How Much Federal Tax Is Deducted From Your PA Paycheck?

Three federal lines come out of every Pennsylvania paycheck: federal income tax withheld at bracket rates from 10% to 37%, Social Security tax at 6.2% on wages up to $184,500, and Medicare tax at 1.45% on all wages. High earners also see an extra 0.9% Medicare surtax once year-to-date pay crosses $200,000. How much federal tax is deducted from your PA paycheck depends on your gross pay, your pay frequency, and what you put on your W-4; the FICA pieces are fixed by law, and the income tax piece is the one you can actually move.

Social Security and Medicare: The Fixed Slice

FICA deductions come out regardless of filing status, W-4 entries, or how many dependents you claim.

Social Security: 6.2% of your wages, up to a maximum of $184,500 in earnings for 2026. Once your year-to-date pay passes that cap, Social Security withholding stops for the rest of the year.¹²
Medicare: 1.45% of all your wages, with no income cap.¹
Additional Medicare Tax: 0.9% on wages above $200,000 for most filers ($250,000 if married filing jointly). Your employer starts withholding this once your pay crosses $200,000 in the calendar year, regardless of filing status.¹

Your employer matches the 6.2% Social Security and 1.45% Medicare contributions, but the match is paid by the company and doesn’t show up on your pay stub. For a worker earning $70,000, the employee-side FICA total runs about $5,355 per year: $4,340 for Social Security and $1,015 for Medicare.

2026 Federal Income Tax Brackets

Federal income tax is progressive: each slice of your income is taxed at a successively higher rate as earnings climb.³ Filing status determines where each bracket begins. For 2026, the seven brackets for single filers and married couples filing jointly are:⁴

10%: income up to $12,400 (single) or $24,800 (married filing jointly)
12%: $12,401 to $50,400 (single) or $24,801 to $100,800 (joint)
22%: $50,401 to $105,700 (single) or $100,801 to $211,400 (joint)
24%: $105,701 to $201,775 (single) or $211,401 to $403,550 (joint)
32%: $201,776 to $256,225 (single) or $403,551 to $512,450 (joint)
35%: $256,226 to $640,600 (single) or $512,451 to $768,700 (joint)
37%: income above $640,600 (single) or above $768,700 (joint)

Only the dollars inside each range get taxed at that range’s rate. A single filer with $60,000 in taxable income pays 10% on the first $12,400, 12% on the next $38,000, and 22% only on the final $9,600. The effective rate, averaged across every bracket touched, ends up well below the highest one.

The Standard Deduction Comes Off First

The bracket math doesn’t run on your full gross pay. Your employer assumes a standard deduction, which shrinks the income subject to withholding. For 2026, that deduction is $16,100 for single filers and married filing separately, $32,200 for married couples filing jointly, and $24,150 for head of household.⁴ A single worker making $55,000 would end up with roughly $38,900 of taxable income, putting most of their pay in the 10% and 12% brackets.

How Your Employer Calculates Federal Income Tax Withholding

Federal law requires every employer to deduct and withhold income tax from your wages each pay period.⁵ The amount depends on three things: your gross pay for the period, how often you’re paid, and the information on your Form W-4.⁶

Form W-4 tells your employer your filing status, whether you have income from a second job or a working spouse, how much to reduce withholding for dependent tax credits, and whether you want an extra flat dollar amount taken out each check. The form no longer uses the old allowances system. Submit a fresh W-4 whenever your situation changes: marriage, a new child, a second job.

Using your W-4 entries, your employer applies the formulas in IRS Publication 15-T.⁷ Payroll software generally uses one of two approaches: the Wage Bracket Method, which looks up withholding in predefined charts, or the Percentage Method, which runs an exact calculation. Both produce similar results.

Pre-Tax Deductions Shrink the Federal Bite

Before withholding is calculated, your employer subtracts your pre-tax contributions. The common ones are 401(k) or 403(b) retirement contributions and premiums for employer-sponsored health insurance. These lower the income your employer plugs into the withholding formula, so contributing to a pre-tax retirement plan or health plan reduces every paycheck’s federal tax. A worker earning $70,000 who puts $5,000 into a 401(k) has federal withholding calculated on $65,000.

Bonuses, Commissions, and Other Supplemental Pay

When you get a bonus, commission, or other supplemental wages, your employer can withhold federal income tax at a flat 22% instead of running the payment through the regular bracket method.⁷ If your supplemental wages exceed $1 million in a calendar year, the mandatory rate jumps to 37% on anything above that threshold. FICA still applies the same way it does to regular pay.

The 22% flat rate may take out too much for lower earners or too little for high ones. Either way, the difference is reconciled on your annual return.

Claiming Exempt From Federal Income Tax Withholding

If you had no federal income tax liability last year and expect none this year, you can write “Exempt” on your W-4 and stop federal income tax withholding entirely.⁸ This mainly applies to workers whose earnings fall below the filing threshold. An exempt W-4 is valid only for the calendar year you submit it; you have to file a new one by February 15 of the following year, or your employer resumes withholding at the default rate. FICA still comes out even when you’re exempt from income tax withholding.

A Sample Biweekly PA Paycheck

Take a single Pennsylvania worker with no dependents earning $60,000 per year, paid biweekly across 26 pay periods. Each gross check runs about $2,308. The federal lines break down roughly like this:

Federal income tax: around $175 to $210 per check, depending on W-4 choices, which works out to an effective rate near 8% to 10% at this income level
Social Security: $143.08 per check (6.2% of $2,308)
Medicare: $33.47 per check (1.45% of $2,308)

The federal income tax portion is the one that moves most, because it’s shaped by your W-4 selections, pre-tax contributions, and filing status. Boosting your 401(k) contribution or updating your W-4 after a qualifying event are the direct levers you have on what the IRS takes from each check.

Avoiding Federal Underpayment Penalties

If your withholding plus any estimated payments doesn’t cover enough of your annual federal tax, the IRS may charge an underpayment penalty. You avoid it by meeting at least one of these safe harbors:⁹

90% rule: your total withholding and payments cover at least 90% of the tax you owe for the current year
100% rule: your total withholding and payments equal at least 100% of the tax shown on last year’s return (110% if your prior-year adjusted gross income exceeded $150,000, or $75,000 if married filing separately)
Under $1,000 owed: no penalty applies if your return shows you owe less than $1,000 after subtracting withholding and credits

Workers with side income, freelance earnings, or significant investment gains are most exposed, since employer withholding only covers wage income. If that’s you, request additional withholding on Line 4(c) of your W-4 or send quarterly estimated payments to the IRS.

What’s Not Federal on Your PA Stub

Other lines on your Pennsylvania pay stub are not federal and are calculated separately from the amounts above. Pennsylvania withholds a flat 3.07% state income tax,¹⁰ most municipalities and school districts collect a local earned income tax,¹¹ many jurisdictions add a Local Services Tax capped at $52 a year,¹² and Pennsylvania also deducts a small 0.07% employee unemployment contribution.¹³ Those are state and local amounts; none of them count toward what the IRS collects.

1
Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
2
Social Security Administration. Contribution and Benefit Base
3
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
4
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
5
Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
6
Internal Revenue Service. Form W-4 (2026)
7
Internal Revenue Service. 2026 Publication 15-T Federal Income Tax Withholding Methods
8
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
9
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
10
Department of Revenue | Commonwealth of Pennsylvania. Tax Rates
11
PA Department of Community and Economic Development. Local Income Tax Information
12
PA Department of Community and Economic Development. Local Services Tax
13
Department of Labor and Industry | Commonwealth of Pennsylvania. Yearly Tax Highlights