October 1, 2021
NEW 401k plan: Deadline to adopt a safe harbor 401(k) plan for 2021.
December 2, 2021
EXISTING 401k plan: Deadline to adopt the amendment necessary to convert a traditional 401(k) plan to a 3% nonelective safe harbor plan for 2021.
March 15, 2022
NEW 401k plan*: Deadline for S-Corps and partnerships (or LLCs taxed as either) to adopt a traditional 401(k) plan for 2021 (assuming NO tax return extension is filed).
April 15, 2022
NEW 401k plan*: Deadline for C-Corps and sole proprietorships (or LLCs taxed as either) to adopt a traditional 401(k) plan for 2021 (assuming NO tax return extension is filed).
September 15, 2022
NEW 401k plan*: Deadline for S-Corps and partnerships (or LLCs taxed as either) to adopt a traditional 401(k) plan for 2021 (assuming a tax return extension is filed).
October 15, 2022
NEW 401k plan*: Deadline for C-Corps and sole proprietorships (or LLCs taxed as either) to adopt a traditional 401(k) plan for 2021 (assuming a tax return extension is filed).
December 31, 2022
EXISTING 401k plan: Deadline to adopt the amendment necessary to convert a traditional 401(k) plan into a 4% nonelective safe harbor plan for 2021. *You may make a company contribution for the prior year; however, salary deferrals are not permitted to be made retroactively
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