Sources
PaycheckCalc USA uses official and public payroll-related sources as review references and links users to agency resources for exact guidance.
Federal sources
State sources
State links are provided to help users confirm current withholding rules, forms, and agency instructions. PaycheckCalc USA summarizes concepts in original words and does not copy official agency instructions.
- Alabama official tax/revenue source
- Alaska official tax/revenue source
- Arizona official tax/revenue source
- Arkansas official tax/revenue source
- California official tax/revenue source
- Colorado official tax/revenue source
- Connecticut official tax/revenue source
- Delaware official tax/revenue source
- District of Columbia official tax/revenue source
- Florida official tax/revenue source
- Georgia official tax/revenue source
- Hawaii official tax/revenue source
- Idaho official tax/revenue source
- Illinois official tax/revenue source
- Indiana official tax/revenue source
- Iowa official tax/revenue source
- Kansas official tax/revenue source
- Kentucky official tax/revenue source
- Louisiana official tax/revenue source
- Maine official tax/revenue source
- Maryland official tax/revenue source
- Massachusetts official tax/revenue source
- Michigan official tax/revenue source
- Minnesota official tax/revenue source
- Mississippi official tax/revenue source
- Missouri official tax/revenue source
- Montana official tax/revenue source
- Nebraska official tax/revenue source
- Nevada official tax/revenue source
- New Hampshire official tax/revenue source
- New Jersey official tax/revenue source
- New Mexico official tax/revenue source
- New York official tax/revenue source
- North Carolina official tax/revenue source
- North Dakota official tax/revenue source
- Ohio official tax/revenue source
- Oklahoma official tax/revenue source
- Oregon official tax/revenue source
- Pennsylvania official tax/revenue source
- Rhode Island official tax/revenue source
- South Carolina official tax/revenue source
- South Dakota official tax/revenue source
- Tennessee official tax/revenue source
- Texas official tax/revenue source
- Utah official tax/revenue source
- Vermont official tax/revenue source
- Virginia official tax/revenue source
- Washington official tax/revenue source
- West Virginia official tax/revenue source
- Wisconsin official tax/revenue source
- Wyoming official tax/revenue source
Source limitations
Tax agency pages can change. Employers may implement rules differently through payroll systems, and local taxes can depend on work location, residence, employer setup, or special circumstances. Users should confirm exact payroll decisions with official agency instructions or a qualified professional.
How sources are used
Sources are used to review concepts, terminology, federal tax-year assumptions, payroll-tax assumptions, and official agency pathways. PaycheckCalc USA does not copy official tables into every page or claim to be an official agency. Instead, it summarizes paycheck concepts in original language and points users to the agencies that control exact rules.
Source links are especially important for state pages because states can update forms, withholding methods, credits, local rules, or agency URLs. If a user needs exact payroll treatment, the linked state source is the starting point. The calculator estimate is a plain-English planning aid, not the final authority.
How to use the sources page
This sources page gives visitors a starting point for checking official federal and state payroll information. It is not a copy of agency instructions; it is a map to the public sources that control exact rules.
Use the federal links when reviewing broad concepts such as federal withholding, Form W-4, Social Security, and Medicare. Use the state links when checking state withholding forms, local tax notes, or current agency guidance for a specific state.
Because tax agencies can update pages, forms, and instructions, the linked source should be treated as the final reference for exact payroll decisions. PaycheckCalc USA summarizes paycheck concepts in original language and keeps the calculator results clearly labelled as estimates.
Why this sources page matters
The sources page supports trust by explaining how PaycheckCalc USA is organized, reviewed, and limited. Paycheck calculators affect financial planning decisions, so visitors should be able to see where assumptions come from, how estimates are framed, and what the site does when a topic needs clearer explanation.
This page also helps separate educational information from exact payroll instructions. A useful paycheck site should not simply return a number; it should explain the inputs, link to source notes, disclose limitations, and help users decide what to verify next. When a visitor compares salary, hourly work, overtime, bonuses, or state withholding, the supporting trust pages provide context for why the estimate may differ from an employer’s final payroll calculation.
Why this sources page matters
The sources page supports trust by explaining how PaycheckCalc USA is organized, reviewed, and limited. Paycheck calculators affect financial planning decisions, so visitors should be able to see where assumptions come from, how estimates are framed, and what the site does when a topic needs clearer explanation.
This page also helps separate educational information from exact payroll instructions. A useful paycheck site should not simply return a number; it should explain the inputs, link to source notes, disclose limitations, and help users decide what to verify next. When a visitor compares salary, hourly work, overtime, bonuses, or state withholding, the supporting trust pages provide context for why the estimate may differ from an employer’s final payroll calculation.