31 C.F.R. § 594.512
Payment of taxes and incidental fees to the Palestinian Authority
Effective April 12, 2006, U.S. persons are authorized to pay taxes or fees to, and purchase or receive permits or public utility services from, the Palestinian Authority where such transactions are necessary and ordinarily incident to such persons' day-to-day operations. Nothing in this license authorizes a debit to an account of the Palestinian Authority on the books of a U.S. financial institution or to any account blocked pursuant to this part.