In plain English
FAR 52.237-8, Restriction on Severance Payments to Foreign Nationals, is a solicitation provision prescribed at FAR 37.113-2(a), most recently dated Aug 2003. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 37.113-2(a), use the following provision:
Prescribing reference: FAR 37.113-2(a).
The official text, verbatim
As prescribed in 37.113-2(a), use the following provision:
Restriction on Severance Payments to Foreign Nationals (Aug 2003)
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(a) The Federal Acquisition Regulation (FAR), at 31.205-6(g)(6), limits the cost allowability of severance payments to foreign nationals employed under a service contract performed outside the United States unless the agency grants a waiver pursuant to FAR 37.113-1 before contract award.
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(b) In making the determination concerning the granting of a waiver, the agency will determine that-
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(1) The application of the severance pay limitations to the contract would adversely affect the continuation of a program, project, or activity that provides significant support services for-
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(i) Members of the armed forces stationed or deployed outside the United States; or
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(ii) Employees of an executive agency posted outside the United States;
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(2) The Contractor has taken (or has established plans to take) appropriate actions within its control to minimize the amount and number of incidents of the payment of severance pay to employees under the contract who are foreign nationals; and
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(3) The payment of severance pay is necessary in order to comply with a law that is generally applicable to a significant number of businesses in the country in which the foreign national receiving the payment performed services under the contract, or is necessary to comply with a collective bargaining agreement.
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(End of provision)