How to Run Multi-State Payroll with Conflicting Tax Rules

When an employee works in more than one state, payroll generally has to follow the work, not the home address or the headquarters. Start from where each day's work was physically done, then apply any reciprocity agreement between the employee's home and work states, but only once the employee's exemption certificate is on file. Daily work-state records are what make the result defensible.

This guide is for payroll managers and HR teams handling traveling staff, hybrid commuters and remote employees who sometimes work from another state.

Key takeaways

• Wages are generally sourced to the state where the work is performed, so one employee can create withholding duties in several states in a single week.
• Reciprocity agreements let some cross-border commuters have tax withheld only for their home state, but each agreement covers specific states and only wages.
• Reciprocity is applied through a certificate the employee gives you, such as Pennsylvania's REV-419EX, Ohio's IT 4NR or Illinois's IL-W-5-NR.
• New York treats telecommuting days of a nonresident whose primary office is in New York as New York workdays unless the employer has set up a bona fide office at the remote location.
• Track the work state per day, not just per employee profile, and keep the records for at least four years.

Why is multi-state withholding so common now?

Take a sales rep who lives in southern New Jersey. Monday and Tuesday she's at client meetings in Manhattan. Wednesday she works from home. Thursday and Friday she's on site at a customer near Philadelphia. By Friday afternoon her employer has wages connected to three states, and a payroll profile that lists only her home address won't get that right.

That pattern used to be limited to traveling salespeople and regional managers. Now it includes hybrid employees who live in one state and commute to an office in another, field technicians who cross state lines for jobs, and remote staff who spend a week working from a family member's home or a vacation property. Border metro areas such as New York and New Jersey, Philadelphia and southern New Jersey, the Washington, DC region and the Kansas City area have large numbers of people crossing state lines for work every day.

If you have a meaningful remote or hybrid population, you need a written policy and a payroll setup that handles this on purpose. Our HR guide to remote and hybrid team problems covers the policy side of where people work.

Which state gets the withholding?

The starting point is the state where the services are performed. States with an income tax generally tax nonresidents on wages earned for work done inside their borders, regardless of where the employee lives or where the employer is based.

In practice, when an employee works in several states, the employer may need to:

1. Register as a withholding agent in each state where employees work.
2. Withhold the right amount for each state using that state's rules and tables.
3. Deposit and file with each state on that state's schedule.
4. Report each state's wages and withholding on the employee's Form W-2 at year end.

Federal income tax withholding isn't affected by any of this. It's one federal calculation. State withholding is handled state by state, and rates, tables, thresholds and reciprocity rules differ. Federal unemployment and state unemployment follow their own rules too; our explainer on employer-only payroll taxes such as FUTA and SUTA covers that separate question.

How do reciprocity agreements change the rules?

Some neighboring states have agreements under which residents of one state who work in the other pay income tax on their wages only to their home state. The employee gives the employer a certificate, and the employer withholds for the home state instead of the work state. A few verified examples:

Agreement	Who it covers	Certificate the employee files
New Jersey and Pennsylvania	Residents of either state working in the other, for compensation such as salaries, wages, tips, fees, commissions and bonuses	NJ residents working in PA: Form REV-419EX. PA residents working in NJ: Form NJ-165
Ohio	Residents of Indiana, Kentucky, Michigan, Pennsylvania and West Virginia working in Ohio	Form IT 4NR, kept on file by the Ohio employer
Illinois	Residents of Iowa, Kentucky, Michigan and Wisconsin working in Illinois, for wages, salaries, tips and commissions	Form IL-W-5-NR

Other states have their own agreements, so check the revenue department for each state where your people live and work. Three details trip teams up:

• The certificate comes first. Ohio's form says employers are required to have a copy on file for each employee claiming the exemption. Until you have it, don't apply reciprocity.
• Moves must be reported. Ohio's IT 4NR tells employees to notify their employer within 10 days if they move to another state.
• Only wages are covered. New Jersey notes that its agreement with Pennsylvania doesn't apply to self-employment income or other income taxable in both states, and Illinois says its agreements don't apply to other Illinois income.

If tax was withheld for the work state anyway, the employee usually has to file a return in that state to get it back, which is a good reason to collect certificates during onboarding rather than after the first paycheck.

What about New York?

New York is a frequent source of problems because of how it treats remote work. According to the New York State Department of Taxation and Finance, if a nonresident's primary office is in New York, their telecommuting days are considered days worked in the state unless the employer has established a bona fide office at the telecommuting location. Without that office, the employee generally still owes New York tax on income from telecommuting.

So a New Jersey resident assigned to a Manhattan office who works from home on Fridays may still have New York-source income for those Fridays. The reciprocity agreement between New Jersey and Pennsylvania doesn't help here, because New York isn't part of it. Confirm how New York's rules apply to your specific arrangements with a tax adviser.

How does it work for one employee in one week?

Go back to the sales rep. She lives in New Jersey, her employer is based in New York City, and her weekly salary is $3,000, or $600 a day across five workdays.

• Monday and Tuesday in New York: $1,200 in New York wages
• Wednesday at home in New Jersey: $600 in New Jersey wages
• Thursday and Friday in Pennsylvania: $1,200 in Pennsylvania wages

If she has filed Form REV-419EX, the employer doesn't withhold Pennsylvania tax on the Pennsylvania days, and those wages are treated as New Jersey wages for withholding. New York has no such agreement with New Jersey, so the employer withholds New York State tax on the New York-source wages. How New Jersey withholding is handled on top of that, including any credit for tax paid to New York, depends on current state rules and your payroll provider's setup, so have your tax adviser confirm it.

Notice what the employer needed to get this right: the work state for each day. A weekly estimate ("mostly New York") wouldn't hold up.

What records do you need to keep?

If a state questions your withholding, you'll need to show where each employee worked. At a minimum, keep:

• The employee's name, each workday's date, and the state where work was performed that day
• Hours or pay allocated to each state
• Every reciprocity certificate, with the date received and any updates after a move
• Records of state registrations and filings

The IRS says to keep all employment tax records for at least four years after filing the fourth quarter for the year. States set their own retention rules, so check each state you register in and use the longest period that applies.

How should you configure your payroll system?

Most enterprise HR and payroll platforms support employees with more than one work state. The setup steps that matter most:

1. Capture work state at the daily timesheet level, not only on the employee profile.
2. Route withholding from that field so the calculation uses the right state's rules for each day's pay.
3. Register in each state before the first paycheck that includes wages sourced there.
4. Track reciprocity certificates in the system, with a review date and a prompt when an employee's address changes.
5. Test year-end output. Each state with sourced wages should show up correctly on the W-2. Our payroll year-end W-2 readiness checklist is a useful dry run.

Also confirm how your system handles state deposits. Each state sets its own schedule, which works differently from the federal rules in our guide to payroll tax deposit schedules.

What are the most common multi-state withholding errors?

• Withholding only for the home state. Payroll treats the employee as a resident and ignores days worked elsewhere.
• Applying reciprocity without a certificate. This leaves the employer exposed for the work state's withholding.
• Allocating by estimate. Weekly or monthly guesses instead of daily records are hard to defend.
• Not registering in work states. Occasional work in a state can still create a registration requirement there.
• Missing address changes. An employee who moves can lose eligibility for a reciprocity exemption, and nobody updates the withholding.

FAQ

Do I have to withhold for a state if an employee only works there a few days?

Often yes. Wages are generally sourced to the state where the work is done, and short stays can still count. Whether a state offers any day or dollar threshold before withholding starts varies by state and changes over time. Check each state's withholding guidance before assuming short trips don't count, and record the work state for every day so you can apply whichever rule applies.

What happens if an employee doesn't submit a reciprocity form?

Without the certificate on file, don't apply reciprocity. Withhold for the work state as usual. Ohio, for example, says employers are required to keep the IT 4NR on file for each employee claiming the exemption. If tax was already withheld for the work state, the employee generally files a return in that state to recover it.

Does reciprocity cover bonuses and commissions?

It depends on the agreement. New Jersey's agreement with Pennsylvania defines compensation to include salaries, wages, tips, fees, commissions and bonuses. Illinois's agreements cover wages, salaries, tips and commissions. Neither covers self-employment or other income taxable in both states, so read the specific agreement before applying it to unusual pay types.

What to do next

• Pull a list of employees who worked in more than one state in the last quarter, using timesheets or travel records.
• Collect and log reciprocity certificates for every eligible cross-border employee, and add the form to onboarding.
• Add a daily work-state field to timesheets and test that payroll reads it.
• Publish a policy requiring employees to notify HR before working from a different state, even for a day, and review it with your tax adviser.

This article is general information, not tax or legal advice. State rules change, so confirm details with each state's revenue department or a qualified adviser.

Sources

• Reciprocal Personal Income Tax Agreement Between New Jersey and Pennsylvania, New Jersey Division of Taxation
• Form IT 4NR: Employee's Statement of Residency in a Reciprocity State, Ohio Department of Taxation
• Pub-119, Illinois Schedule NR for Individuals, Illinois Department of Revenue
• Nonresidents and part-year residents FAQs, New York State Department of Taxation and Finance
• Employment tax recordkeeping, Internal Revenue Service

Last reviewed: October 2026.