did a little more research, at least at the 2009 ASPPA Q and A 48-53 (a whole bunch of questions on this one!) the IRS voiced an opinion such comp is eligible
48. An employee terminates in December 2009. A final payment of salary due for services is made in January 2010. The plan does not use the “first few weeks” rule in the IRC §415 regulations to treat the January payment as made in 2009. The plan year is the calendar year. The plan includes a section 401(k) arrangement that defines compensation eligible for deferral to be section 415 compensation. Is the individual included in the 2010 ADP test, even though he terminated employment in the 2009 plan year?
Yes. Since he could defer out of the compensation paid in January 2010, he is an eligible employee under the 401(k) arrangement for the 2010 plan year. The 401(k) regulations do not treat active and former employees differently
50. Suppose instead that the plan is a safe harbor plan that provides the safe harbor nonelective contribution. Is this individual entitled to that contribution?
Yes. Since, as discussed in Q-1, the individual is treated as an eligible employee for 2010, he is entitled to a safe harbor contribution. However, if this individual is an HCE, and the plan does not provide the safe harbor contribution to HCEs, then no safe harbor contribution is made on his behalf. The same answer would apply to a safeharbor match if the individual made elective deferrals out of the 2010 compensation.
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Robert Kaplan gave an ASPPA presentation the following year and included this stuff in his talk
http://www.asppa-net.org/Portals/2/Defining Compensation in Qualified Plans.pdf