Do Part-Time Employees Pay Federal Tax and FICA?

Yes. Part-time employees pay federal tax and FICA on the same rules as everyone else, but the two work very differently at low earnings. Federal income tax only hits income above the standard deduction, which for 2026 is $16,100 for a single filer, so many part-time workers owe little or nothing. FICA has no such cushion: 7.65% comes out of every paycheck starting with the first dollar.¹

Federal Income Tax on Part-Time Earnings

Federal income tax applies to your taxable income, which is total earnings minus the standard deduction (or itemized deductions, if larger). For 2026 the standard deduction is:

Single: $16,100
Married filing jointly: $32,200
Head of household: $24,150

If your gross income for the year stays under your standard deduction, your taxable income is zero and you owe no federal income tax.¹ A single filer earning $15,000 owes nothing in federal income tax because the whole amount sits below the $16,100 threshold.

Earning more than the deduction doesn’t tax the whole paycheck. Only the amount above the deduction becomes taxable, and that amount flows through the brackets. For a single filer in 2026, the first $12,400 of taxable income is taxed at 10% and the next slice up to $50,400 at 12%.¹ A single filer earning $25,000 has $8,900 of taxable income and owes $890 for the year. The IRS doesn’t distinguish between part-time and full-time; a full-time worker earning the same $25,000 owes the same $890.

FICA Comes Out of Every Paycheck

Payroll taxes under the Federal Insurance Contributions Act apply to every dollar of W-2 wages, starting with your first paycheck.² Your employer withholds 7.65% from gross pay and sends it to the IRS. That breaks into:

Social Security: 6.2% on wages up to $184,500 in 2026
Medicare: 1.45% on all wages, no cap

Your employer pays a matching 7.65% on top, for a combined FICA rate of 15.3%.³ The Social Security wage base won’t matter to most part-timers, but the principle does: earn $3,000 for the year and you’ll pay $229.50 in FICA even though you owe zero income tax.⁴ FICA is not refundable at tax time; it goes toward your future Social Security and Medicare benefits.

The Student FICA Exception

One exception matters to a lot of part-time workers. If you’re enrolled at least half-time at the school, college, or university that employs you, your wages from that job are exempt from FICA.⁵ You have to be regularly attending classes, and the work has to be incidental to your studies. Half-time means at least half the workload the school considers full-time, and students in their final semester enrolled in the credits needed to finish also qualify.

The exception drops away if you’re a “professional employee” of the institution, which generally means you’re eligible for benefits like vacation, sick leave, or a retirement plan.⁵ A student working 15 hours a week at the campus library without benefits qualifies. A full-time staff member taking one class does not. The question is whether you’re primarily a student who works or an employee who studies.

The Multiple-Jobs Trap

If you hold two or more part-time jobs at once, each employer withholds as if that job were your only income, which means each one applies the full standard deduction in its calculations. If two jobs each pay $15,000, neither employer withholds much income tax because $15,000 is under the $16,100 deduction. But your combined $30,000 clears the deduction by $13,900, and that whole amount is taxable. The result is a bill in April that catches people by surprise.

Form W-4 handles this in Step 2, which asks about multiple jobs. The IRS Tax Withholding Estimator at irs.gov is the most accurate way to set the right amount because it uses your actual numbers from each job.⁶ Update your W-4 whenever your pay, hours, or filing status changes.

The opposite problem shows up too. Irregular hours can push a single large paycheck through a withholding formula that treats it as your normal rate, pulling out more income tax than you’ll actually owe. If you had no tax liability last year and expect none this year, you can claim exemption from income tax withholding on your W-4, and your employer will stop withholding income tax (though FICA keeps coming out).⁶

When You Have to File, and Why You Should Anyway

You’re generally required to file a federal return if your gross income exceeds the standard deduction for your filing status. For a single filer under 65 in 2026, that’s $16,100.¹ Below that, the IRS doesn’t require a return. You’re also required to file if you had net self-employment income of $400 or more, no matter the total.

Not required to file isn’t the same as shouldn’t. If your employer withheld federal income tax during the year and your actual liability is zero, the only way to get that money back is to file a return.⁷ The IRS won’t refund it on its own. A student who earned $8,000 and had $400 withheld across the year gets all $400 back only by filing Form 1040.

Refundable credits make the case stronger. The Earned Income Tax Credit is designed for low- and moderate-income workers. For 2026 a single filer with no children can receive a maximum credit around $664, and a filer with three or more children can receive over $8,200. Income phaseouts run from roughly $19,500 for a childless single filer to around $70,000 for a married couple with three or more children.⁸ Because it’s refundable, you can receive it even owing no income tax, but only if you file.

Workers with children under 17 may qualify for the Child Tax Credit, worth up to $2,000 or more per qualifying child depending on income. Part of that is refundable through the Additional Child Tax Credit, which requires at least $2,500 in earned income — a floor most part-time schedules clear easily.⁹

Skipping a return because you assume you owe nothing can mean walking away from hundreds or thousands of dollars. On the other side of the ledger, if you do owe tax and file late, the failure-to-file penalty is 5% of unpaid tax per month up to 25%, with a minimum of $525 or the full balance (whichever is less) once a return is more than 60 days late.¹⁰

If You’re Paid as a 1099 Contractor Instead

Everything above assumes a W-2. If your part-time work is paid as independent contracting on Form 1099-NEC, the picture shifts.

FICA becomes self-employment tax, and you pay the full 15.3% yourself — both the employee and employer shares. On $20,000 of net self-employment income, that runs roughly $3,060, versus $1,530 in FICA for a W-2 worker at the same wage. You can deduct half of the self-employment tax when figuring adjusted gross income, which softens the hit.¹¹

No one withholds tax from a contractor’s checks, so you make estimated quarterly payments using Form 1040-ES to cover both self-employment tax and income tax.¹² Missing those can trigger an underpayment penalty, though you avoid it if you owe less than $1,000 after credits or paid at least 90% of the current year’s tax or 100% of the prior year’s.¹³ The $400 filing threshold mentioned earlier applies here: any net self-employment income at or above that requires a return, even if you’d otherwise be under the standard deduction.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Understanding Employment Taxes
3
Internal Revenue Service. Topic No. 751 Social Security and Medicare Withholding Rates
4
Social Security Administration. Contribution and Benefit Base
5
Internal Revenue Service. Student FICA Exception
6
Internal Revenue Service. Topic No. 753 Form W-4 Employees Withholding Certificate
7
Internal Revenue Service. Check if You Need to File a Tax Return
8
Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables
9
Internal Revenue Service. Child Tax Credit
10
Internal Revenue Service. Failure to File Penalty
11
Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
12
Internal Revenue Service. Estimated Tax for Individuals
13
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty