Chapter 1, Part 18 of the Taxes Consolidation Act, 1997, provides for a withholding tax to be deducted from payments made by certain bodies for professional services. Professional services withholding tax , PSWT, is deducted by accountable persons from relevant payments made by them to specified persons in respect of professional services. The following are accountable persons: Government Departments and offices, local authorities, including health boards, vocational education committees and the GMS and commercial and non-commercial semi-State bodies.