Employee pre-tax deferrals and after tax contributions must be paid to the plan at the earliest date that the amount can be segregated from the employer’s general assets. However, under no circumstances can the contributions be made after the 15th of the following month.
Close coordination between the employer, payroll processor and record-keeper is needed to assure that this requirement is met.
A late contribution gives rise to a prohibited transaction under ERISA, and is highly frowned upon. This will result in two penalties. The first is an operational fault for failing to follow the plan, and second, a fine for a prohibited transaction.
In addition to fines, the employer may be required to pay for lost market gains as a result of the delayed investing.