As NJ Mike points out in last post, the IRS service center is supposed to pick up the aggregate excess deferral across all unrelated employers from the multiple W-2's and the individual is taxed on the excess in the year of deferral and in the year of distribution (because you don't get basis for what was taxed in the year of deferral). The only way out for the individual is to obtain a distribution of the excess by April 15 of year following year of deferrals. The plan document is not required to provide for distribution of excess deferrals, but most do, if requested, and of course the individual needs to understand the rules, identify each of the plans that he/she deferred into and which will distribute excess amounts, allocate excess to one or more plan(s), and request distribution sufficiently in advance of 4/15 that the distribution will be made by then. Of course, in determining which plan(s) to allocate the excess to the individual will most likely want to choose the plan with the lower(est) match.