How do I set up withholding tax options?

You can set up withholding tax in Payables or Tax setup. Here's how you do it:

Application	Page Name	Task
Payables	Manage Tax Reporting and Withholding Tax Options	Select the withholding tax options for the business unit.
Tax	Manage Configuration Owner Tax Options	Select the withholding tax options for the legal entity or business unit. Select Determine applicable Withholding regimes as the regime determination set.