Paycheck Withholding Calculator

Quick summary

The Paycheck Withholding Calculator models exactly what your employer's payroll system computes — using the same IRS Publication 15-T 2026 percentage method tables (released December 2025, OBBBA-updated).

It applies the $12,900 MFJ / $8,600 single Worksheet 1A annualized adjustment, OBBBA permanent 7-bracket schedule, the four W-4 inputs (Step 2 multiple jobs, Step 3 dependents credit, Step 4a other income, Step 4b deductions, Step 4c extra withholding), pre-tax 401(k) and health insurance deductions, and the full FICA stack (SS 6.2% to $184,500, Medicare 1.45% no cap, +0.9% Additional Medicare over $200K).

Use it to stop giving the government an interest-free loan: if your refund last year was over $2,000, this calc tells you exactly how to update Form W-4 lines 4b or 4c to keep that money in each paycheck instead.

Gross pay (per period)

Pay frequency

Filing status (W-4 Step 1c)

W-4 Step 2 — Multiple jobs / spouse works?

W-4 Step 3 — Dependents credit

W-4 Step 4c — Extra withholding

Pre-tax 401(k) contribution

Pre-tax health/dental

State income tax rate (%)

CA top 13.3% · NY 10.9% · NJ 10.75% · OR 9.9% · TX/FL/NV/SD/TN/WA/AK/WY 0%

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How to use

1 Enter gross pay per period and select frequency (weekly = 52, biweekly = 26, semimonthly = 24, monthly = 12 paychecks/year).
2 Choose filing status (Single, MFJ, HoH). MFS uses Single tables for withholding purposes.
3 Set W-4 inputs: Step 2 (check if you have multiple jobs or spouse works — uses tighter tables), Step 3 dependents credit ($2,000/child + $500/other dep, ANNUAL amount), Step 4a additional income (interest, dividends), Step 4b additional deductions, Step 4c extra per-paycheck withholding.
4 Enter pre-tax deductions per period: 401(k)/403(b)/457, traditional HSA, FSA, pre-tax health/dental insurance. These reduce federal taxable wages but NOT SS/Medicare wages (HSA via cafeteria plan is the exception).
5 Enter your state flat tax rate. For state-by-state brackets use the dedicated state withholding calculator. Click Calculate to see federal withholding, SS, Medicare, Additional Medicare, state, total deductions, and net take-home per period.

2026 IRS Publication 15-T — How Withholding Actually Works

The IRS Pub 15-T percentage method is the algorithm every payroll system runs every pay period.

Step	Calculation	2026 Numbers
1	Annualize period gross pay	Gross × periods/year (52, 26, 24, 12)
2	Subtract Worksheet 1A adjustment	$12,900 MFJ / $8,600 single, HoH, MFS
3	Add W-4 line 4a, subtract 4b	Other income, additional deductions
4	Apply 2026 brackets (Rev. Proc. 2025-32)	10/12/22/24/32/35/37%
5	Subtract dependents credit (W-4 line 3)	$2,000/child + $500/other dependent
6	Divide by periods, add W-4 line 4c	Federal WH per paycheck

2026 FICA Withholding

Tax	Rate	2026 Wage Base / Threshold
Social Security (employee)	6.2%	First $184,500 (max $11,439)
Social Security (employer match)	6.2%	Not on paycheck — employer cost
Medicare (employee)	1.45%	No cap on wages
Additional Medicare	+0.9%	Wages over $200K (employee only)
Supplemental wage rate	22%	Bonuses, commissions (Pub 15-T)

Form W-4 (2020+) — The 5 Steps Explained

Step	What It Does	When to Use
Step 1	Personal info + filing status	Always required
Step 2 (Multiple Jobs)	Check box OR enter from worksheet	Have second job OR spouse works (MFJ)
Step 3 (Dependents)	$2,000/child + $500/other dep credit	Have qualifying children/dependents
Step 4a (Other Income)	Add interest, dividends, side income	Want lump-sum income covered by withholding
Step 4b (Deductions)	Itemized deductions over standard	Large mortgage + SALT + charity
Step 4c (Extra)	Add fixed $X to each paycheck	Need precise refund control

Common Withholding Problems

Multiple jobs without Step 2: Each employer assumes you only earn from them, so each applies the standard deduction → systematic under-withholding. Fix: check Step 2 box on the higher-paying W-4. Big bonus quarter: Your employer applies 22% supplemental rate but your marginal might be 32-37% → owe at filing. Fix: add Step 4c extra withholding for that quarter. Dual-earner MFJ: Both spouses default to MFJ tables assuming one income → severe under-withholding. Fix: use Step 2 worksheet or both check Step 2(c).

FAQ

Q How is federal tax withholding calculated in 2026?

IRS Publication 15-T 2026 percentage method: annualize gross pay, subtract Worksheet 1A adjustment ($12,900 MFJ / $8,600 other), apply W-4 line 4a/4b, run through 2026 OBBBA brackets (10-37%), subtract W-4 line 3 dependents credit, divide by pay periods, add W-4 line 4c extra.

Q How do I update my W-4 for 2026?

Submit a new Form W-4 to your HR/payroll. Steps: (1) personal info, (2) check box if multiple jobs/spouse works, (3) enter dependent credit ($2,000/child + $500/other dep ANNUAL), (4a) other taxable income, (4b) extra deductions, (4c) extra per-paycheck withholding. New W-4 takes effect next pay period.

Q Why is my paycheck so much smaller than my salary?

Federal withholding (10-37%), state withholding (0-13%), Social Security 6.2% (up to $184,500), Medicare 1.45% (no cap), pre-tax 401(k) (5-15% typical), and pre-tax health/dental insurance. Total deductions for high earners can hit 35-45% of gross.

Q What is the Social Security wage base for 2026?

$184,500 — up $8,400 from $176,100 in 2025 (4.8% wage index increase). Once you hit $184,500 in YTD wages, your paycheck stops withholding the 6.2% SS portion for the rest of the year. Maximum employee SS tax: $11,439.

Q How can I increase my paycheck without changing my salary?

Three legal moves: (1) max pre-tax 401(k) ($23,500 in 2026, $31,000 if 50+) — defers tax to retirement, (2) max HSA ($4,300 single / $8,550 family) — never taxed if spent on qualified medical, (3) reduce W-4 over-withholding via Step 4b deductions or removing Step 4c extra.

Q What is Additional Medicare Tax?

0.9% extra Medicare tax on wages over $200,000 (employee-only — employer does NOT match). Threshold is NOT inflation-adjusted (frozen since 2013). For MFJ couples, the household threshold is $250K but each employer withholds based only on $200K — so dual high earners often owe more at filing.

Q Should I claim "exempt" on my W-4?

Only if you (a) had ZERO federal tax liability last year AND (b) expect ZERO this year. Most people fail one or both tests. If you check exempt incorrectly, you'll owe a large underpayment + penalty at April 15. Better: use Step 4b deductions to legally reduce withholding without claiming exempt.

Q Do bonuses get taxed at 22% or my marginal rate?

Withheld at 22% supplemental rate (Pub 15-T) for bonuses up to $1M, 37% above. But ACTUAL tax depends on your marginal rate. Get a $10K bonus, $2,200 withheld at 22%, then at filing your real rate might be 32% — so you owe the difference. Add Step 4c extra withholding to cover.

Official resources

IRS Publication 15-T (2026) — Federal Income Tax Withholding Methods

Internal Revenue Service official publication detailing the 2026 percentage method tables, Worksheet 1A, and W-4 calculation logic.

IRS Form W-4 — Employee Withholding Certificate

Official IRS Form W-4 with Step 2 multiple jobs, Step 3 dependents credit, and Step 4 adjustments.

IRS Tax Withholding Estimator

Internal Revenue Service free interactive estimator for paycheck withholding accuracy and W-4 adjustments.

SSA — 2026 Wage Base & FICA Tax Updates

Social Security Administration 2026 fact sheet announcing the $184,500 SS wage base and 2.8% COLA.

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