Labor income is taxed in two parallel systems: federal income tax (and usually state income tax) applies to what you earn after deductions, using graduated rates that rise with income, while payroll taxes for Social Security and Medicare take a flat 7.65 percent from your paycheck starting with your first dollar. If you work for yourself instead of an employer, you pay both halves of the payroll tax and cover the whole 15.3 percent yourself. How labor income is taxed in practice depends on how much you earn, your filing status, where you live, and whether taxes come out of a paycheck or you send them in on your own.
What Counts as Pay for Tax Purposes
The Internal Revenue Code defines gross income as “all income from whatever source derived,” and compensation for services is the first item on its list.1Office of the Law Revision Counsel. 26 U.S. Code 61 – Gross Income Defined Salaries, hourly wages, commissions, tips, bonuses, severance, and the cash value of many fringe benefits all count.
For withholding, the code uses a slightly narrower “wages” definition that still captures nearly all remuneration for employee services, including non-cash benefits.2Office of the Law Revision Counsel. 26 U.S. Code 3401 – Definitions A few narrow categories are carved out, including active-duty combat-zone pay, some agricultural and domestic work, and ministerial duties performed by ordained ministers. For a typical worker on a regular paycheck, essentially everything the employer pays is taxable.
Federal Income Tax Brackets and How They Work
Federal income tax is progressive. Your first dollars of taxable income are taxed at the lowest rate; only the dollars that spill into the next bracket are taxed at the higher rate. For 2026, there are seven brackets running from 10 percent to 37 percent.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
The 2026 brackets for single filers and married couples filing jointly:
- 10%: up to $12,400 single; up to $24,800 joint
- 12%: over $12,400 to $50,400 single; over $24,800 to $100,800 joint
- 22%: over $50,400 to $105,700 single; over $100,800 to $211,400 joint
- 24%: over $105,700 to $201,775 single; over $211,400 to $403,550 joint
- 32%: over $201,775 to $256,225 single; over $403,550 to $512,450 joint
- 35%: over $256,225 to $640,600 single; over $512,450 to $768,700 joint
- 37%: over $640,600 single; over $768,700 joint
People often assume that crossing into a higher bracket means all their income gets taxed at that higher rate. It does not. A single filer with $55,000 in taxable income pays 22 percent only on the slice above $50,400. The rest stays at 10 and 12 percent.
The Standard Deduction Comes Off First
Before any bracket applies, you subtract either the standard deduction or your itemized deductions from your gross income. Most filers take the standard deduction, which for 2026 is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill A single filer earning $16,100 or less would owe no federal income tax at all, though payroll taxes still apply to every dollar of wages.
When You Have to File
You generally must file a federal return if your gross income exceeds the standard deduction for your filing status and age. Self-employment has a much lower trigger: $400 in net self-employment earnings requires a return regardless of total income.4Internal Revenue Service. Check if You Need to File a Tax Return Even if you’re not required to file, it can be worth filing when an employer withheld taxes or you qualify for refundable credits, because that’s the only way to get that money back.
State and Local Income Taxes
Most states also tax wages, but the structures vary widely. Some use a flat rate, others have their own progressive brackets, and nine states have no individual income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. Some cities and counties add a local income tax on top, especially in parts of the Midwest and Mid-Atlantic.
Where you live and work changes your total tax burden significantly. Someone earning $75,000 in Texas takes home more per paycheck than someone earning the same amount in a state with a 5 percent income tax. If you’re comparing job offers or thinking about relocating, the state and local piece belongs in the calculation alongside the salary itself.
FICA Payroll Taxes: Social Security and Medicare
Separate from income tax, every paycheck also faces FICA taxes. These start with your first dollar of wages. There’s no standard deduction or personal exemption to shrink the base.
Social Security
Social Security tax is 6.2 percent from the employee and 6.2 percent from the employer, a combined 12.4 percent.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax It only applies up to an annual wage base, which is $184,500 for 2026.6Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet Wages above that level are not subject to the Social Security portion for the rest of the year. High earners sometimes notice their paychecks growing late in the year for exactly this reason.
Medicare
Base Medicare tax is 1.45 percent from your pay and 1.45 percent from the employer, with no wage cap.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax An Additional Medicare Tax of 0.9 percent hits wages above $200,000 for single filers or $250,000 for married couples filing jointly.7Internal Revenue Service. Topic No. 560, Additional Medicare Tax Employers must start withholding the extra 0.9 percent once wages pass $200,000 regardless of filing status, so married couples whose combined earnings trigger the tax at $250,000 may have to reconcile the amount when they file.
What This Looks Like on a Real Paycheck
Adding it up, most employees pay 7.65 percent of wages in FICA (6.2 percent Social Security plus 1.45 percent Medicare), and the employer matches. On a $60,000 salary that’s $4,590 out of your check and another $4,590 the employer pays on top. The employer’s half never shows on your pay stub, but it’s a real cost of employing you.
If You Work for Yourself: Self-Employment Tax
Freelancers, independent contractors, and sole proprietors pay both sides of FICA themselves: 12.4 percent for Social Security and 2.9 percent for Medicare, totaling 15.3 percent of net self-employment earnings.8Social Security Administration. Contribution and Benefit Base The Social Security portion still caps at the $184,500 wage base, and the 0.9 percent Additional Medicare Tax applies at the same thresholds as for employees.7Internal Revenue Service. Topic No. 560, Additional Medicare Tax
There is a partial offset. You can deduct the employer-equivalent half of your self-employment tax when calculating adjusted gross income.9Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) That lowers your income tax but does not reduce the self-employment tax itself. Seeing 15.3 percent come off the top is one of the biggest surprises for people moving from W-2 work to freelancing.
How to Lower the Taxable Portion of Your Pay
Not every dollar on your gross pay stub gets taxed. Certain pre-tax payroll deductions reduce taxable income before the IRS applies its rates. The two big ones are contributions to an employer-sponsored retirement plan and premiums for employer-provided health insurance.
For 2026, you can defer up to $24,500 of salary into a 401(k), 403(b), or similar workplace plan.10Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026; IRA Limit Increases to $7,500 Workers 50 and older can add another $8,000 in catch-up contributions, and those aged 60 through 63 get a higher catch-up limit of $11,250. Pre-tax 401(k) contributions cut your federal income tax for the year, but they don’t reduce your Social Security or Medicare wages.
Health insurance premiums paid through a Section 125 cafeteria plan, along with contributions to a health savings account or flexible spending account, also come out before taxes. Cafeteria-plan deductions usually reduce both income tax and FICA, which makes them especially valuable per dollar.
How the Taxes Actually Get Collected
Two collection methods cover almost everyone: employer withholding for people on payroll, and quarterly estimated payments for those without a paycheck to withhold from.
Employer Withholding
If you’re an employee, your employer withholds federal income tax from each check and sends it to the IRS.11Internal Revenue Service. Tax Withholding for Individuals How much depends on what you put on Form W-4 when you start a job (or when you update it later).12Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate Too little withheld means a balance due at filing; too much means a refund, but also that you’ve handed the government an interest-free loan for the year. Revisiting your W-4 after marriage, a new child, or the start of side income keeps things aligned.
FICA is withheld automatically. Your employer takes your 6.2 percent Social Security share and 1.45 percent Medicare share from every check and sends those amounts along with the employer match.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
Estimated Payments
Self-employed people and others without withholding make quarterly estimated tax payments covering both income tax and self-employment tax.13Internal Revenue Service. Estimated Taxes For the 2026 tax year, payments are due April 15, June 15, and September 15 of 2026, and January 15, 2027. If a due date lands on a weekend or holiday, the payment is timely if made the next business day.14Internal Revenue Service. Estimated Tax
Penalties for Filing or Paying Late
The IRS charges separate penalties for filing late and for paying late, and they can stack.
The failure-to-file penalty is 5 percent of the unpaid tax for each month or partial month a return is overdue, up to 25 percent.15Internal Revenue Service. Failure to File Penalty The failure-to-pay penalty is much smaller, 0.5 percent per month on the unpaid balance, also capped at 25 percent.16Internal Revenue Service. Failure to Pay Penalty When both apply in the same month, the failure-to-file penalty drops by 0.5 percent so the combined charge stays at 5 percent per month. The takeaway is simple. If you can’t pay what you owe, file anyway. Skipping the filing is ten times more expensive than skipping the payment.
On an approved installment plan, the failure-to-pay rate drops to 0.25 percent per month.16Internal Revenue Service. Failure to Pay Penalty Ignore an IRS notice of intent to levy and it climbs to 1 percent per month. Interest runs on top of all of it.
Underpayment Penalty
Owing a big balance at filing because too little came in during the year can trigger an underpayment penalty. Two safe harbors avoid it: pay at least 90 percent of your current-year tax liability, or pay 100 percent of what you owed the prior year.17Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty If your prior-year adjusted gross income was over $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110 percent. For someone with uneven income, like a freelancer coming off an unusually strong year, the prior-year benchmark is often the easier one to hit.