Tax Data Sources & Disclaimers
Learn where our paycheck tax information comes from, how the calculator uses those inputs, and why results should be treated as estimates rather than guaranteed paycheck amounts.
Important Information About Estimates
Paychecko is an independent paycheck estimation tool. It is designed to help users understand how federal, state, FICA, and other supported payroll assumptions may affect estimated take-home pay.
Tax withholding can depend on many factors, including filing status, withholding elections, income, pay frequency, deductions, benefits, local taxes, employer payroll practices, and changes in tax rules.
For these reasons, calculator results are estimates only. We do not represent any result as 100% accurate, guaranteed, or a substitute for an employer's payroll calculation, official tax filing, or professional tax advice.
How Tax Data Is Used
Paychecko uses relevant federal and state tax information as inputs for its paycheck calculations. These inputs may include federal withholding guidance, federal tax brackets, FICA thresholds and rates, state income tax rules, standard deductions, and other supported payroll parameters.
Government tax agencies and their publications are important reference sources for these calculations. We review supported tax information and update the calculator when appropriate.
Because tax rules and individual payroll circumstances can change, the information used by an online calculator should always be understood in the context of the assumptions shown by the calculator.
Customize Tax Assumptions
Paychecko provides customization options because a default calculation cannot represent every payroll situation.
Where supported by the calculator, users can adjust federal tax, state tax, FICA-related values, tax brackets, rates, deductions, or other available assumptions.
Customization can be useful for comparing scenarios, testing different tax assumptions, reviewing a potential tax change, or exploring how a different input could affect estimated take-home pay.
Important: A customized value is an assumption supplied by the user. Changing a rate or bracket in the calculator does not mean that the resulting value is the legally applicable rate for your personal tax situation.
Official Federal Tax References
Federal paycheck calculations may use information published by U.S. government agencies. The following resources are important references for federal withholding and payroll tax information.
State Tax Agencies & Government References
State tax information can vary considerably. When reviewing state income tax brackets, deductions, withholding requirements, or related information, users should refer to the applicable state government tax agency.
The following links provide direct access to state tax departments and government tax portals.
A - C
- Alabama: revenue.alabama.gov
- Alaska: revenue.alaska.gov
- Arizona: azdor.gov
- Arkansas: dfa.arkansas.gov
- California: ftb.ca.gov
- Colorado: tax.colorado.gov
- Connecticut: portal.ct.gov/DRS
D - I
- Delaware: revenue.delaware.gov
- District of Columbia: otr.cfo.dc.gov
- Florida: floridarevenue.com
- Georgia: dor.georgia.gov
- Hawaii: tax.hawaii.gov
- Idaho: tax.idaho.gov
- Illinois: tax.illinois.gov
- Indiana: in.gov/dor
- Iowa: revenue.iowa.gov
K - M
- Kansas: ksrevenue.gov
- Kentucky: revenue.ky.gov
- Louisiana: revenue.louisiana.gov
- Maine: maine.gov/revenue
- Maryland: marylandtaxes.gov
- Massachusetts: mass.gov/dor
- Michigan: michigan.gov/taxes
- Minnesota: revenue.state.mn.us
- Mississippi: dor.ms.gov
M - N
- Missouri: dor.mo.gov
- Montana: mtrevenue.gov
- Nebraska: revenue.nebraska.gov
- Nevada: tax.nv.gov
- New Hampshire: revenue.nh.gov
- New Jersey: nj.gov/treasury/taxation
- New Mexico: tax.newmexico.gov
- New York: tax.ny.gov
- North Carolina: ncdor.gov
N - T
- North Dakota: tax.nd.gov
- Ohio: taxation.ohio.gov
- Oklahoma: oklahoma.gov/tax
- Oregon: oregon.gov/dor
- Pennsylvania: revenue.pa.gov
- Rhode Island: tax.ri.gov
- South Carolina: dor.sc.gov
- South Dakota: dor.sd.gov
- Tennessee: tn.gov/revenue
T - W
- Texas: comptroller.texas.gov
- Utah: tax.utah.gov
- Vermont: tax.vermont.gov
- Virginia: tax.virginia.gov
- Washington: dor.wa.gov
- West Virginia: tax.wv.gov
- Wisconsin: revenue.wi.gov
- Wyoming: revenue.wyo.gov
How You Can Verify Tax Information
Tax information can change, and the most appropriate source for a particular question is usually the relevant government tax authority.
If you need to verify a tax rate, deduction, withholding rule, wage limit, or other requirement, use the applicable IRS or state tax agency resource linked on this page.
Your employer's payroll department can also provide information about employer-specific deductions, benefits, withholding elections, and payroll practices that an online calculator may not be able to determine.
What an Online Calculator May Not Capture
Even when tax rates and withholding rules are based on reliable sources, an online calculator may not have access to all of the information used by your employer's payroll system.
- Employer-specific payroll settings
- Individual withholding elections
- Certain benefits and pre-tax deductions
- Local or municipal payroll requirements
- Additional voluntary withholding
- Tax credits or individual circumstances
- Changes to tax rules that have not yet been incorporated into the calculator
Final Disclaimer
Paychecko provides paycheck calculations for informational and planning purposes only. The results are estimates and should not be considered tax, legal, accounting, or financial advice.
Actual withholding, take-home pay, and tax liability may differ based on your personal circumstances, employer payroll practices, deductions, benefits, withholding elections, location, and applicable federal, state, or local rules.
For tax filing, payroll decisions, or other situations where an exact determination is important, consult the applicable government tax agency, your employer's payroll department, or a qualified tax professional.