State Tax Reciprocity Agreements: An Employer Guide

The first time this lands on a small employer, it does not arrive as a tax question. It arrives as a person. Somebody you want to hire lives twenty minutes away on the wrong side of a state line, and the offer is written before anybody thinks about which state gets the withholding.

Left alone, the default is unkind to that person. The state where the work happens taxes the wages at source because the work happened there. The state where they live taxes the wages because that is what states do to their residents. The money comes back eventually through a credit on the resident return, but eventually is not a payroll cycle, and in the meantime the employee can be short.

A reciprocity agreement is the fix, and it is narrower and more procedural than most people expect. It covers a specific pair of states, it covers wages and nothing else, and it does not apply until your employee has handed you a form. This guide covers which state pairs qualify, the certificate that switches the exemption on, and what you still owe the work state.

I build the people and records tooling for businesses without an HR department at FirstHR, and FirstHR is an onboarding and HR platform rather than a payroll provider. This is general information about US employer obligations, not tax advice.

What a State Tax Reciprocity Agreement Is

A state income tax reciprocity agreement is a bilateral arrangement between two states under which a resident of one who earns wages in the other is taxed on those wages only by the state where they live. For you, the employer, it changes exactly one thing: you withhold for the home state instead of the work state.

Three limits are built into that definition and each one catches people out. The agreement binds two named states and does not travel: an agreement between Ohio and Kentucky says nothing about an employee commuting between Ohio and Indiana, even though Ohio and Indiana happen to have an agreement of their own with different terms.

It applies to compensation for personal services and not to other income. Wisconsin’s revenue department states the point plainly, noting that reciprocity covers salaries, wages, commissions and fees but not gains on the sale of property, rental income or lottery winnings (Wisconsin Department of Revenue). An employee with a rental unit in the work state files there whatever their commute looks like.

And it is a creature of state law, which means it can be amended or ended. Wisconsin and Minnesota ended theirs, and the two states have had no agreement since January 1, 2010 (Wisconsin Department of Revenue). Whatever list you are reading, including this one, is a starting point and not an authority.

The Problem It Solves

Without an agreement, a cross-border commuter is taxed at source by the work state and again by the home state, and gets the overlap back later through a credit rather than avoiding it in the first place. Reciprocity removes the first of those two claims so the overlap never happens.

The default position explains why employers who have never dealt with this find the outcome surprising. States tax nonresidents on income sourced to the state, and wages are sourced to where the work is physically performed. States also tax residents on all income from all sources. Both claims are valid at the same time on the same dollar.

The home state then gives a credit for tax paid to the other state, so the employee is not taxed twice in the final reckoning. Where the employer withholds for both states, though, tax comes out twice until a refund arrives the following spring. On a modest salary in two states with meaningfully different rates, that is real money sitting in the wrong treasury for a year.

Some home states stop the double withholding at source. Pennsylvania’s employer guide requires no Pennsylvania withholding from a resident working entirely in another state when the employer is withholding that state’s income tax (Pennsylvania Department of Revenue). The employee still files a nonresident return in the work state and a resident return at home, which is the paperwork reciprocity removes.

There is a second beneficiary and it is you. Applying reciprocity correctly usually means one state income tax registration for that employee instead of two, one set of withholding deposits, one reconciliation, one year-end filing. That is a genuine simplification for a small employer, and it is the reason the agreements are worth understanding rather than delegating entirely.

Which States Have Agreements

Fifteen states and the District of Columbia participate in at least one reciprocity agreement, covering roughly thirty state pairs, and the whole system sits in a band running from the Mid-Atlantic through the Midwest into the northern plains. Every pair in the table below was checked against the revenue department of the state named in the first column.

One entry deserves a note. The District of Columbia is in the list because Maryland and Virginia name it as a partner, but its position is different in kind: the District does not tax the wages of nonresidents at all (D.C. Code § 1-206.02), which produces the same result as reciprocity without being an agreement with any particular state.

Published counts of participating jurisdictions differ between sources, and the reason is largely how the District is classified.

The absences matter more than the presences for most employers. New York, California, Massachusetts, Connecticut, Georgia, Colorado and the great majority of income tax states have no agreement with anyone. If you are hiring across one of those borders, the two-state answer described in multi-state payroll processing is your answer, and there is no shortcut.

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The Certificate of Non-Residence Is Not Automatic

Reciprocity never applies by itself. It is an exemption the employee claims by filing the work state’s certificate of non-residence with you, and until that document is in your file you are required to withhold for the work state exactly as though no agreement existed.

Pennsylvania states the requirement in its employer withholding guide in the plainest possible terms. No withholding of Pennsylvania personal income tax is required for a nonresident employee from a reciprocal state, provided the employee files an Employee’s Nonwithholding Application Certificate (REV-419) with the Pennsylvania employer (Pennsylvania Department of Revenue). Provided is the operative word. No certificate, no exemption.

Notice the variation in that last column, because it is where the administrative work actually lives. Some states want the form once and held by you. North Dakota wants it every year by February 28, then mailed on to the state by March 31 (North Dakota Office of State Tax Commissioner).

Michigan sits at the other end of the range. Treasury publishes no non-residency certificate at all, so the employer builds a form or takes a signed letter carrying the employee’s name, legal address, and Social Security number (Michigan Department of Treasury). There is no common standard here and no shared deadline.

The practical rule I would give any small employer is to treat the certificate as a hiring document rather than a tax document. It belongs in the same pass as the federal withholding form and the state equivalent, collected before the first payroll rather than chased afterwards, and stored where the rest of the payroll records live.

What Reciprocity Does Not Cover

A reciprocity agreement exempts a nonresident from one tax in one state. It does not release you from registering in the work state, from paying unemployment contributions there, or from any of the non-tax obligations that come with having somebody work in a state.

The unemployment point is the expensive one. State unemployment tax is assigned by localization of work rules, which decide which state a job belongs to and have nothing to do with income tax agreements, and it lands in the state where the services are performed (U.S. Department of Labor).

An employer who reads the reciprocity agreement, concludes the work state has no claim, and never opens an unemployment account there has a liability building quietly from the first payroll.

The local tax point is the most common and the least expensive. New Jersey’s tax division states that the agreement with Pennsylvania covers compensation only (New Jersey Division of Taxation), and no state agreement reaches a Pennsylvania municipality. Philadelphia collects its wage tax from nonresidents who work in the city whatever their home state (City of Philadelphia).

Kentucky and Ohio run the same pattern one level down. Ohio municipal income taxes and Kentucky occupational license fees sit outside the state agreements entirely. If the work location has a city tax, treat it as a separate question with a separate answer, and check it before the first payroll rather than after the city writes.

Remote Workers and the Vanishing Commute

When an employee works entirely from home, reciprocity usually stops applying, because there is no longer a work state on the other side of a border. The state where they sit is both the home state and the work state, and you withhold for it because that is where the work happens rather than because of any agreement.

This is a genuinely counterintuitive result for employers who set the arrangement up as a commuter case. The certificate on file was answering the question of which of two states gets the wages. Once the commute disappears there is only one state in the question, and the form is dormant paperwork rather than a live exemption.

The consequence is usually a registration rather than a change in the employee’s tax bill. If your office is in the work state and your employee has stopped coming to it, your obligation moves to their state entirely. You register there for income tax withholding, open an unemployment account there, extend workers’ compensation coverage there, and follow their state’s wage and hour rules.

Whenever somebody in your records changes address or work pattern, re-examine the withholding setup rather than assuming it still holds. Reciprocity certificates name a state of residence, and Illinois requires the employee to notify the employer within ten days of moving and file a fresh certificate (Illinois Department of Revenue). Almost nobody does it unprompted.

The States With No Income Tax

Nine states do not tax wage income, and none of them has or needs a reciprocity agreement, because there is no work state tax to be exempted from in the first place.

Direction matters here, and it gets reversed constantly. If your employee lives in a taxing state and commutes into one of these nine, they still owe their home state on those wages, and the absence of a work state tax does nothing about that. Depending on the home state, you may be expected to register and withhold there, or the employee may have to make estimated payments themselves.

The reverse case is the awkward one. If your employee lives in one of these nine and commutes into a taxing state, the work state taxes them as a nonresident and there is no reciprocity to prevent it. A Texas resident working across a border pays that state and has no home state return in which to claim a credit for it.

None of this makes the nine states free of payroll registration. Washington runs paid family and medical leave alongside a long-term care program, several of them have their own unemployment quirks, and every one of them has an unemployment account waiting for you. No income tax is one line removed from a longer list, as the state by state payroll tax picture makes clear.

Rules That Cut the Other Way

A small number of states run a sourcing rule that does the opposite of reciprocity. Instead of releasing the work state’s claim on a commuter, a convenience of the employer rule extends the employer state’s claim to a nonresident who is working outside it.

The test asks why the remote arrangement exists. If the employee works from another state because the employer genuinely needed them to, the wages are generally sourced where the work happened. If they work from another state for their own convenience, the employer’s state treats the wages as earned there and taxes them.

New York is the state that matters most in practice. It set out its position on applying the test to telecommuters in a 2006 technical memorandum and has enforced it strictly since (New York State Department of Taxation and Finance).

Connecticut’s Office of Legislative Research counts at least seven states applying the rule: Alabama, Connecticut, Delaware, Nebraska, New Jersey, New York, and Pennsylvania (Connecticut General Assembly). That is more states than most employers expect, and the list moves.

Two of those seven work differently from the rest. Connecticut and New Jersey apply a reciprocal version that bites only where the employee’s home state runs a convenience rule of its own. Published lists differ at the edges because the rules differ in scope, so check the employer state’s own guidance rather than count entries in somebody’s table.

Pennsylvania is the interesting overlap, because it appears on both lists. It has six reciprocity agreements and a convenience rule, and for residents of its six partner states the reciprocity agreement is the governing answer. The convenience rule reaches the employees who are not covered by an agreement, which in practice means the remote worker in a state Pennsylvania has no arrangement with.

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If your business is not based in one of those states, this section is background. If it is, it is the most consequential thing on this page, because it can require you to withhold for your own state on wages earned entirely somewhere else, and the employee is the one who feels it.

What the Employer Actually Has to Do

Applying a reciprocity agreement comes down to three decisions: whether to register in each state, which state’s rate to apply, and what evidence you keep. Everything else is administration around those three.

The rate question has a short answer that surprises people: you apply the home state’s rate, brackets and withholding form, not a blend and not the work state’s. That is the whole point of the agreement, and it means the home state withholding certificate is the document your payroll calculation runs from.

Year-End Reporting

Where reciprocity has been applied for the full year, the W-2 should show only the home state in the state boxes: the home state and your account number in box 15, the wages in box 16 and the tax withheld in box 17 (IRS General Instructions for Forms W-2 and W-3), with nothing for the work state.

The messy version is the mid-year switch, which is common because certificates arrive late. If you withheld work state tax in February and home state tax from April, the form carries two state lines, and the employee has to file a nonresident return in the work state to recover the first block. That is recoverable and irritating, and it is the strongest argument for collecting the certificate during onboarding.

The reconciliation itself is not special. It runs with the rest of your year-end payroll checklist, and the only extra step is checking that the state boxes name the state you expected before the forms go out rather than after somebody queries them.

One more thing to check at the same time: the state filings. Reciprocity does not remove the work state’s unemployment filings while the work happens there, and it does not remove the home state filing at all. Two states, two sets of year-end obligations, one of which happens to have no income tax attached.

Where Small Employers Get This Wrong

Almost every reciprocity problem I have seen is one of four things, and none of them is a difficult tax question.

The first is assuming the agreement applies because the two states have one. It does not, until the certificate is filed, and the gap between those two moments is where the exposure sits. The second is treating reciprocity as a reason not to register in the work state at all, which quietly builds an unemployment liability while the income tax position is perfectly correct.

The third is forgetting that cities are not parties to state agreements, which produces an underpaid municipal account that nobody notices until the city writes. The fourth is leaving the setup untouched when the commute ends, so a certificate for a work state the employee has not visited in two years continues to sit in the file as though it were doing something.

What worked for me

The change that fixed this for me was moving the certificate out of the payroll process and into onboarding, next to the eligibility and withholding forms, so it gets collected by the same person on the same day as everything else. Chasing a tax form after the first payroll has run is a different job from collecting it with the rest of the paperwork, and it is a job that never gets prioritized. I also put a single line in our records for each cross-border person naming the home state and the work state, because every question in this area turns out to be answerable from those two facts and neither of them was previously written down anywhere.

Nick Anisimov, FirstHR founder

That single line per person is the register below. One row for every employee whose home state and work state differ, carrying the date you checked both revenue departments, the date the certificate arrived, and the accounts you actually opened in each state, with a second tab for the certificates that have to be renewed.

This page covers one narrow mechanism on purpose, because it is the one that gets assumed rather than checked. The next step is small: for every person who lives in one state and works in another, write down both states and, where the two have an agreement, collect the work state certificate before their first payroll.

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