48 CFR §29.402-1

1. (a)The contracting officer shall insert the clause at 52.229-6, Taxes—Foreign Fixed-Price Contracts, in solicitations and contracts expected to exceed the simplified acquisition threshold when a fixed-price contract is contemplated and the contract is to be performed wholly or partly in a foreign country, unless it is contemplated that the contract will be with a foreign government.
2. (b)The contracting officer shall insert the clause at 52.229-7, Taxes—Fixed-Price Contracts With Foreign Governments, in solicitations and contracts that exceed the simplified acquisition threshold when a fixed-price contract with a foreign government is contemplated.