Last updated: September 2026

State Tax Reciprocity Agreements: What Employers Must Withhold

State tax reciprocity only helps the employee who hands you a signed exemption certificate.

The theory is clean. A work state exempts a nonresident employee from its income tax, and the home state withholds instead. One paycheck, one state, one W-2 line.

The practice is messier, because the agreement only kicks in after the employee files that certificate. Until the form is in your payroll file, you withhold for the work state anyway.

How a reciprocal agreement actually works in payroll

Picture a welder who lives in Camden, New Jersey and drives across the bridge to a shop in Philadelphia. Pennsylvania and New Jersey have a deal that dates back to 1977. Without the deal, the welder owes PA income tax on every hour worked and then claims a credit back home on the NJ-1040. With the deal, Pennsylvania steps aside and New Jersey collects everything.

The employer is the hinge. You run the paycheck. You pick the withholding state. You file the quarterly returns that tell each revenue department who got what.

One state in, one state out.

The mechanics look simple until you remember that reciprocity is opt-in at the employee level. A PA employer hiring a NJ resident does not automatically stop withholding Pennsylvania tax. The worker has to submit Form REV-419 (Employee's Nonwithholding Application) and check the box for New Jersey residence. No form, no exemption. You keep sending money to Harrisburg.

Most payroll software handles this correctly if you configure the employee record with both a residence address and a work location. Gusto, Rippling, and ADP Workforce Now will prompt you for the exemption certificate during onboarding. OnPay will not. Check your provider before you assume the system is smart enough.

The active reciprocity pairs in 2026

Sixteen states and the District of Columbia participate in at least one bilateral arrangement. The list has been stable for a decade, with one big exception. New Jersey tried to pull out of the PA deal in 2016, reversed course after three months of political backlash, and has stayed in ever since.

Here are the agreements currently in force.

Mid-Atlantic cluster

The Mid-Atlantic cluster runs through Pennsylvania and its neighbors. Pennsylvania holds a bilateral agreement with New Jersey that dates to 1977, plus active pairs with Ohio, Virginia, West Virginia, Maryland, and Indiana. Maryland layers on its own deals with Pennsylvania, Virginia, West Virginia, and the District of Columbia. Virginia pairs with Maryland, Washington DC, Pennsylvania, West Virginia, and Kentucky. The District of Columbia is unique in the whole system: it exempts any nonresident worker from DC income tax, not just commuters from Maryland and Virginia.

Midwest cluster

The Midwest cluster is denser. Illinois pairs with Iowa, Kentucky, Michigan, and Wisconsin. Indiana runs agreements with Kentucky, Michigan, Ohio, Pennsylvania, and Wisconsin. Kentucky carries the longest roster in the country, covering seven neighbors: Illinois, Indiana, Michigan, Ohio, Virginia, West Virginia, and Wisconsin.

Michigan has deals with Illinois, Indiana, Kentucky, Minnesota, Ohio, and Wisconsin. Minnesota is narrower, with only Michigan and North Dakota. Ohio pairs with Indiana, Kentucky, Michigan, Pennsylvania, and West Virginia. Wisconsin rounds out the cluster with Illinois, Indiana, Kentucky, and Michigan.

Plains and mountain

The Plains and mountain section is small. North Dakota keeps deals with Minnesota and Montana. Montana reciprocates only with North Dakota. Iowa holds a single pair with Illinois after dropping every other arrangement in the 1990s.

New York is not on the list. Neither is California, Massachusetts, Connecticut, or Oregon. If you employ a New York resident working in New Jersey, both states want a piece and the worker claims a credit for the double taxation. No shortcut exists.

The certificate the employee must file

Every pair uses its own form, and the deadlines differ. Get the wrong version and the exemption does not apply.

In the Mid-Atlantic, Pennsylvania collects Form REV-419 and keeps it with the employer rather than filing it with the state. New Jersey uses Form NJ-165 for PA residents working in NJ. Maryland asks for Form MW507 with the nonresident exemption box checked. Virginia runs on Form VA-4, West Virginia on Form WV/IT-104R, and Washington DC on Form D-4A.

Across the Midwest, Ohio collects Form IT-4NR from residents of the five reciprocal states. Michigan accepts the MI-W4 with line 8 completed. Indiana uses the WH-47 Certificate of Residence, Illinois the IL-W-5-NR, Kentucky the 42A809, and Wisconsin the W-220.

On the northern plains, Minnesota requires Form MWR, North Dakota requires Form NDW-R, and Montana requires the reciprocity section of its MW-4.

Store the signed certificate in the employee's payroll file the same way you store the federal W-4. Several states require you to renew it annually. Minnesota MWR expires every February 28. Montana requires a fresh form at the start of each calendar year. Miss the renewal and you owe the work state retroactive withholding plus penalties.

The tradeoff on chasing renewals is staff time. A shop with twelve cross-border employees is burning two hours every January on paperwork that produces zero revenue. Build it into the onboarding checklist or accept the audit risk.

What happens when there is no agreement

No reciprocity means dual taxation on paper, single taxation in practice, and a confused employee at tax time.

The work state taxes the wages because the income was earned inside its borders. The home state taxes the same wages because resident states tax worldwide income. The worker then claims a credit on the resident return for taxes paid elsewhere, usually on a Schedule equivalent to the out-of-state credit form. The total bill roughly equals the higher of the two rates.

Roughly. Not exactly. Credits are capped at what the home state would have charged on the same income. If the worker lives in a low-tax state and works in a high-tax state, part of the work-state tax is not recoverable.

A New Hampshire resident (no wage tax at all) commuting to Massachusetts eats the full 5% MA rate and gets nothing back. A Texas resident working in Oklahoma? Same story.

That is not true for statutory residents. If the worker spends more than 183 days in a second state with a permanent place of abode there, both states can claim full residency. New York and Connecticut audit this aggressively, especially for remote tech workers who kept a Manhattan pied-a-terre. The reciprocity framework does not protect anyone from a dual-residency finding.

The convenience of the employer rule

Reciprocity and the convenience rule solve different problems and can apply to the same employee. A reciprocal agreement lets a resident of one state claim exemption from the other state’s withholding. A convenience rule runs the other way: it pulls home office days back into the employer’s state regardless of where the work happened. Where both are in play, the certificate governs withholding and the convenience rule governs which days count.

Our guide to the convenience of the employer rule covers which states apply it and how New York’s test works.

The gotcha that wrecks employers every year

Reciprocity is opt-in per employee, not automatic per company.

Reciprocity is not automatic. A reciprocal agreement between two states gives an employee the right to claim exemption from the work state’s income tax withholding, but the exemption takes effect only after that specific employee files the work state’s nonwithholding certificate with the employer. Pennsylvania uses Form REV-419, the Employee’s Nonwithholding Application Certificate. An employer in Pennsylvania with three New Jersey residents already on file has no coverage for a fourth New Jersey hire. Until that fourth employee’s certificate is signed and on file, Pennsylvania withholding is still required.

The exposure sits with the employer. When withholding stops without a certificate on file, the work state can assess the employer for the tax that should have been withheld, plus penalty and interest. Recovering it from the employee afterward is difficult, because the employee has usually already filed a home state resident return reporting no work state liability.

The form creates the exemption. Not the address. Not the assumption. Not the friendly handshake between states.

One more trap worth naming: reciprocity applies to earned income only. W-2 wages, yes. 1099 contractor pay, no. Rental income, investment dividends, and partnership K-1 earnings all follow regular sourcing rules. Retirement income gets a separate and stronger protection from federal law. Under 4 U.S.C. 114, no state may tax the retirement income of a person who is not a resident or domiciliary of that state, so a retiree living in Pennsylvania who draws a pension from a former New Jersey employer owes no New Jersey tax on it. That protection comes from federal law rather than from the reciprocal agreement, and it reaches qualified plans, SEPs, IRAs, 403(b) annuities, section 457 plans, and governmental plans.

Secondary trap: local taxes are separate. The Philadelphia wage tax, the Cleveland RITA system, the Kentucky occupational license fees, the Maryland county piggyback rates. None of these are controlled by state-level reciprocity. A New Jersey resident working in Philadelphia pays no Pennsylvania state tax under REV-419 but still owes the Philadelphia nonresident wage tax. The city sets separate resident and nonresident rates and adjusts them every July 1, so the current rate has to be confirmed with the Philadelphia Department of Revenue before it is configured in payroll. The city is not a party to the state level agreement.

Configuring reciprocity in your payroll system

Every provider handles this differently. Here is what to check before you run your first cross-border paycheck.

Gusto asks for residence state and work state during employee setup and prompts for the exemption certificate automatically. It will not let you save the profile until you confirm whether reciprocity applies. For pairs it does not recognize (the 2023 NJ convenience rule, for example), you have to override manually.

ADP Workforce Now requires you to mark the employee as a nonresident in the state tax setup and upload the certificate to the document vault. It does not enforce renewal dates. Set a calendar reminder.

Rippling handles the 16 standard pairs cleanly and flags renewals 30 days before expiration. Cost is higher but the automation pays off if you run more than ten cross-border workers. Compare the top payroll providers for multi-state employers before you commit.

Paychex Flex requires a support ticket to enable reciprocity withholding on most pairs. Plan for a 48-hour turnaround.

Reciprocity handling varies by platform and this site holds no capture establishing a ranking. If you are running reciprocity through OnPay or Patriot, verify every paycheck manually for the first quarter. The limitation of doing it yourself is obvious: you become the quality control department.

Your action steps this week

Audit every employee whose residence address and work location cross a state border. Pull the list from your HRIS or, if you do not have one, from your W-4 files.

For each one, confirm three things: whether an agreement exists between the two states, whether the employee has filed the correct exemption certificate, and whether the certificate needs renewal this year. If any answer is no or unknown, fix it before the next payroll run.

Next, map your remote workers against the convenience of the employer rule. Anyone working from NY, CT, DE, NE, PA, or NJ for an out-of-state employer needs a separate review. Reciprocity will not save them.

Pull the current agreement list directly from the Pennsylvania Department of Revenue or your own state's revenue site. Bookmark it. These agreements can be terminated with 120 days notice and you do not want to learn about a change from a penalty notice.

Finally, if you are running cross-border payroll on the wrong platform, switch. A proper multi-state payroll setup pays for itself the first time an auditor walks in. Review the payroll tax fundamentals and the full multi-state withholding rules while you are at it.

Get the forms signed. Get the system configured. Get the quarterly returns right the first time.

This is not legal or financial advice. Consult a qualified professional for your specific situation.