March 2023
15 – IRS deadline to process corrective refunds without incurring 10% excise tax (non-EACA Plans)
April 2023
17 – Deadline to process 402(g) refunds
June 2023
30 – Deadline to process corrective refunds for EACA Plans
July 2023
31 – Deadline to file Form 5500 without Form 5558 Application for Extension of Time to File
31– Deadline to file 5558 Application for Extension of Time to File (provides a 21/2 month extension to file Form 5500)
September 2023
15 – Form 5500 due to the Employee Benefits Security Administration (EBSA) from plans eligible for an automatic extension linked to a corporate tax extension
30 – Summary of annual reports due to participants from plans that end December 31, 2021 – nine months after that date, or two months after filing Form 5500
October 2023
16 – Deadline to file Form 5500 with Form 558 Application for Extension of Time to File
November 2023
15 – Summary annual reports due to participants if the Form 5500 deadline was extended because of a corporate tax filing extension
December 2023
1 – Last date to distribute Annual Safe Harbor Notice for the upcoming plan year
1 – Last date to distribute Annual Auto-Enrollment Notice for the upcoming plan year
1 – Last date to distribute Annual Qualified Default Investment Alternative Notice for the upcoming plan year
15 – Summary annual reports due to participants if the Form 5500 deadline was extended because of filing Form 5558
29 – Deadline for ADP/ACP test refunds of excess 401(k)/(m) contributions and allocable income or re-characterization of pre-tax contributions as after-tax (if not done by March 15 to avoid 10% excise tax), or corrective contributions (if not made by Oct. 15 to have them counted as 2021 annual additions)
31 – IRS deadline to fund top heavy minimum contributions for the 2022 plan year
