – Incorrect calculation of labour tax credit and general tax credit in a 2025 income tax C form (NL)
Officient experienced a minor incident on April 21, 2026 affecting Exact Online Fiscaal, lasting 44d 5h. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Apr 21, 2026, 08:01 AM UTC
You may experience that the labour tax credit (arbeidskorting) and the general tax credit (algemene heffingskorting) are calculated incorrectly in a 2025 income tax return C form. Behind the calculators for tax credits on the send page, a different amount appears than expected for "vermindering vanwege beperkt/geen premie plicht". We are investigating this issue, and we will update this page as soon as more information becomes available. Our apologies for the inconvenience.
- identified May 06, 2026, 07:35 AM UTC
We have identified the issue. Our investigation has shown that the calculation of the tax credit is incorrect in several situations. This applies to the general tax credit (algemene heffingskorting) and the labour tax credit (arbeidskorting). We are continuing to work on implementing a fix.
- identified May 20, 2026, 08:14 AM UTC
We are continuing to investigate this issue.
- identified May 28, 2026, 01:11 PM UTC
We are continuing to work on a fix.
- resolved Jun 04, 2026, 01:29 PM UTC
This issue has been resolved as we have made several changes to the calculation of the general tax credit (algemene heffingskorting) and labour tax credit (arbeidskorting). These calculations are adjusted based on the following judgements from the Supreme Court (Hoge Raad): -ECLI:NL:HR:2024:470 -ECLI:NL:HR:2024:1660 -ECLI:NL:HR:2026:318 (ECLI:NL:GHSHE:2024:2649) Our apologies for the inconvenience.