Policy Steward: 
Assistant Director of Payroll
Format Updated: 
University Policy & Standards Converted: 
Revision Date: 
Wednesday, May 5, 2021
Next Review Date: 
Wednesday, May 5, 2021

* This information replaces PAY 802 Mandatory Deductions


Mandatory Deductions

Effective: 01/01/2001
Revised: 12/30/2014

Mandatory deductions are those required by State and Federal laws.  Without these specific deductions in place, an employee cannot be paid in Banner.   These deductions include:

  • State and Federal income tax
  • Social Selacurity and Medicare tax
  • Workers' Compensation Insurance and State Accident Insurance Fund
  • Transit Tax
  • Unemployment tax

802-01 State and Federal Income Tax Withholding

Deductions are determined by the filing status provided by the employee on his/her W-4. If no W-4 is filed, per IRS policy, an employee's withholding is defaulted to a status of  Single with Zero exemptions. Tax withholding is determined by graduated tax tables provided by State and Federal governments.

Current annual assessment rates for the following can be found on the Banner Fringe Budgeting Rule Form NTRFRNG under the TSS, TME, TSF, TWC and TT1 Benefit codes. These deductions are system calculated and all are OPE related deductions.  See 1000 Other Payroll Expenses (OPE)

802-02 Social Security and Medicare Tax

Deductions for Social Security and Medicare tax are based on certain percentage rates set by the Federal government. Annual maximum withholding is set by the Social Security Administration for Social Security subject wages.  Medicare Tax has no income limit. Once the maximum amount has been withheld, no further Social Security deduction is taken until the next tax year beginning in January.  The percentages for Social Security and Medicare taxes may vary from year to year. Both the rates and the maximum amounts are on the online Fact Sheet available at the Social Security Website.

Students enrolled at least halftime (6 hours for undergraduates and 5 hours for graduates) in Oregon State University (including dual enrollment) are exempt from Social Security and Medicare tax on OSU wages while enrolled at the university; however, during any term the student employee is not enrolled at least halftime, typically summer break, these taxes will be deducted from their paycheck.  Non-system students (students enrolled at another school) are fully subject to Social Security and Medicare Taxes.

802-03 SAIF & Workers' Compensation

SAIF (State Accident Insurance Fund) is an insurance premium charged to employers to cover injured worker claims. It provides insurance to covered employers against liability for employee injury or illness arising out of or in the course of employment.

Workers Compensation assessment is based on the number of hours worked.  Employees and employers alike are required to pay an assessment by payroll deduction for each full or partial hour of work. Overtime hours are included in the number of hours reported.  This provides the funding of programs that assist injured workers.

802-04 State and Mass Transit Tax

State Transit Tax is charged to all employees as a flat 0.1 percentage of pay. Additionally, mass transit district taxes are charged to employers on any employee physically working in either the Tri-Met (Portland Metro Area) or LTD (Lane County) Mass transit districts. Setup is required for both State Transit Tax and Mass Transit Tax on all employees, departments are charged only for those whose work locations are within the boundaries of the two Mass transit districts.

802-05 Unemployment Tax

Unemployment tax is a mandatory tax requirement for all but student positions.  Students are eligible for student positions based upon their student status and as such, unemployment taxes are not paid on their behalf.