Compare pay stubs for equivalent pay periods, then account separately for regular gross earnings, taxes, benefits, other deductions and net pay. A raise can increase gross pay without increasing take-home pay by the same amount. Dates, a partial transition period, one-time earnings and changes to deductions can all affect the comparison.
Start by matching the pay periods
Before comparing amounts, note each statement’s pay-period start and end dates, payday, pay frequency and the hours or days it covers. A check that spans the effective date of a raise may include only part of a period at the new salary, so it is not directly comparable with a full period at the old rate.
Mark any bonus, commission, overtime, retroactive pay or other adjustment separately. The IRS lists overtime, bonuses, commissions and retroactive pay increases as examples of supplemental wages; these amounts can make a check differ for reasons other than the regular salary change. See IRS Publication 15.
Compare regular gross earnings
Gross pay is what you earned before deductions; net pay is what you receive after deductions. Compare the regular salary or ordinary-hours earnings for equivalent periods, not the annual salary in a compensation notice against the gross amount on one paycheck. Pay statements show earnings for a particular period. The IRS explains gross and net pay, and Consumer.gov describes what a paycheck statement shows.
#1 Best Overall
- Calculates a paycheck for all 52 states and for all filing status (single, married, head of household ) and pay periods (daily, weekly, bi weekly, semimonthly, monthly, annually).
- Calculates a paycheck for hourly and salary employee.
- Pre-deduction (IRA, 401k, medical, eligible deduction etc) and post-deduction (child spouse support, judgement, medical, etc.) amounts are also taken into account while calculating a paycheck.
- Actual federal tax tables are used for calculations.
- Provides annual summary of gross pay, net pay, Federal tax holding, State Tax holdings, Social security and Medicare.
If the first check after the change is a transition period, confirm the raise’s effective date and how payroll handled the partial period. Ask payroll or HR if the regular earnings line does not align with the compensation notice.
Reconcile every tax and deduction line
Compare each line on both statements rather than treating all deductions as one total. Separate tax withholding from benefit and other deductions, and note whether a line is a fixed amount, a percentage or a withholding calculated from payroll information.
Rank #2
- Easy to use
- Paycheck calculator
- overtime/holiday
- Federal income tax withholding
- State or local income tax, where applicable
- Social Security and Medicare
- Retirement contributions
- Health coverage
- Other deductions
Employers withhold taxes and may deduct benefits such as health insurance or retirement savings. If a deduction changed, ask payroll what enrollment election, plan rate or payroll setting was applied. Consumer.gov’s paycheck guide explains common paycheck taxes and deductions.
Use net pay as the final check
After accounting for gross earnings and each deduction, compare net pay—the take-home amount. The difference between the gross-pay change and the net-pay change is explained by changes in withholding or deductions. A smaller-than-expected increase in take-home pay does not, by itself, show that the salary calculation is wrong.
Rank #3
- Calculates a paycheck for all 52 states and for all filing status (single, married, head of household ) and pay periods (daily, weekly, bi weekly, semimonthly, monthly, annually).
- Calculates a paycheck for hourly and salary employee.
- Pre-deduction (IRA, 401k, medical, eligible deduction etc) and post-deduction (child spouse support, judgement, medical, etc.) amounts are also taken into account while calculating a paycheck.
- Actual federal tax tables are used for calculations.
- Provides annual summary of gross pay, net pay, Federal tax holding, State Tax holdings, Social security and Medicare.
Keep current-period and year-to-date figures separate
For a check-to-check comparison, use the current-period amount for each line. Year-to-date (YTD) totals accumulate amounts from earlier pay periods, so they are not a like-for-like substitute when a salary changes during the year. YTD figures can still help with a cumulative review. The IRS Tax Withholding Estimator distinguishes per-period federal withholding from YTD withholding.
Check federal withholding if your situation calls for it
Federal income tax withholding is not determined by the 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. The IRS recommends checking withholding after personal or financial changes that could affect tax liability; its 2026 Publication 505 explains how to compare projected withholding with estimated tax liability.
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The IRS estimator advises checking again after receiving a pay statement that reflects new income. If the estimate suggests federal withholding is too high or too low, follow the estimator’s instructions and consider whether updating Form W-4 is appropriate. See the estimator’s Income and Results pages, as well as IRS Topic 753 on Form W-4.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Ask payroll about a discrepancy
If regular salary earnings or the effective date do not match your compensation notice, ask payroll or HR to confirm the effective date, the treatment of the pay period and whether a partial-period or retroactive adjustment was included. For a deduction change, ask which election, plan rate or payroll setting caused it.
Best Value
- Calculates paycheck for all provinces and territories (except Quebec ) and for all Federal, Provincial claim codes and pay periods (daily, weekly, bi weekly, semimonthly, monthly).
- Calculates a paycheck for hourly and salary employees.
- Medical, eligible deductions, child/spouse/alimony support, judgement and garnishment amounts are also taken into account while calculating a paycheck.
- Actual federal and Provincial tax formulas for 2014 are used for calculations.
- This app may help in budgeting and managing household expenses.
Whether a particular calculation is wrong can depend on the actual statements, employer records and work jurisdiction. Federal guidance alone cannot determine an individual payroll error or establish compliance with state or local pay-statement rules. The guidance here is for U.S. federal withholding and general paycheck review, not a complete guide to other countries.
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