Reciprocal Agreements Between Neighboring States

For someone who lives on one side of a state line and works on the other, reciprocity is the difference between one tax return and two. Where an agreement exists it simplifies the position substantially; where it does not, or where the income falls outside it, the full apparatus of non-resident filing and credits applies.

What reciprocity does

Assigns wage taxation to the home state. A resident of one state working in the other is taxed on those wages only where they live.

Redirects withholding. The employer withholds for the employee's home state rather than for the state where the work is performed.

Removes a filing obligation. No non-resident return is required in the work state for the covered wages.

Simplifies the credit position. Since only one state taxes the income, the mechanism in credit for tax paid to another state is not engaged for it.

And exists only where agreed. Between specific pairs of states, not as a general principle.

How it is claimed

By certificate filed with the employer. Declaring residence in the reciprocal state and claiming exemption from withholding in the work state.

Before withholding begins. Otherwise the employer withholds for the work state by default and a refund claim is needed.

Renewed as required. Many states require the certificate annually, and a lapsed one silently reverts the withholding.

Updated on any change. A move that ends residency in the home state ends the entitlement immediately.

And retained by the employer. Who is answerable for withholding correctly and relies on the certificate as its authority.

What falls outside

Anything that is not wages. Business income, rents, gains and self-employment earnings follow the ordinary sourcing rules.

Local and city taxes. Frequently outside the agreement, so a municipal tax can be due on wages the state has agreed not to tax.

Income from a third state. An agreement between two states says nothing about a third, and a commuter with income elsewhere files there normally.

Statutory residency in the work state. Reciprocity addresses sourcing, not residency, and the test in statutory residency and how days are counted can still apply.

And convenience-of-employer situations. Which turn on a different rule entirely, described in the convenience-of-employer rule.

For employers

Know which agreements apply. Between the states where the business operates and the states its employees live in.

Collect and track certificates. Because withholding correctly depends on them and expiry is easy to miss.

Register where withholding is required. An employer withholding for another state generally needs an account there.

Handle remote and hybrid patterns carefully. An employee who now works partly from home may fall outside the arrangement the certificate assumed.

And correct errors promptly. Misdirected withholding creates offsetting refund and liability positions that are simpler to fix within the year than across two.

For employees

Check whether an agreement exists. Before assuming either that one does or that one does not, since neighboring states frequently differ.

File the certificate. It is a short form and it is the only step that actually delivers the benefit.

Watch the local tax position. Which may be unaffected and is a genuine cost in the places that levy one.

Reassess after any change in working pattern. A shift to hybrid working changes where the work is performed and can change everything downstream.

And keep filing where required. Reciprocity removes one return; it does not remove the home state return or any obligation arising from other income.

Reciprocity is the one part of multi-state personal taxation that works simply, and its simplicity is worth appreciating. Two states agreed to give up a claim in exchange for the same concession in return, and the result is that hundreds of thousands of people who cross a line to work each day file a single return and never think about the subject again.

The risk that comes with that simplicity is complacency. An arrangement working silently for years produces employees and employers who have forgotten it depends on a certificate, and payroll systems configured once and never reviewed. A change in residence, in employer, in working pattern or in the agreement itself can break the position without anybody noticing until a notice arrives.

Hybrid working has made this materially more likely. An employee who was a straightforward commuter is now sometimes working at home and sometimes at the office, possibly in a pattern that varies week to week. Where home and office are in the reciprocal states the position generally holds, but the day allocation, the local tax treatment and any statutory residency exposure all need to be looked at again rather than assumed to carry over.

The maintenance required is minimal: confirm the agreement still exists, confirm the certificate is current, confirm the working pattern still matches what the certificate assumes, and check whether any local tax applies. That is a few minutes once a year, and it protects an arrangement that saves considerably more time than it costs to look after.

It is also useful to understand what reciprocity is not, because the term is applied loosely. It is not a general principle that neighboring states cooperate on tax; it is a specific bilateral arrangement covering a specific kind of income. It is not the same as the credit mechanism, which operates everywhere and relieves double taxation after the fact rather than preventing it. And it is not a residency rule: a person covered by an agreement is still resident where they are resident, still subject to any statutory residency test in the other state, and still required to file at home.

The confusion matters most for people who assume that living near a border means their tax position is simplified generally. It is simplified for commuting wages between two agreeing states and for nothing else. A person who lives on one side, works on the other, owns a rental property on the third side of a different line and has a consulting business serving clients in both is running three separate analyses, only one of which reciprocity touches.

Where an agreement does not exist between the relevant pair of states, the position is not unusual or unfavorable — it is simply the ordinary one. A non-resident return in the work state, a resident return at home, and a credit claimed under the rules set out in credit for tax paid to another state. That is the default across most of the country, it works reliably, and it costs one additional return a year — one more form, prepared before the resident return so the credit can be computed, and then the position is closed for that year.