Haven't researched this one recently. But I seem to recall some gossip to the effect that the IRS has at least informally suggested that one cannot defer vacation or sick leave pay after such leave is "earned." Thus, suppose you had a carryover of vacation from year to year, with a cash-out upon termination of employment. Under this theory, a salary reduction agreement entered into in January of the year of termination of employment might be able to cover only vacation pay earned in the year of termination, not that carried over from prior years and paid out upon termination.
Anyone been following this enough to know whether this position has been codified or rejected at this point? Personally, I try to avoid citing gossip as authority when I can avoid it.

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