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Compare today’s paycheck estimate with a what-if: new salary, new filing status, or both — and see the per-check and annual take-home delta.
Last updated 3 October 2026
Estimates only — not tax, payroll, or financial advice. This is a simplified educational calculator (2026-ish federal brackets + standard deduction, employee FICA, optional flat state tax). It is not IRS Publication 15-T withholding, a substitute for your W-4, or a tax return. Real paystubs vary with credits, benefits, local taxes, additional Medicare tax, and your employer’s payroll system. Confirm numbers with a qualified tax or payroll professional.
A $6,000 raise on a $60,000 salary adds $230.77 to each biweekly gross and $185.42 to the deposit. You keep $4,821 of the $6,000 — 80.35% of it — and the 19.65% that goes is not the 22% people expect. It is 12% federal, because that is the bracket this income sits in, plus 7.65% of Social Security and Medicare, which have no bracket at all.
That is one of five changes that move a paycheck mid-year. Each is set out below with its arithmetic and the rule behind it, because they fail in different ways, and three of them happen without anybody filing a form.
$60,000 to $66,000, biweekly, single filer, nothing deferred, no state tax.
Gross per paycheck goes from $2,307.69 to $2,538.46. Estimated deposit goes from $1,938.08 to $2,123.50. Annually: estimated federal tax rises $720, which is 12% of $6,000; Social Security and Medicare rise $459, which is 7.65% of $6,000; and estimated take-home rises $4,821. Those three add back to $6,000 exactly, which is the useful check on any raise arithmetic.
The 22% figure that circulates is the supplemental rate, which applies to bonuses and similar payments, not to a permanent increase in salary. A raise is ordinary wages and is withheld on like ordinary wages.
Same $60,000, single to married filing jointly.
Two things move together. The 2026 standard deduction goes from $16,100 to $32,200, and every bracket threshold doubles: the 12% band starts at $12,400 of taxable income for a single filer and at $24,800 for a joint one, the 22% band at $50,400 and $100,800, the 24% band at $105,700 and $211,400. Estimated annual federal tax falls from $5,020 to $2,840, a drop of $2,180, and the deposit rises $83.84 a paycheck.
Social Security and Medicare do not change at all, and will not: on $60,000 they are $4,590 a year either way. Filing status is Step 1(c) of the Form W-4 and is invisible to FICA.
One caution this page cannot encode. A joint return is one return covering two incomes, and a withholding calculation run on one of them alone will understate the tax if the other is substantial. That is precisely what the Step 2 checkbox on the W-4 exists for, and the W-4 withholding estimator is the page that asks.
$190,000, biweekly, no change to salary or status at all.
Publication 15 for 2026 sets the base: “The rate of social security tax on taxable wages is 6.2% each for the employer and employee. The social security wage base limit is $184,500.” Nobody files anything, nothing is elected, and the paycheck changes anyway. Twenty-five paychecks carry $453.08 of Social Security. The twenty-sixth carries $112.08, because only $1,807.69 of it is still under the base. That one fortnight is $341.00 larger than the others, and in January it reverts.
At $240,000 the effect is much bigger and lands much earlier: $572.31 through paycheck 19, $565.15 on paycheck 20, and $0.00 from paycheck 21 to the end of the year.
The comparison above cannot show you any of this, because it reports the first paycheck of the year on both sides. Across a wage-base crossing the two sides are right about January and silent about November.
$240,000, biweekly, again with nothing elected.
IRS Topic no. 560 puts the employer's duty at the point where “wages or railroad retirement (RRTA) compensation paid to an employee for the year exceeds $200,000”, and that trigger does not vary with filing status. The Additional Medicare Tax is 0.9%. On $240,000 paid biweekly it begins at paycheck 22, at $27.69, and grows to $83.08 by paycheck 26 as a larger share of each fortnight sits above the line. Medicare on that last paycheck is $216.92 rather than the $133.85 it was in January.
Your own threshold is a different number from your employer's: $250,000 married filing jointly, $125,000 married filing separately, $200,000 for everyone else, and it is settled on the return. So two spouses on $150,000 each have nothing withheld and owe 0.9% on $50,000 when they file, while a single filer on $240,000 has it withheld and may have been withheld slightly too much or too little depending on the year's shape. A status change from single to married filing jointly does not stop your employer withholding it.
This is the limitation worth understanding before you act on any figure above. The comparison runs two complete years, one at the old salary and one at the new. A real raise lands on a date.
Take the Case 1 raise effective at paycheck 14 of 26. Thirteen paychecks at $2,307.69 and thirteen at $2,538.46 is $63,000 of gross for the year, not $60,000 and not $66,000. Run $63,000 through the same engine and the estimated deposit is $2,030.79 a paycheck with $52,800.50 for the year. Neither side of the comparison above shows that. The left-hand side describes the year you are leaving and the right-hand side describes the first full year you will have, and the year the raise happens in is between them.
That matters for withholding specifically, because the default method has no memory. Pub 15-T Worksheet 1A begins by taking “the employee's total taxable wages this payroll period” and instructing the payroll system to “Multiply the amount on line 1a by the number on line 1b” — the pay periods in a year. From paycheck 14 onward, your employer is withholding as though $66,000 had been your salary since January. It never looks back at the thirteen paychecks that were smaller.
Pub 15-T section 6 sets out alternatives, and two of them exist precisely for a year whose pay is uneven. Neither is automatic.
Cumulative wages. “An employee may ask you, in writing, to withhold tax on cumulative wages. If you agree to do so, and you've paid the employee for the same kind of payroll period (weekly, biweekly, etc.) since the beginning of the year, you may figure the tax as follows. Add the wages you've paid the employee for the current calendar year to the current payroll period amount. Divide this amount by the number of payroll periods so far this year, including the current period. Figure the withholding on this amount, and multiply the withholding by the number of payroll periods so far this year, including the current period. Subtract the total tax already deducted and withheld during the calendar year from the total amount of tax calculated.” Note both conditions: the request must be in writing, and the employer may agree rather than must.
Part-year employment. For someone who started partway through the year, “A part-year employee who figures income tax on a calendar-year basis may ask you to withhold tax by the part-year employment method. The request must be in writing, must be under penalties of perjury”, and must state the last day of any prior employment that year, that the employee uses a calendar-year accounting period, and that they reasonably expect no more than 245 days of employment in total during the year. This is the method that stops a September start date being withheld as though it were a full year's salary.
A new Form W-4 is not instant, and the deadline is the employer's, not yours. Publication 15, section 9: “If an employee gives you a Form W-4 that replaces an existing Form W-4, begin withholding no later than the start of the first payroll period ending on or after the 30th day from the date when you received the replacement Form W-4.” Earlier is allowed; later is not. The same section adds a trap worth reading twice: “A Form W-4 that makes a change for the next calendar year won't take effect in the current calendar year.” A December form intended for January does nothing to December. And “don't adjust withholding for pay periods before the effective date of the new form” — there is no retroactive correction in payroll. Correcting the year happens on the return.
The IRS's own guidance on its Tax Withholding Estimator is specific and short. “Check your withholding every January to make sure it's correct for the year.” Beyond that, “You should also check your withholding when you have a major life change, including: New job or other paid work; Major income change; Marriage, divorce, or separation; Child birth or adoption; Home purchase”. And one that catches people: “If you change your withholding during the year, you may need to update it again in late December to withhold the right amount next year.” A mid-year adjustment sized to rescue the current year will be wrong for the next one.
Part of the PaystubKit tools collection. Calculations run locally in your browser. Estimates only, not tax advice.
On $60,000 going to $66,000, biweekly as a single filer, the estimate keeps $4,821 of the $6,000 — 80.35%. Gross per paycheck rises $230.77 and the deposit rises $185.42. The 19.65% withheld is 12% federal, the bracket that income sits in, plus 7.65% of Social Security and Medicare.
No. 22% is the flat supplemental withholding rate, which applies to bonuses and similar payments. A permanent salary increase is ordinary wages and is withheld on at your bracket, which on $66,000 of single-filer income is 12% federal plus 7.65% FICA.
On $60,000 it cuts estimated annual federal tax from $5,020 to $2,840, a drop of $2,180, and raises the deposit $83.84 a paycheck. The 2026 standard deduction goes from $16,100 to $32,200 and every bracket threshold doubles. Social Security and Medicare are unchanged at $4,590 a year.
Publication 15 requires the employer to begin withholding no later than the start of the first payroll period ending on or after the 30th day from the date they received the form. Nothing is adjusted retroactively, and a form that makes a change for next calendar year does not affect this one.
Only if you ask in writing. Pub 15-T's cumulative-wages method averages what you have been paid so far this year, and the employer may agree to it rather than must. The part-year employment method, for someone who started partway through the year, needs a written request under penalties of perjury plus a statement that you expect no more than 245 days of employment that year.
Because both sides are complete years. A raise effective at paycheck 14 of 26 gives $63,000 of gross for the year, which estimates at $2,030.79 a paycheck and $52,800.50 for the year — a figure that appears on neither side of the comparison.
No. Estimates only — not tax, payroll, or financial advice. These are annual-liability sketches divided by your pay periods, not IRS Pub 15-T withholding, and they use no Form W-4 Step 3 or Step 4 entries.