3 pages. Excerpt: The Treasury Department issued revised final regulations under § 415, which new rules are effective for plan years beginning on and after January 1, 2008. (For non-calendar plan years, the regulations are effective for years beginning on or after July 1, 2007.) .... For 401(k), 457(b) and 403(b) plans that allow employees to direct some of their pay into plans, the new rule means that amounts paid after employment terminates may not be deferred and contributed, even if it is W-2 pay, unless an exception applies (see below).