Exact Online Fiscaal – Incorrect calculation of labour tax credit and general tax credit in a 2025 income tax C form (NL)

Update timeline

1. 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.

2. 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.

3. identified May 20, 2026, 08:14 AM UTC

   We are continuing to investigate this issue.

4. identified May 28, 2026, 01:11 PM UTC

   We are continuing to work on a fix.

5. 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.