When an IRC Section 401(k) plan fails the actual deferral percentage (ADP) test or actual contribution percentage (ACP) test, the plan administrator should issue a notice of correction letter to all affected highly compensated employees and, when applicable, a notice that a corrective distribution is being made.
Letter explaining corrective distribution
Description: If the plan corrects the tests via distributions, the plan sponsor will send the participant a letter that describes the refund process and any taxability issues. The participant will also receive a check for the amount of the distribution and a Form 1099-R, Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc.
Amount of the distribution: The Form 1099-R amount will include the returned contributions and any income earned on that amount.
Timing: Returned excess contributions or excess aggregate contributions, along with earnings, are reported on Form 1099-R as taxable to the recipient in the year of distribution.
Who is responsible for sending it: The administrator of the plan.