If you are subject to multiple withholding orders, the employer will apply these in the following order.
Tax levies. Federal tax levies should be satisfied before all other orders for deductions of pay, unless a child support orders was received by the employer prior to the tax levy.
Child support orders. Child support orders should be satisfied before garnishments and student loan collections, but generally do not take precedence over tax levies, unless the child support order was received by the employer prior to the tax levy, or if the IRS instructs the employer to satisfy all child support orders first, regardless of when the employer received the order.
Garnishments. Garnishments should be satisfied only after tax levies and child support orders have been satisfied.
Student loans and other federal government agency garnishments. No official guidance exists on what priority to give student loans and other federal government agency garnishments. However, it is likely that tax levies and child support orders will take priority. Employers processing student loan and other federal agency garnishments should contact the issuing agency if questions regarding priority arise.
Note: State laws will govern the treatment of state tax levies and multiple child support orders.