Federal and state income taxes can appear beside each other on a pay stub, but they are separate systems. They use different taxable-wage definitions, forms, brackets, deductions, credits, and filing rules. Some locations also collect city, county, disability, or paid-leave amounts.
Federal income-tax withholding
Employers use federal taxable wages, pay frequency, Form W-4, and IRS methods. Progressive brackets mean only income inside each band uses that rate. Federal withholding is reconciled with final liability on the federal return.
State income-tax withholding
A state may use progressive brackets, a flat rate, or no broad tax on wage income. State deductions, exemptions, credits, and withholding certificates often differ from federal rules. A federal W-4 does not replace every state form.
Work state versus resident state
Remote work, cross-border commuting, and moving can create obligations in more than one state. Reciprocity agreements may allow resident-state withholding, while resident credits can limit double taxation. The exact treatment is state-specific.
Local taxes and payroll programs
Cities and counties may levy income, occupational, or school-district taxes. States can also collect disability insurance or paid-leave premiums. These are why a calculator modeling only federal and state income tax may not exactly reproduce a pay stub.
States without broad wage income tax
A state without broad individual wage income tax can still have federal tax, FICA, unemployment-related rules, paid-leave premiums, sales tax, or property tax. “No state income tax” does not mean no taxes or deductions.
How to verify the result
Separate federal, FICA, state, local, and benefit lines. Confirm the work and resident states recorded by payroll. Use the relevant revenue department as the authority, especially after moving or starting remote work.
Worked paycheck example
A resident of one state working in another may see work-state withholding. A reciprocity agreement might instead permit resident-state withholding after the employee submits the proper certificate. Without reciprocity, a nonresident return and a resident credit may be needed. A one-state calculator cannot decide this without both locations.
Common mistakes to avoid
- Assuming a no-income-tax state has no payroll deductions
- Using the top bracket as an effective rate
- Ignoring city or county tax
- Selecting only the home state when work-state rules apply
- Assuming federal deductions work identically for state tax
Frequently asked questions
Can two states tax the same wages?
Filing can be required in both, but reciprocity or resident credits may reduce double taxation.
Is FICA a state tax?
No. Social Security and Medicare are federal payroll taxes.
Sources, review, and next step
This educational guide prioritizes primary government references and is reviewed for consistency with our calculators. It is not individualized tax, payroll, accounting, or legal advice.
Use the related paycheck calculator · All payroll guides · Editorial policy · Methodology