Several things:
First, there are four limits, each very different than the others. Here they are as stated in FAR 52.219-14:
(1) Services (except construction). At least 50 percent of the cost of contract performance incurred for personnel shall be expended for employees of the concern.
(2) Supplies (other than procurement from a nonmanufacturer of such supplies). The concern shall perform work for at least 50 percent of the cost of manufacturing the supplies, not including the cost of materials.
(3) General construction. The concern will perform at least 15 percent of the cost of the contract, not including the cost of materials, with its own employees.
(4) Construction by special trade contractors. The concern will perform at least 25 percent of the cost of the contract, not including the cost of materials, with its own employees.
Second, note that for services and supplies the limit on subcontracting is 50 percent, not 51 percent.
Third, the limitation percentages are applied to three different bases: (a) “cost of contract performance incurred for personnel,” (b) “cost of manufacturing the supplies, not including the cost of materials,” ( c) “cost of the contract, not including the cost of materials.” Each of those terms is defined in 13 CFR 125.6(e), along with “cost of materials” and “subcontracting.” I won’t quote them. Go see for yourselves.
Fourth, the mathematical procedure for determining the proper measure of each base will be different. The most problematic one appears to be the one for services – the “cost of contract performance incurred for personnel.” There are about 250 decisions (Court of Federal Claims, boards of contract appeals, GAO, and SBA Office of Hearings and Appeals) that address compliance with FAR 52.219-14, and there are a number of articles and professional texts that address it. Nowhere have I found a clear statement of how to calculate the “cost of contract performance incurred for personnel.” I am still reading cases. The other bases appear to be less problematical.
In any case, it is clear from 13 CFR 125.6 that (a) overhead applicable to labor and (b) G&A are to be applied to direct labor costs when calculating the cost of performance incurred for personnel, so the “professor” was clearly wrong.
contractor100 thinks s/he knows what the questioner at AAP really wanted to know. Here is the question as posted:
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Can the prime include the G&A on subcontracts in the calculations to achieve the goals of 51% per the above referenced FAR?
contractor100 thinks that really means:
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Can the prime include the prime's markup on the sub's labor (G&A, materials handling fee) as "cost of contract performance?
Well, maybe it does, but I don’t see it. I don’t know what “the G&A on subcontracts” means. I guess you can say that someone else’s question says whatever you think it should, but the better procedure would be to ask for clarification before venturing an answer. Hit the “professor” another lick.
Let me know if any of you figure out whatever it is you’re trying to figure out.