State Payroll Taxes Explained: Income Tax, SUTA, SDI, and Reciprocity

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Federal payroll taxes are the same no matter where you live. State payroll taxes are not. Two people with identical gross pay working in different states can see completely different deductions on their stub — not because the math is wrong, but because each state sets its own rules for what gets withheld and what doesn't. This is a different question than whether your state legally requires you to receive a pay stub at all; for that, see state pay stub laws. This guide covers what actually gets taxed and withheld at the state level.

Not Every State Has Income Tax Withholding

Several states levy no state income tax, which means employees there have no state withholding line on their stub at all — their paycheck only shows federal withholding and FICA. States that do tax income each set their own rates, brackets, and forms, and many use a state-specific withholding certificate similar in spirit to the federal W-4, though the exact form and rules vary by state. Because of this variation, it's not accurate to describe a single "state tax rate" the way you can describe the 6.2% Social Security rate — you have to check the rules for the specific state.

SUTA: Usually an Employer Cost, Not Yours

SUTA, or State Unemployment Tax Act contributions, fund each state's unemployment insurance program — the benefits paid to workers who lose their jobs. In most states, SUTA is paid entirely by the employer based on payroll size and the employer's claims history, and it doesn't show up as a deduction from your paycheck at all. A small number of states require an employee contribution as well, so if you see a line labeled something like "state unemployment" on your stub, check whether your specific state is one of the exceptions.

SDI: The Deduction You Might Actually See

State Disability Insurance, often abbreviated SDI, is different — it's a deduction some states take directly from employee wages to fund short-term disability benefits or paid family and medical leave programs. Not every state has an SDI program, but where one exists, it typically appears as its own line item separate from income tax withholding, calculated as a percentage of wages up to a state-specific cap. If you've moved from a state without SDI to one with it, this is often the deduction that makes an otherwise-similar paycheck look smaller.

Reciprocity: When You Live in One State and Work in Another

If you live in one state and commute to work in a neighboring state, you might expect to owe income tax withholding to both. In many cases, that's not how it works. A number of state pairs have reciprocity agreements, meaning residents who work across the border only pay income tax withholding to their home state, not the work state, as long as they file the correct exemption certificate with their employer. Without that reciprocity agreement, or without filing the right paperwork, an employer will generally withhold based on the state where the work is physically performed, and you'd reconcile any double taxation when you file your returns — a much bigger hassle than filing the exemption up front.

This is worth double-checking any time you take a job across a state line, since the rule depends entirely on which two specific states are involved.

A Worked Example

Consider an employee earning $2,000 gross biweekly, working in a state with a flat income tax withholding rate and a mandatory SDI program.

• Gross pay: $2,000.00
• Social Security (6.2%): $124.00
• Medicare (1.45%): $29.00
• Federal withholding: $180.00
• State income tax withholding: $70.00
• State SDI contribution: $20.00
• Total deductions: $423.00
• Net pay: $1,577.00

Now compare a coworker earning the same $2,000 biweekly gross, but working in a state with no income tax and no SDI program:

• Gross pay: $2,000.00
• Social Security (6.2%): $124.00
• Medicare (1.45%): $29.00
• Federal withholding: $180.00
• State income tax withholding: $0.00
• State SDI contribution: $0.00
• Total deductions: $333.00
• Net pay: $1,667.00

Same job title, same gross pay, a $90 difference in net pay driven entirely by state rules. Neither employee's FICA changes at all — only the state-level lines do. For the full chain of how gross becomes net once you add every deduction type, see how to calculate net pay.

Checking Your Own State Lines

Your pay stub should clearly separate state income tax withholding from any SDI or state unemployment line, and from your federal and FICA deductions. If a state line looks unfamiliar, the fastest way to identify it is to check your state labor or tax agency's website for the specific program name it corresponds to — SDI programs in particular go by different names and abbreviations from state to state.

The Bottom Line

State payroll taxes aren't a single rule you can learn once and apply everywhere. Some states skip income tax withholding entirely; others add SDI on top of it; SUTA is usually the employer's cost, not yours; and reciprocity agreements can change which state you owe at all if you work across a border. Knowing which of these apply to your specific state is the only way to make sense of the state-level lines on your stub.

Frequently Asked Questions

Related Guides

• State Pay Stub Laws: Which States Require Them
• How Payroll Taxes Work
• How to Calculate Net Pay From Gross Pay

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Authoritative source: U.S. Department of Labor — State Payday Requirements

This guide is informational and not legal or tax advice.