Salary & Tax Calculator Methodology
Last updated: May 29, 2026Tax year: 2026
NetPayTools provides free salary and tax calculators for all 50 US states and Washington DC. This page explains exactly how each calculation works, what assumptions we make, and where our data comes from. Our goal is full transparency so you can trust the numbers.
Core Calculation Flow
Every salary calculation follows the same five-step process:
- Start with gross annual salary. The calculator accepts any annual gross salary or hourly wage (which is annualized based on 2,080 working hours per year).
- Subtract pre-tax deductions. Optional deductions such as 401(k) contributions, HSA/FSA deposits, and health insurance premiums are subtracted from gross pay before taxes are computed, reducing taxable income.
- Apply the standard deduction. For 2026, the federal standard deduction for single filers is $14,600. Married filing jointly receives $29,200. Head of household receives $21,900. Our calculators use the standard deduction by default — itemized deductions are not supported.
- Compute federal income tax. Using the 2026IRS progressive tax brackets (10%, 12%, 22%, 24%, 32%, 35%, 37%), we apply the marginal rate to each portion of taxable income within each bracket.
- Compute state income tax and FICA. State tax is calculated using each state's specific brackets and rates. FICA includes Social Security (6.2% on wages up to $176,100 for 2026) and Medicare (1.45% on all wages, plus an additional 0.9% on earnings over $200,000 for single filers).
Key Assumptions
- Filing status defaults to Single. Users can change to Married Filing Jointly, Married Filing Separately, or Head of Household. Each status uses its own standard deduction and bracket thresholds.
- No itemized deductions. All calculations use the standard deduction. We do not model mortgage interest, charitable contributions, medical expenses, or other itemized deductions.
- No tax credits. Credits such as the Child Tax Credit, Earned Income Tax Credit, or education credits are not included. The result reflects gross tax liability before credits.
- Pre-tax deductions are user-supplied. Users enter 401(k), HSA, FSA, or insurance amounts manually. We subtract them from gross pay before computing tax.
- State taxes assume residency. Calculations assume the user lives and works in the selected state. Non-resident, partial-year, and multi-state scenarios are not modeled.
- Rounding. All monetary values are rounded to the nearest dollar. Percentages (effective tax rate) are rounded to two decimal places.
Federal Income Tax Brackets (2026)
The calculator applies the official IRS progressive bracket structure for 2026. The brackets are adjusted annually for inflation.
| Rate | Single Filers | Married Filing Jointly | Head of Household |
|---|---|---|---|
| 10% | $0 – $11,925 | $0 – $23,850 | $0 – $17,000 |
| 12% | $11,926 – $48,475 | $23,851 – $96,950 | $17,001 – $65,000 |
| 22% | $48,476 – $103,350 | $96,951 – $206,700 | $65,001 – $103,350 |
| 24% | $103,351 – $197,300 | $206,701 – $394,600 | $103,351 – $197,300 |
| 32% | $197,301 – $250,525 | $394,601 – $501,050 | $197,301 – $250,525 |
| 35% | $250,526 – $626,350 | $501,051 – $751,600 | $250,526 – $626,350 |
| 37% | Over $626,350 | Over $751,600 | Over $626,350 |
FICA (Social Security & Medicare) — 2026
- Social Security: 6.2% on wages up to $176,100. Wages above this cap are not subject to Social Security tax.
- Medicare: 1.45% on all wages, with no wage cap.
- Additional Medicare Tax: 0.9% on earnings over $200,000 (single), $250,000 (married filing jointly), or $125,000 (married filing separately).
- These rates represent the employee portion only. Employer matches are not displayed in take-home pay calculations.
State Income Tax
Each state page applies that state's specific tax brackets, rates, standard deductions, and personal exemptions. We support:
- Nine states with no income tax (AK, FL, NV, NH, SD, TN, TX, WA, WY)
- Flat-rate states (CO, IL, IN, KY, MA, MI, NC, OH, PA, RI, UT, AZ, GA, ID)
- Progressive-rate states (all others with brackets up to 13.3% in CA)
State-specific standard deductions, personal exemptions, and credits (such as retirement income exclusions) are applied where applicable. County and city local taxes are not included by default.
Data Sources
- Federal tax brackets: IRS Revenue Procedure 2025-05 (for 2026 inflation adjustments). irs.gov/pub/irs-drop/rp-25-05.pdf
- FICA rates and wage base: Social Security Administration. ssa.gov/OACT/ProgData/taxRates.html
- State tax brackets and rules: Each state's official Department of Revenue or taxation agency. Links are provided in the source citations on each state page.
- Cost of living indices: Missouri Economic Research and Information Center (MERIC) Cost of Living Index, Council for Community and Economic Research (C2ER), and U.S. Bureau of Labor Statistics. bls.gov
Editorial Review Process
All tax data and calculation logic is reviewed by our payroll research team at the start of each tax year and whenever tax law changes are published by the IRS or state revenue agencies.
- Annual review: Every January, all federal and state tax brackets, standard deductions, and FICA thresholds are updated to reflect the new tax year.
- Quarterly checks: State-level tax law changes (rate changes, new deductions, phase-out adjustments) are monitored and applied within 30 days of enactment.
- Reviewer: All calculations are reviewed by NetPayTools editorial team, a licensed tax professional with 12+ years of experience in multi-state payroll compliance.
- Feedback: If you identify an error or outdated data point, please contact us so we can investigate and correct it.
Limitations
NetPayTools results are estimates intended for informational and planning purposes only. They should not be used as the sole basis for tax filing, payroll withholding, or financial decisions. We recommend consulting a qualified CPA or tax attorney for advice specific to your situation.
- Itemized deductions are not supported
- Tax credits (Child Tax Credit, EITC, education credits) are not included
- Local/city taxes are not included (except where noted on state pages)
- Self-employment tax is not modeled
- Capital gains and investment income tax are not calculated
Change Log
- May 29, 2026: Updated for 2026 tax year. New FICA wage base ($176,100). Standard deduction adjustments applied.
- January 15, 2025: Initial methodology page published.