Compare pay stubs from equivalent pay periods, then account separately for regular gross earnings, taxes, benefits, and other deductions. Compare net pay only after reconciling those lines. A raise can increase gross pay without increasing take-home pay by the same amount.
Compare equivalent pay periods first
Write down each statement’s pay-period start and end dates, payday, pay frequency, and the hours or days it covers. A paycheck spanning the date a raise took effect may include only part of the period at the new rate, so it is not a clean old-versus-new comparison.
Also flag anything other than regular salary earnings, such as overtime, a bonus, commission, retroactive pay, or another adjustment. The IRS lists overtime, bonuses, commissions, and retroactive pay increases as examples of supplemental wages in Publication 15 (2026). Compare these items separately rather than treating them as part of ordinary salary pay.
Compare regular gross earnings
Gross pay is earnings before deductions; a pay statement shows earnings for the covered period. Compare regular salary or ordinary-hours earnings across equivalent periods. An annual salary in a compensation notice is not directly comparable with one paycheck’s gross-pay amount.
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If the first check after the change does not appear to reflect the new rate, confirm the effective date and how payroll handled the transition period with your employer. The Consumer.gov paycheck guide explains that a pay statement shows what you earned and what was taken out.
Reconcile every tax and deduction line
List the old and new amounts for each line instead of focusing on one total. Separate taxes from benefits and other deductions; some amounts may be fixed, while others may vary with earnings, elections, or payroll settings.
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- Federal income tax withholding
- State or local income tax, where applicable
- Social Security and Medicare
- Retirement contributions
- Health coverage
- Other deductions shown on the statements
Employers withhold taxes and may deduct benefits such as health insurance or retirement savings, as Consumer.gov notes. If a line changed, identify whether it is a tax withholding, a fixed deduction, or a contribution tied to a percentage or enrollment choice.
Compare net pay after the line-by-line check
Net pay is the amount received after deductions, often called take-home pay. The IRS defines it in its Understanding Taxes tutorial. To explain why net pay changed, reconcile the increase or decrease in gross earnings against each change in withholding and deductions. A smaller increase in take-home pay than in gross pay does not, by itself, show that the salary calculation is wrong.
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Keep current-period figures separate from year-to-date totals
For a check-to-check comparison, compare each stub’s current-period federal income tax withheld. YTD withholding is cumulative: it includes amounts withheld earlier in the year, potentially under the prior salary. It is useful for reviewing totals so far, but it is not a like-for-like replacement for current-period figures when a salary changes midyear.
The IRS Tax Withholding Estimator distinguishes per-period withholding from YTD amounts in its Income and Results guidance.
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Check whether federal withholding needs attention
Federal income tax withholding is not determined by headline annual salary alone. IRS guidance says it depends on earnings in each payroll period, the payroll period, and the information on Form W-4. Publication 505 (2026) advises checking withholding after personal or financial changes and comparing projected withholding with estimated tax liability. The IRS writes: “Always check your withholding if there are personal or financial changes in your life or changes in the law that might change your tax liability.” See Publication 505.
The IRS estimator recommends checking again after receiving a pay statement that reflects new income. If its estimate suggests withholding may be too high or too low, follow the estimator’s instructions and consider whether updating Form W-4 is appropriate. See the IRS Tax Withholding Estimator and IRS Topic 753: Form W-4.
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Ask payroll about a mismatch
If regular salary earnings or the effective date do not match your compensation notice, ask payroll or HR to confirm the effective date, pay-period treatment, and any partial-period or retroactive adjustment. If a deduction changed, ask which enrollment election, plan rate, or payroll setting was applied.
Whether a specific paycheck is wrong—or whether an employer complied with applicable pay-statement rules—depends on the actual statements, employer records, work arrangement, and jurisdiction. Federal guidance alone cannot resolve an individual payroll calculation, and state or local requirements may differ.
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