A paycheck can include income-tax withholding, Social Security and Medicare taxes, retirement contributions, benefit premiums, and other authorized or required deductions. In 2026, the ordinary employee Social Security and Medicare rates are 6.2% and 1.45%, applied to their respective covered wages. Income withholding and benefit deductions vary. Read each line rather than assuming a fixed percentage disappears from every paycheck. (IRS Topic 751)
Identify what each deduction pays for
Separate taxes from money directed to benefits or savings. They all reduce cash received, but they have different purposes and rules.
| Paycheck item | Where it goes | What determines it |
|---|---|---|
| Federal income withholding | Payment toward federal income tax | Taxable wages and W-4 information |
| State or local withholding | Relevant tax authority | Jurisdiction and applicable rules |
| Social Security and Medicare | Federal payroll taxes | Covered wages, rates, and thresholds |
| Employee retirement contribution | Retirement plan | Election and plan rules |
| Benefit premium | Selected benefit coverage | Enrollment and employer plan |
| Other deduction | Depends on the item | Agreement, election, or legal requirement |
An employer-paid amount displayed on the stub may be informational. Do not subtract the employer’s contribution again when checking your own net pay. The pay-stub walkthrough shows how to distinguish the columns; the paychecks collection covers related questions.
How do Social Security and Medicare work in 2026?
Social Security has an annual wage base; ordinary Medicare tax does not. For 2026, the Social Security base is $184,500, verified with the Social Security Administration. Applying the employee rate of 6.2% to that base gives $11,439.
Additional Medicare withholding is a separate rule: an employer begins withholding an extra 0.9% on wages it pays above $200,000 in the calendar year, regardless of filing status. Final Additional Medicare Tax liability uses filing-status thresholds and may differ from payroll withholding. These rules are described in IRS Topic 751.
This guide concerns ordinary covered employee wages. Exempt employment and special circumstances require their own checks. If you have multiple employers or an unexplained wage-base calculation, ask payroll or a tax professional rather than assuming the latest deduction is wrong.
Income-tax withholding is a payment toward tax
Federal withholding uses taxable wages and the information supplied on Form W-4. The IRS withholding guidance explains those inputs. The annual return reconciles tax with payments and applicable credits.
Reducing withholding can increase today’s deposit without reducing the tax ultimately owed. Increasing withholding can reduce the deposit without making the underlying tax liability larger. That distinction matters when someone asks how to “pay less tax” through payroll.
State and local deductions need separate review. A state without a broad wage income tax may still have other payroll deductions. Use the relevant agency’s rules and your employer’s explanation; do not interpret a missing state income-tax line as proof that every non-federal deduction is an error.
Review withholding after a material income or household change. Have current pay records available, and follow current official instructions rather than copying a coworker’s W-4 settings.
Why does “pre-tax” need a second question?
Ask which tax a deduction reduces. Traditional retirement deferrals and benefit arrangements do not all have the same treatment.
A traditional 401(k) employee deferral generally reduces federal income-tax wages while remaining subject to Social Security and Medicare. A designated Roth deferral is included in current income. See IRS Topic 424. Qualified benefits under a cafeteria plan may have different exclusions; IRS Publication 15-B describes the rules and exceptions.
For an unfamiliar benefit line, confirm:
- The employee amount and the employer amount.
- Whether it reduces federal, state, or payroll-tax wages.
- The effective date and any catch-up deduction.
A retirement contribution is not a bill that simply vanishes. It moves compensation into a retirement plan, subject to its rules. Decide whether the election fits your cash needs and long-term plan, rather than changing it only because net pay looks smaller.
Follow a complete deduction example
Subtract only the defined employee amounts to reconcile this simplified paycheck. All figures below are illustrative except the stated ordinary payroll-tax rates.
Taylor earns $2,000 and contributes $100 to a traditional 401(k). Federal withholding is assumed to be $150 and state withholding $50; these are not personalized estimates. A $40 benefit deduction is explicitly post-tax. All $2,000 remains covered Social Security and Medicare wages, below the thresholds.
| Deduction | Calculation or assumption | Amount |
|---|---|---|
| Federal income tax | Assumed | $150 |
| State income tax | Assumed | $50 |
| Social Security | $2,000 × 6.2% | $124 |
| Medicare | $2,000 × 1.45% | $29 |
| Traditional 401(k) | Chosen contribution | $100 |
| Post-tax benefit | Assumed election | $40 |
| Total | $493 |
Net pay is $2,000 − $493 = $1,507. Federal income-tax wages in this simplified example are $1,900, but the assumed withholding is an input rather than a calculation from that wage base.
Taylor's $493 of employee deductions
The gross-versus-net guide explains these definitions. For a new or changed payment, understanding your paycheck adds the timing and deposit checks.
Check changes before altering an election
Compare the current deduction with its prior amount and the supporting record. A new premium, tax-base change, or catch-up amount may explain the difference.
Ask payroll for the line’s meaning, the applicable election or rule, and the period it covers. Keep the answer with the statement. If a correction is needed, confirm it in the payment and year-to-date figures.
Before changing a deduction:
- Identify whether it is tax, saving, coverage, or another obligation.
- Understand what the change affects beyond this deposit.
- Confirm when the new amount will begin.
A one-time payment can use a different withholding method. The bonus withholding guide works through a $5,000 example.
The paycheck calculator estimates each of these deductions for all 50 states and DC. The California and Illinois paycheck calculators can help you explore how the state-tax estimate affects take-home pay. Check the calculator assumptions and use your pay stub to identify the amounts actually withheld.
Frequently asked questions
What does FICA mean on my paycheck?
It refers to Social Security and Medicare payroll taxes. The ordinary employee rates, wage limits, and additional Medicare withholding rules are summarized above with IRS and SSA sources.
Does a traditional 401(k) reduce Social Security tax?
Generally no. Traditional employee deferrals reduce current federal income-tax wages but remain subject to Social Security and Medicare taxes. Other benefit deductions can have different treatment.
Can changing my W-4 lower my tax bill?
A W-4 changes withholding instructions. A lower withheld amount is not automatically a lower final tax liability. Use current tax information to match payments to the expected obligation.
Is the employer’s matching contribution taken from my paycheck?
An employer match is separate from your own contribution. Verify the stub’s labels and plan records rather than counting an employer informational line as another employee deduction.
