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Effective January 2024

Federal and State Income Tax Withholding

2024 Rates

Tax Summary
Year 2024
Year 2023
Social Security/OASDI Rate
6.2 percent
6.2 percent
Social Security Maximum Wage Base
$168,600
$160,200
Maximum Social Security /OASDI Contribution
$10,543
$9,932.40
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
1.10 percent
0.09 percent
CA SDI Maximum Wage Base
$153,164
$153,164
403/457
$23,000
$22,500
403/457 over 50
$30,500
$30,000

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 2023 no later than February 15, 2024, to claim an exemption for 2024.