How Do Payroll Taxes Differ From Income Tax?
Payroll taxes fund specific programs — Social Security and Medicare — and are calculated as a flat percentage of wages, not a progressive rate. Income tax is calculated on a graduated scale and funds general government operations. Both are withheld from paychecks, but payroll taxes appear on your pay stub as 'FICA' (Federal Insurance Contributions Act) charges separate from federal income tax withholding.
What Is the Social Security Wage Base?
The Social Security portion of payroll tax applies only to wages up to an annual ceiling — $168,600 in 2024 — adjusted each year for average wage growth. Once earnings exceed this amount, no additional Social Security tax is withheld for the year. The Medicare portion has no wage base cap and applies to all earned income, with an additional 0.9% on wages above $200,000.
Do Payroll Taxes Fund Future Benefits?
Yes. Your Social Security contributions — tied to your Social Security Number — create an earnings record that determines your eventual benefit. More years of higher earnings generally produce a larger benefit at retirement. Medicare contributions similarly fund your eligibility for Medicare at age 65. You need at least 40 quarters (10 years) of covered employment to qualify for Social Security retirement benefits.
Frequently asked questions
Can employees see payroll taxes on their pay stub?
Yes. Your pay stub shows federal income tax withholding separately from Social Security tax and Medicare tax withheld. The employer's matching contribution does not appear on your stub — it is an additional cost paid by the employer directly to the IRS.
Are payroll taxes deductible?
The employee's share is not deductible on personal returns. Employers deduct their matching share as a business expense. Self-employed individuals deduct half of their self-employment tax (which combines both shares) as an above-the-line deduction on Form 1040.