Methodology & source ledger

Transparent math, bounded claims.

Explain My Paycheck uses deterministic formulas and versioned 2026 federal all 50 state rules, and the District of Columbia. When a rule is not verified, the calculator says so instead of filling the gap with a guess.

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Implemented

Federal income tax

2026 brackets, standard deductions, common W-4 adjustments, and credits.

Implemented

All 50 states and DC

Official 2026 withholding methods, verified zero-tax outcomes, certificate inputs, rounding rules, and supported employee payroll contributions.

Verified zero tax

Texas & Florida

No individual state income tax, confirmed using official state sources.

Decision tools

Compare & solve

Two-job comparisons, live what-if cards, and an iterative gross-raise solver.

Maryland live · broader coverage pending

Local & multi-state

Maryland resident county withholding is implemented. Other local formulas, resident credits, and cross-state wage allocation remain excluded.

Calculation flow

From earnings to one explainable paycheck

  1. 01

    Build gross pay

    Convert salary or hourly work into one pay period, then add entered overtime, bonuses, commissions, tips, and other earnings.

  2. 02

    Classify deductions

    Apply each benefit to the right wage base. Traditional 401(k), Roth 401(k), and qualified cafeteria-plan benefits are not interchangeable.

  3. 03

    Estimate federal tax

    Annualize federal taxable wages, apply W-4 adjustments, the standard deduction, tax brackets, credits, and extra withholding.

  4. 04

    Estimate federal payroll tax

    Apply employee Social Security and Medicare rules to FICA-taxable wages, including the annual wage base and additional Medicare threshold.

  5. 05

    Estimate state withholding

    Apply the work state's verified method when home and work states match, including supported state payroll contributions.

  6. 06

    Explain take-home

    Subtract included taxes and deductions from gross pay and expose the assumptions, warnings, and source behind each major line.

  7. 07

    Reuse the result for decisions

    Comparison, what-if, and reverse-raise tools rerun this same calculation. They do not use separate shortcuts or AI-generated tax estimates.

  8. 08

    Report local coverage separately

    Resolve local withholding through its own typed layer. Missing locations and unsupported jurisdictions stay distinct from a verified zero-tax result.

Official source ledger

Rules implemented in this release

Each record identifies the rule set, its purpose, and the date it was last verified.

Income taxVerified 2026-08-13

IRS Revenue Procedure 2025-32

2026 standard deductions, federal tax brackets, and inflation-adjusted tax amounts.

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Payroll taxVerified 2026-08-13

IRS Publication 15 (2026)

Employee Social Security and Medicare rates, thresholds, and wage-base guidance.

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W-4Verified 2026-08-13

2026 Form W-4

Dependent credits, other income, deductions, and additional per-paycheck withholding inputs.

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BenefitsVerified 2026-08-13

IRS retirement contribution withholding FAQ

Federal income-tax and FICA treatment for traditional and designated Roth contributions.

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Contribution limitsVerified 2026-08-13

IRS 2026 retirement plan limits

The standard 2026 elective-deferral limit used for contribution warnings.

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BenefitsVerified 2026-08-13

IRS Publication 15-B (2026)

Tax treatment for qualified cafeteria-plan health benefits and the 2026 health FSA limit.

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Contribution limitsVerified 2026-08-13

IRS Revenue Procedure 2025-19

2026 HSA contribution limits for self-only and family coverage.

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State withholdingVerified 2026-08-13

California 2026 Withholding Schedules — Method B

Exact-calculation tables, low-income exemptions, deductions, allowances, credits, and state PIT rates.

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Payroll taxVerified 2026-08-13

California 2026 contribution and withholding rates

The 1.3% employee State Disability Insurance rate and removal of the wage cap.

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BenefitsVerified 2026-08-14

California EDD Types of Payments

California PIT and SDI wage treatment for HSA contributions, including contributions made through an IRC Section 125 cafeteria plan.

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State withholdingVerified 2026-08-13

New York Publication NYS-50-T-NYS (1/26)

2026 New York State deduction, allowance, exact-calculation, and top-income withholding methods.

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Local withholdingVerified 2026-08-17

New York Publication NYS-50-T-NYC (1/26)

2026 New York City resident exact-calculation method and combined deduction and exemption allowance tables. Transcription reproduces all four worked examples on page 27 exactly.

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Local withholdingVerified 2026-08-17

New York Publication NYS-50-T-Y (1/26)

2026 Yonkers resident surcharge at 16.75% of New York State withholding, and the nonresident earnings tax at 0.50% after the published exemption. Transcription reproduces the three worked examples on page 24 exactly.

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State withholdingVerified 2026-08-13

Illinois 2026 IL-700-T withholding tables

The 4.95% withholding rate and the 2026 IL-W-4 exemption values used by the percentage method.

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State withholdingVerified 2026-08-13

Pennsylvania employer withholding guidance

The 3.07% flat withholding rate for Pennsylvania taxable employee compensation.

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Payroll taxVerified 2026-08-13

Pennsylvania 2026 unemployment employee contribution

The 0.07% employee contribution applied to gross covered wages without the employer wage-base cap.

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State withholdingVerified 2026-08-13

Massachusetts Circular M (2026)

The 5% percentage method, exemption factors, filing-status reductions, and 9% surtax withholding above the 2026 threshold.

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Payroll taxVerified 2026-08-13

Massachusetts 2026 PFML contribution rates

The maximum 0.46% employee PFML share and Social Security wage-base cap used in the estimate.

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State withholdingVerified 2026-08-13

North Carolina NC-30 (2026)

The 4.09% percentage method, standard deductions, allowance value, and whole-dollar paycheck rounding rule.

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State withholdingVerified 2026-08-14

Colorado DR 1098 (2026)

The 4.40% wage-withholding formula and default annual adjustments based on federal W-4 filing status.

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State withholdingVerified 2026-08-14

Michigan 2026 Income Tax Withholding Guide

The 4.25% direct percentage computation and $5,900 personal and dependency exemption amount.

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State withholdingVerified 2026-08-14

Virginia Employer Withholding Instructions

The exact formula effective after July 1, 2025 and applicable in 2026, including standard deductions, VA-4 exemptions, and progressive rates.

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State withholdingVerified 2026-08-14

Wisconsin Publication W-166 (January 2026)

The authorized alternate withholding method, deduction phaseouts, WT-4 exemptions, and progressive rate schedule.

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State withholdingVerified 2026-08-14

2026 Arizona Form A-4

The employee-elected percentages from 0.5% through 3.5%, the zero-withholding election, and the 2.0% employer default.

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State withholdingVerified 2026-08-14

Georgia 2026 Employer's Tax Guide

The 4.99% percentage method, filing-status standard deductions, and $5,000 dependent allowance.

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State withholdingVerified 2026-08-14

Indiana Departmental Notice #1 (2026)

The 2.95% state rate and WH-4 annual exemption values for personal, dependent, and adopted-child exemptions.

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Local withholdingVerified 2026-08-18

Indiana Departmental Notice #1 (R46 / 01-26)

2026 county income tax rates for all 92 Indiana counties, and the January 1 residence-then-principal-work rule that selects which county applies.

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Local withholdingVerified 2026-08-18

City of Wilmington city wage tax

1.25% Wilmington earned income tax on residents' income wherever earned and on nonresidents' income earned within the city. Wilmington is Delaware's only municipality levying a wage tax.

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Local withholdingVerified 2026-08-18

Kansas City, Missouri earnings tax

1% earnings tax on residents and on nonresidents for work performed within Kansas City.

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Local withholdingVerified 2026-08-18

City of St. Louis earnings tax

1% earnings tax on residents regardless of employer location and on nonresidents working in the city. The separate 0.5% payroll expense tax is employer-paid and excluded from withholding.

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Local withholdingVerified 2026-08-18

Denver Tax Guide Topic No. 61, Occupational Privilege Taxes

Employee occupational privilege tax of $5.75 per month for employees earning at least $500 in a month for services performed in Denver. The $4.00 business OPT is employer-paid and excluded from withholding.

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Local withholdingVerified 2026-08-18

Michigan Form 5469 (Rev. 05-25), 2026 City of Detroit Income Tax Withholding Guide

Detroit resident rate of 2.4% and nonresident rate of 1.2%, with exemptions valued at $600 per year. Detroit is the only Michigan city administered by the Department of Treasury; the other 23 self-administer and are not implemented.

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Local withholdingVerified 2026-08-18

Pennsylvania DCED Official Tax Register, reporting year 2026

Act 32 earned income tax rates and local services tax amounts for all 2,619 Pennsylvania municipality and school district combinations, keyed by PSD code. Withholding is the higher of the resident rate and the work municipality's nonresident rate.

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State withholdingVerified 2026-08-18

District of Columbia 2026 individual income tax rate schedule (D-40ES booklet)

The seven-bracket DC rate schedule for 2026, from 4% to 10.75%, printed on page 9 of the official 2026 D-40ES estimated tax booklet. DC publishes one schedule for every filing status. Applies to residents only; Congress bars the District from taxing nonresident income.

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State withholdingVerified 2026-08-18

OTR Tax Notice 2022-08, District of Columbia Withholding

OTR's standing withholding guidance. The District stopped publishing withholding tables after the 2018 FR-230 because the Tax Cuts and Jobs Act suspended personal exemptions, and directs employers to use the DC rate schedule together with the federal allowance amount instead.

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State withholdingVerified 2026-08-18

IRS Publication 15-T, Federal Income Tax Withholding Methods, for use in 2026

Supplies the $4,300 federal allowance amount that OTR Tax Notice 2022-08 directs DC employers to use, at line 1k of the annual percentage method worksheet for employees without a 2020-or-later Form W-4.

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Local withholdingVerified 2026-08-18

Ohio Municipal Income Tax Rate Database, effective January 2026

Rates for all 678 Ohio municipalities levying an income tax for 2026, from the Department of Taxation's Finder rate database. Withholding follows the work location under ORC 718.03. The resident credit is set by each municipality's own ordinance and is not included.

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Local withholdingVerified 2026-08-18

Ohio JEDD/JEDZ Income Tax Rate Database, effective January 2026

Rates for all 150 Ohio joint economic development districts and zones levying an income tax for 2026. A JEDD taxes work performed inside it the way a municipality does, so it is withheld on the same work-location basis.

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Local withholdingVerified 2026-08-18

Ohio school district income tax levies, effective January 2026

All 214 Ohio school districts levying an income tax for 2026, including which 68 tax earned income only rather than the traditional base. Residence-based, unlike Ohio municipal income tax, which is withheld where the work is performed and is published separately.

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State withholdingVerified 2026-08-14

Minnesota 2026 Withholding Tax Instructions

The $5,300 W-4MN allowance value and the official single and married computer-formula schedules.

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Payroll taxVerified 2026-08-14

Minnesota 2026 Paid Leave premiums

The 0.88% total premium, maximum 0.44% employee share, and Social Security wage-base limit.

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State withholdingVerified 2026-08-14

Iowa 2026 Individual Income Tax Withholding Formula

The 3.8% rate, filing-status deductions, annual IA W-4 allowance amount, and per-pay-period formula effective January 1, 2026.

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State withholdingVerified 2026-08-14

Kentucky 2026 Withholding Tax Computer Formula

The $3,360 standard deduction and 3.5% withholding rate for wages paid in 2026.

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State withholdingVerified 2026-08-14

Ohio Employer Withholding Optional Computer Formula

The $650 exemption value and three-rate computer formula effective October 1, 2025 and current for 2026 withholding.

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State withholdingVerified 2026-08-14

Washington Department of Revenue income-tax forms guidance

Washington does not impose an individual income tax, so state income-tax withholding is zero.

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Payroll taxVerified 2026-08-14

Washington 2026 Paid Leave employer guidance

The 1.13% total premium, maximum 71.43% employee share, tips exclusion, Social Security wage cap, and paycheck rounding method.

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Payroll taxVerified 2026-08-14

WA Cares employer premium guidance

The 0.58% employee premium on gross wages excluding tips, without a Social Security cap, and the approved-exemption process.

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State withholdingVerified 2026-08-15

Alabama Withholding Tax Tables and Instructions (January 2026)

The computer formula, income-dependent standard deductions, federal-withholding deduction, Form A-4 exemptions, dependent amounts, and progressive rates.

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State withholdingVerified 2026-08-15

Louisiana R-1210 Withholding Tax Formula Method (2026)

The 3.09% formula and L-4 standard deductions of $12,875 or $25,750 effective January 1, 2026.

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State withholdingVerified 2026-08-15

Missouri Employer's Tax Guide (2026)

Filing-status standard deductions, the progressive percentage formula through 4.7%, and required whole-dollar paycheck rounding.

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State withholdingVerified 2026-08-15

Utah Publication 14 Withholding Schedules (2026)

Pay-period schedules using the 4.45% gross calculation, 1.3% allowance phaseout, federal W-4 filing category, and official examples.

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State withholdingVerified 2026-08-15

Idaho Percentage Computation Table (revised July 2026)

The revised 5.3% pay-period formula, zero child-tax-credit allowance value, filing-status thresholds, and whole-dollar rounding rule.

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State withholdingVerified 2026-08-15

Nebraska Circular EN (2026)

The pay-period allowance values and percentage-method schedules effective for wages paid on or after January 1, 2026.

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State withholdingVerified 2026-08-15

Oklahoma OW-2 Withholding Tables (2026)

The $1,000 annual allowance value, single and married pay-period schedules, and required whole-dollar rounding.

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State withholdingVerified 2026-08-15

South Carolina WH-1603F Withholding Formula (2026)

The allowance, standard-deduction, progressive-rate, and per-pay-period calculation effective January 1, 2026.

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State withholdingVerified 2026-08-16

State of Alaska financial disclosure

Alaska has no individual income tax, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-16

Nevada Tax Notes (March 2026)

Nevada does not impose an individual income tax, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-16

South Dakota Department of Revenue tax guidance

South Dakota does not impose a state income tax, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-16

Wyoming Legislative Service Office tax-capacity brief

Wyoming has no personal income tax, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-13

Texas Constitution, Article VIII, Section 24-a

Texas prohibits an individual net income tax, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-13

Florida Department of Revenue personal income-tax FAQ

Florida does not impose a personal income tax, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-16

Arkansas Withholding Tax Formula Method (2026)

The $2,470 standard deduction, midpoint lookup, progressive formula, high-income adjustment, $29 exemption credits, and official computer-formula example.

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State withholdingVerified 2026-08-16

Delaware Employer's Guide — approved annualized-wage method

The current standard deductions, progressive computation table through 6.6%, $110 exemption credit, and official withholding example.

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State withholdingVerified 2026-08-16

Rhode Island Employer's Income Tax Withholding Tables (2026)

Pay-period exemption amounts and phaseout thresholds, percentage schedules through 5.99%, and the official weekly example.

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State withholdingVerified 2026-08-16

West Virginia IT-100.2A Percentage Method (March 2026)

The 2026 exemption amounts, percentage schedules for the default two-earner and optional one-earner elections, and required whole-dollar paycheck rounding.

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State withholdingVerified 2026-08-16

Kansas KW-100 Withholding Tax Guide

The current K-4 allowance values, single and married percentage schedules, official semi-monthly example, and permitted whole-dollar rounding used for 2026 wages.

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State withholdingVerified 2026-08-16

Maine Withholding Tables for Individual Income Tax (August 2026)

The revised 2026 allowance value, filing-status deductions and phaseouts, percentage schedules, million-dollar surcharge, whole-dollar rounding, and official examples.

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State withholdingVerified 2026-08-16

Mississippi Computer Payroll Accounting Flowchart (2026)

The Form 89-350 exemption amount, filing-status standard deductions, zero-rate band, 4% formula, spouse-employment election, and whole-dollar paycheck rounding.

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State withholdingVerified 2026-08-16

New Mexico State Wage Withholding Percentage Tables

The single, married, and head-of-household percentage schedules effective January 1, 2025 and still current for 2026, plus the $2.25 quarterly employee workers' compensation fee.

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State withholdingVerified 2026-08-16

Montana Employer and Information Agent Guide (2026)

The MW-4 filing categories, pay-period percentage formulas through 5.65%, whole-dollar rounding, and official examples effective January 1, 2026.

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State withholdingVerified 2026-08-16

North Dakota Income Tax Withholding Rates and Instructions (2026)

The annual percentage method for current Forms W-4, filing-status schedules through 2.5%, and required paycheck rounding.

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State withholdingVerified 2026-08-16

New Hampshire Department of Revenue Administration tax guidance

New Hampshire does not tax reported W-2 wages, and its former Interest and Dividends Tax was repealed for periods after December 31, 2024.

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State withholdingVerified 2026-08-16

Tennessee Department of Revenue individual income-tax guidance

Tennessee has no individual income tax on wages, so employee state income-tax withholding is zero.

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State withholdingVerified 2026-08-16

Connecticut Employer's Tax Guide and TPG-211 (2026)

The CT-W4 withholding codes, personal exemptions and credits, initial tax schedules, 2% phase-out add-back, tax recapture, and annual calculation rules effective January 1, 2026.

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State withholdingVerified 2026-08-16

Hawaii Booklet A (2026)

The annualized withholding method, $1,144 regular allowance, $4,350 extra allowance, filing-category schedules, and official worked example for wages paid in 2026.

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State withholdingVerified 2026-08-16

New Jersey Income Tax Withholding Rate Tables

The NJ-W4 Rate A and Rate B percentage schedules and pay-frequency-specific allowance values currently applicable to 2026 wages.

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State withholdingVerified 2026-08-16

Vermont Income Tax Withholding Instructions, Tables, and Charts (2026)

The pay-frequency percentage tables, filing-category schedules, and $5,400 annual W-4VT allowance effective January 1, 2026.

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State withholdingVerified 2026-08-16

Maryland Employer Withholding Percentage Method (2026)

The $3,400 standard deduction, $3,200 MW507 exemption value, 4.75% withholding floor, filing-category schedules, and $5,000 gross-wage threshold.

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State withholdingVerified 2026-08-16

Maryland Withholding Tax Facts (2026)

All 23 county and Baltimore City resident local rates, including the income-based Anne Arundel and Frederick County rate selections.

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State withholdingVerified 2026-08-16

Oregon Withholding Tax Formulas (2026)

The 2026 standard deductions, $263 allowance credit, federal-withholding subtraction and phaseout, filing-category formulas, and rates through 9.9%.

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Payroll taxVerified 2026-08-16

Paid Leave Oregon 2026 contributions

The 1% total contribution rate, maximum 60% employee share, and $184,500 employee wage base for 2026.

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Payroll taxVerified 2026-08-16

Oregon Statewide Transit Tax

The employee Statewide Transit Tax rate of one-tenth of one percent that remains in effect for 2026.

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Important limits

An estimate, not a payroll replacement.

Results can differ from an employer's payroll because year-to-date wages, employer-specific rounding, imputed income, special plan eligibility, catch-up contribution rules, and less-common tax situations are not fully modeled. Supplemental earnings are combined with regular wages in the estimate. Local withholding is calculated in Colorado, Delaware, Indiana, Maryland, Michigan, Missouri, New York, Ohio, and Pennsylvania, each from the locality selected in Advanced options. Local taxes in the remaining states are not calculated, resident credits between overlapping jurisdictions are left to the annual return, and a paycheck whose home and work states differ falls outside both the state and local methods. This tool provides general information, not tax advice.