Follow the deadline for your tax return:
- 30 April for salary recipients (PSA)
- 31 May for businesses (PSAN).
NB It is a good idea to submit any changes a few days before the deadline, so that you can receive a re-calculated report (RF-1088-R) before PSA/N must be submitted. The tax calculation is so complicated that it must be performed in AR (cannot be done in Altinn).