March
15 – IRS deadline to process corrective refunds without incurring 10% excise tax (non-EACA Plans)
April
15 – Deadline to process 402(g) refunds
June
30 – Deadline to process corrective refunds for EACA Plans
July
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
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, 2020 – nine months after that date, or two months after filing Form 5500
October
15 – Deadline to file Form 5500 with Form 5558 Application for Extension of Time to File
November
15 – Summary annual reports due to participants if the Form 5500 deadline was extended because of a corporate tax filing extension
December
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
31 – 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 2020 annual additions)
31 – IRS deadline to fund top heavy minimum contributions
