Effective January 2023

Federal and State Income Tax Withholding

2023 Rates

Tax Summary
Year 2023
Year 2022
Social Security/OASDI Rate
6.2 percent
6.2 percent
Social Security Maximum Wage Base
$160,200
$147,000
Maximum Social Security /OASDI Contribution
$9,932.40
$9,114.00
Medicare Rate
1.45 percent
1.45 percent
Medicare Maximum Wage Base
No limit
No limit
Maximum Medicare Contribution (1.45%)
No limit
No limit
CA SDI – PT Faculty Only
0.09 percent
1.10 percent
CA SDI Maximum Wage Base
$153,164
$145,600
403/457
$22,500
$20,500
403/457 over 50
$30,000
$27,000

Federal Withholding — Form W-4 (exempt status)

Individuals will need to complete a new Form W-4 “Employee’s Withholding Certificate” if they filed exempt in 2022 no later than February 15, 2023, to claim an exemption for 2023. 
Form W-4