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Comparing Two Paychecks: Raise, New State, or New Frequency?
A raise, a job offer in a different state, or a switch from biweekly to monthly pay all sound like simple wins — more money, or the same money on a different schedule. The only way to know for sure is to run both scenarios through the same calculator and compare net pay, not gross pay. Here's how to do that comparison properly, plus two related situations — dependents and bonus paychecks — worth understanding even though this tool doesn't model them yet.
Every one of these questions has the same shape: two hypothetical paychecks, one calculator, and a side-by-side reading of the net-pay line rather than the gross-pay line. The paycheck calculator on ToolPico doesn't have a built-in "compare two scenarios" view yet — you run it once, note the result, change the inputs, and run it again — but the comparison itself is straightforward once you know which inputs to hold constant and which to change.
Comparing a raise: gross-pay math lies
Quick answerRun your current gross pay through the calculator and note net pay per paycheck. Re-run it with the new gross pay, same filing status, state, and deductions. Compare the two net-pay numbers — the gap is usually smaller than the raise itself, because more of the raise lands in a higher marginal bracket and, below the Social Security wage base, still owes the full 7.65% FICA rate.
Say a hypothetical single filer in a no-income-tax state goes from $70,000 to $85,000 a year, paid biweekly, no 401(k). That's a $15,000 gross raise — about $577 more per paycheck before anything is withheld. Run both numbers through the calculator and the after-tax gap will typically land somewhere in the $420-$460/paycheck range in a scenario like this, purely illustrative — because the additional income is taxed at your marginal rate (potentially a higher bracket than your average rate) rather than your old average rate. The lesson isn't the exact number; it's to never assume a raise flows through dollar-for-dollar.
Comparing a move to a new state
Quick answerIf gross salary stays the same and you're moving to one of the nine no-income-tax states, set the state tax rate to 0% for the new scenario and compare net pay directly — it will be higher. If the new job also changes the gross salary (common with relocations), compare full scenarios, not just the state-tax line, since a lower cost-of-living offer can offset or exceed the tax savings.
The calculator's state selector already flags the nine states with no wage income tax automatically. For everywhere else, you supply an estimated flat state rate rather than the exact bracket structure — which is fine for this kind of side-by-side comparison, since you're looking at the relative difference between two scenarios, not an exact dollar figure for either one.
Why "same job, different state" isn't always a clean before/afterTwo offers with identical gross salary in different states isolate the tax difference cleanly. But real relocation offers often bundle a salary change with the state change — a company moving someone from a high-cost coastal state to a lower-cost inland state may adjust the offer downward even before tax is considered. Compare full net-pay scenarios, not the state-tax delta in isolation.
Comparing pay frequencies at the same salary
Quick answerAt the same annual salary, switching pay frequency (e.g. biweekly to monthly) changes the size of each individual paycheck and how the estimated annual tax is spread across the year, but the calculator's underlying annual gross, annual federal tax, and annual FICA stay the same — because tax is calculated on annualized pay first, then divided back down.
This matters most when comparing a biweekly job (26 paychecks/year) to a semi-monthly one (24 paychecks/year) at the same salary — the per-paycheck net will differ noticeably even though the annual total is nearly identical, which surprises people who expect two "twice-a-month-ish" schedules to produce the same paycheck size.
Example only — $60,000/yr salary, single filer, no-tax state, no deductions, by frequency
Frequency
Paychecks/yr
Approx. net/paycheck
Weekly
52
~$923
Biweekly
26
~$1,846
Semi-monthly
24
~$2,000
Monthly
12
~$4,001
These figures are illustrative, rounded, and assume identical annual gross and no deductions — they're meant to show the shape of the difference, not to be used as a substitute for running your own numbers. A calculator feature some users have asked for is a dual-scenario view that shows two paychecks side by side on one screen instead of switching inputs back and forth — worth watching for in a future update, but for now the compare-and-note-the-difference approach above works with the tool as it exists today.
What about dependents and the Child Tax Credit?
Quick answerThe Child Tax Credit can reduce annual federal tax liability by up to $2,000 per qualifying child for 2025 (subject to income phase-outs), but this calculator's advanced-deductions panel — which currently covers 401(k), pre-tax health insurance, and post-tax deductions — doesn't yet include a dependents input, so its federal tax estimate doesn't account for this credit.
If you're comparing two paycheck scenarios and one of you claims dependents, keep in mind that the calculator's federal tax line is a pre-credit estimate in that case — actual withholding (via your W-4's dependents section) and your eventual tax return will typically come out lower than what the tool shows. A simple dependents input — number of qualifying children multiplied by the credit amount, subtracted from annual federal tax — is a natural extension for a tool like this; until it exists, treat any household-with-kids comparison as directionally useful but not exact on the federal tax line specifically.
What about a bonus paycheck?
Quick answerEmployers commonly withhold federal tax on bonuses one of two ways: the percentage method (a flat 22% federal rate on supplemental wages, for bonuses under $1 million total in a year) or the aggregate method (the bonus is added to that period's regular wages and taxed together, which can temporarily look like a bigger withholding hit). This calculator doesn't have a dedicated bonus mode yet.
Until a dedicated bonus mode exists, you can approximate the aggregate method today by simply adding your bonus amount to your gross pay for a single pay period and running the calculator once for that period — the tool will annualize the combined amount the same way it does for any other paycheck. A future "Bonus Paycheck Calculator" as a companion mini-tool — modeling both the percentage and aggregate methods side by side — would remove the need for that manual workaround, similar to the Hourly-to-Salary and Overtime mini calculators already sitting alongside the main tool.
Run your own raise, relocation, or frequency comparison — enter each scenario's numbers and read off the net-pay result.
How do I compare a raise against my current paycheck?
Run your current gross pay through the calculator, note the net pay per paycheck, then re-run it with the new (higher) gross pay and the same filing status, state, and deductions. The difference between the two net-pay results — not the difference in gross pay — is what actually lands in your account, since a higher gross pay usually pushes more income into higher marginal brackets and increases FICA up to the Social Security cap.
Does moving to a state with no income tax always increase take-home pay?
Usually, but not automatically — it depends on the offer. If a new job in a no-income-tax state pays the same gross salary as your current job, dropping the state tax rate to 0% in the calculator will show a higher net pay. But if the new offer has a lower gross salary (common when cost of living is lower), you need to compare both changes together, not just the tax difference.
Why would switching from biweekly to semi-monthly pay change my numbers even at the same salary?
Biweekly pay (26 paychecks/year) and semi-monthly pay (24 paychecks/year) annualize to the same yearly gross and, in this calculator, the same estimated annual tax — but the amount withheld per paycheck differs because it's spread across a different number of pay periods. Semi-monthly paychecks are larger individually since there are fewer of them across the year.
Does having children change my paycheck withholding?
Qualifying dependents can reduce your federal tax liability through the Child Tax Credit (up to $2,000 per qualifying child for 2025, subject to phase-outs at higher incomes), but this calculator's advanced-deductions panel currently models 401(k), pre-tax health insurance, and post-tax deductions only — it does not yet include a dependents/Child Tax Credit input. For now, treat the calculator's federal tax estimate as a pre-credit figure if you claim dependents, and expect your actual withholding to run somewhat lower.
How is a bonus paycheck taxed differently from a regular paycheck?
The IRS allows employers to withhold federal tax on bonuses using either the percentage method (a flat 22% federal withholding rate on supplemental wages up to $1 million) or the aggregate method (adding the bonus to your regular wages for that pay period and withholding as if it were all regular pay, which can push more of it into a higher bracket temporarily). This calculator does not currently include a dedicated bonus mode — you can approximate the aggregate method by adding the bonus amount directly to your gross pay for one pay period.
Methodology note: illustrative figures in this guide reflect 2025 U.S. federal tax brackets, the 2025 standard deduction, and 2025 FICA rates/thresholds, which are adjusted for inflation most years. All worked comparisons are hypothetical, rounded, and assume no state income tax and no pre-tax deductions unless stated otherwise — none are exact and none are tax advice. Always verify current-year numbers at irs.gov or with a tax professional before making financial or employment decisions.