We have had the same question come up and have determined that the payment for unused vacation time is not a bonus--it is regular deferral and match-eligible compensation.
A related question (that just came up today, so this thread was conveniently relevant) is whether or not the employer can do something more plan-specific with the unused vacation/sick time payout. Ultimately, the plan sponsor would like to contribute the unused vacation/sick time payout to the plan for the affected participants, rather than paying them in cash. We do not believe that that is directly possible--it cannot be a profit sharing contribution (even if the plan were cross-tested) since the participants essentially have discretion over whether or not such an amount would be contributed (i.e., by not taking all their vacation time), and it wouldn't be a deferral since the participants wouldn't be given the option to receive the payment in cash. Any suggestions on a plan design that would accomplish the employer's goal of getting this money into the plan, rather than paying it directly to the employees?
One idea that came up was to give the employees the option of a payout of 50% of their unused vacation/sick time or a contribution of 75% of that amount to the plan as an incentive to get them to put the money in the plan (the percentages here are just for example--other options could work). Two potential problems immediately come to mind: 1) since this money would be deferrals, this solution doesn't help anyone who is already deferring the max, and 2) isn't this just a fancy way of saying that their choice is a 50% payout but, if they put it in the plan, then they get a 50% match on it, in which case it just adds ACP issues?
Any thoughts on plan design would be greatly appreciated. Thanks!