There is no fixed set of five mandatory deductions on every U.S. paycheck. Covered employee wages generally have Social Security and Medicare deductions, while federal income tax withholding depends on the applicable calculation. State or local taxes, covered state programs and legal withholding orders depend on the worker's circumstances. Benefit elections are a separate category, and employer-only payroll costs should not be subtracted again from employee net pay.
Reviewed November 1, 2026 · U.S. employee payroll, with specified 2026 tax figures. Coverage, wage definitions, exemptions, state requirements and individual orders can change the result. The paycheck below is a fictional reconciliation, not a personal tax calculation.
A long deduction list can make a paycheck difficult to read. The number of lines tells you little about whether each item is required. One employee may have several location-specific deductions; another may have no state income tax but have elected insurance and retirement contributions.
For each line, identify its authority, wage base, rate or amount, and whether it actually reduces your payment. Our guide to payroll responsibilities can help you find the right person to explain an unfamiliar code.
Which paycheck deductions are mandatory?
“Mandatory” should describe why money must be withheld in your situation. It does not mean every employer must display the same labels or withhold the same percentage from every worker.
| Category | Possible paycheck entries | What establishes the amount? |
|---|---|---|
| Federal tax withholding | Federal income tax, Social Security, Medicare | Covered wages, applicable rules and withholding information |
| State or local requirements | Income tax, covered disability or unemployment contributions | Jurisdiction, employment coverage and current program rules |
| Legal withholding action | Support withholding, garnishment or tax levy | The actual order or agency action and applicable limits |
| Employee benefit or payment arrangement | Insurance, retirement savings or other authorized deductions | Plan terms, enrollment, elections and applicable law |
| Employer information only | Employer FICA share or employer benefit contribution | Employer cost; check whether the display affects net pay |
This classification is a starting point. Some public employee retirement contributions, for example, are required by law. A retirement label alone does not establish that a contribution is voluntary.
Federal income tax and FICA are different calculations
Federal income tax withholding is not one universal rate
The IRS's employee withholding guidance explains the role of Form W-4 and withholding reviews. The amount depends on the applicable wage calculation, payroll frequency and W-4 information; it can differ between employees with the same gross check.
A zero federal income tax line does not by itself prove an error or a valid exemption. Ask which withholding setup produced it. Updating an accurate W-4 can change future withholding, but simply asking payroll to remove required tax without a valid basis is different.
Use our federal withholding calculator guide to understand the inputs and limitations of an estimate. Withholding is a payment toward tax; it is not a final calculation of everything owed on an annual return.
Social Security and Medicare have their own wage rules
IRS Topic 751 lists the ordinary employee rates as 6.2% for Social Security and 1.45% for Medicare, with separate employer shares. These rates apply to the relevant covered wages, which are not necessarily identical to every gross or taxable-wage figure on a statement.
For 2026, IRS Publication 15 sets the Social Security wage base at $184,500. Medicare has no equivalent annual wage cap. Once an employee’s Medicare wages from that employer exceed $200,000 in the calendar year, the excess also has 0.9% Additional Medicare Tax withholding. That payroll threshold is distinct from the employee’s final return calculation. There is no employer match for the additional tax.
Check the pay date's tax year and year-to-date wage base before comparing a late-year check with an earlier one. See our Social Security calculation guide and Medicare calculation guide for focused examples. Exempt employment and special worker categories need their own review.
State and local deductions depend on actual coverage
Location can add more than an income-tax line. California's Employment Development Department rate page, for example, specifies a 1.3% State Disability Insurance withholding rate for employees subject to SDI in 2026. That is a covered California program contribution, not a nationwide deduction.
Pennsylvania's employee unemployment contribution guidance describes employee withholding for covered employment. This illustrates why “unemployment tax is always employer-only” is too broad: federal FUTA and a state's employee contribution are different obligations.
Identify the exact state, local jurisdiction and program before applying a rate. A payroll code carried over after a move may need investigation, but residence alone does not settle every withholding question. Our cross-state tax guide explains why work location and reciprocity can also matter.
Do not combine several state programs into a guessed percentage. Ask payroll which agency receives each contribution and which wages it covers. A state calculator can help with a supported estimate; it does not establish eligibility for every leave, disability or local program.
Garnishments and benefit elections belong in separate checks
A legal withholding action can require a deduction that other workers do not have. The Department of Labor's wage garnishment guidance distinguishes court orders, levies and other legal procedures from voluntary wage assignments. Ask for the relevant notice, case reference, start date and contact for questions about the action.
The same guidance defines disposable earnings for garnishment using legally required deductions. That figure can differ from the paycheck's final take-home amount because voluntary insurance or retirement deductions usually do not reduce disposable earnings for this purpose. Ordinary debt, support and tax actions do not all share one percentage limit.
For benefits, compare the deduction with enrollment confirmations and the effective date. A new insurance election may begin on a different check from the enrollment date. A retirement contribution may follow an automatic-enrollment arrangement, an employee election or a legally required system. Ask which one applies rather than assuming every savings line is a tax.
Our part-time benefits guide covers the difference between benefit availability, actual enrollment and a paycheck deduction. Receiving a benefit explanation does not establish that the amount on a particular check is correct.
Worked example: reconcile a $2,500 gross check
Assume a covered employee has $2,500 of gross wages, all subject to ordinary Social Security and Medicare tax, below the relevant annual thresholds. This example assumes no pretax exclusions. Federal withholding of $210 and state withholding of $85 are supplied fictional payroll amounts, not results calculated from a filing status.
The employee also has an authorized $65 after-tax insurance deduction and a $125 designated Roth retirement contribution. Both are after-tax for this illustration. No local program, garnishment or other deduction is assumed.
| Entry | Basis in this example | Amount |
|---|---|---|
| Gross wages | Starting pay | $2,500.00 |
| Federal income tax | Assumed withholding | −$210.00 |
| Social Security | $2,500 × 6.2% | −$155.00 |
| Medicare | $2,500 × 1.45% | −$36.25 |
| State income tax | Assumed withholding | −$85.00 |
| After-tax insurance | Assumed authorized amount | −$65.00 |
| Designated Roth contribution | Assumed employee election | −$125.00 |
| Net pay | $2,500 − $676.25 | $1,823.75 |
The tax lines total $486.25; the two benefit deductions total $190. Together they reduce pay by $676.25. This checks the ledger, but it does not prove the assumed federal or state withholding is suitable for a real employee.
Should employer taxes reduce my net pay again?
Keep employer contribution columns separate when adding deductions. In this example the ordinary employer Social Security and Medicare shares would total another $191.25, but that employer expense is not subtracted a second time from the employee's $1,823.75.
Publication 15 also explains that FUTA is paid by the employer and is not withheld from employee wages. A statement may display employer costs for information. Check its deduction totals before assuming every displayed expense reduces your deposit.
What to do with an unexplained line
- Save the original statement and identify the code, pay date, current amount and year-to-date amount.
- Ask payroll for the full label, authority, calculation and effective date. Compare with your benefit election or relevant order.
- Check whether the issue is an incorrect wage base, duplicate deduction, delayed election or unfamiliar employer-information column.
- Request the correction process and a revised employer record if an error is confirmed. Do not edit the issued statement yourself.
Employer-required uniforms, tools and shortage deductions also have wage-law limits. The Department of Labor's FLSA reference guide explains that these deductions cannot cut into required minimum wage or overtime pay. State law can impose additional restrictions; obtain guidance for the actual deduction rather than assuming a signed authorization resolves every issue.
Paycheck questions
Is health insurance always mandatory?
No universal employee paycheck rule applies. Review your actual coverage, enrollment and plan terms.
Does gross minus taxes always equal my deposit?
No. Authorized benefit deductions and other applicable items can also affect net pay.
Does a smaller federal tax line mean my tax rate fell?
Not necessarily. Wage amounts, withholding inputs and payroll treatment can change the line.
Can a calculator explain every deduction code?
No. Use supported tax estimates alongside the actual payroll explanation, benefit records and applicable legal notices.
The Check Stubs Online Editorial Team reviewed current federal and state primary guidance and independently checked the example. Its purpose is to help reconcile a paycheck, with individual tax and wage-law questions reviewed in context.