Reciprocity Agreement
An agreement between two states where residents working across state lines only pay income tax to their home state, not the state where they work.
A reciprocity agreement is a compact between two or more states that allows residents who work in a neighboring state to pay income tax only to their state of residence, not to the state where they are physically employed. This simplifies tax filing and prevents double taxation for cross-border commuters.
For example, New Jersey and Pennsylvania have a reciprocity agreement. A New Jersey resident working in Pennsylvania would only pay New Jersey income tax on those wages, not Pennsylvania tax. Without the agreement, they would need to file a Pennsylvania return, pay Pennsylvania tax, and then claim a credit on their New Jersey return for taxes paid to Pennsylvania.
Not all neighboring states have reciprocity agreements, and the specifics vary. Common pairs include Illinois-Iowa, Virginia-Maryland-DC, Ohio-Indiana, and Minnesota-Wisconsin. To take advantage of a reciprocity agreement, you typically need to file a state-specific exemption form (like Pennsylvania's REV-419) with your employer so they withhold tax for your home state instead of the work state.
How it works
A reciprocity agreement is a bilateral compact between two states, not a universal federal rule, so it only exists where both states have specifically agreed to it. Where one is in place, a resident of State A who commutes to work in State B pays income tax only to State A on those wages, and State B simply does not tax the nonresident commuter's earnings at all. Without such an agreement, the default rule applies instead: you owe tax to the state where you physically work, and your home state usually gives you a credit for tax paid to that other state.
You act on a reciprocity agreement by filing a state-specific exemption certificate with your employer — Pennsylvania's REV-419 is the classic example — so the employer withholds for your home state from every paycheck instead of the work state. If you never file that form, your employer defaults to withholding for the work state, and you have to sort out the mismatch yourself when you file, usually by claiming a credit on your home-state return for tax paid to the work state.
Reciprocity only covers state income tax, not local or municipal taxes layered on top — Philadelphia's wage tax, for instance, still applies to nonresident commuters regardless of the Pennsylvania–New Jersey state-level agreement. Not every pair of neighboring states has an agreement (New York and New Jersey notably do not), and remote or hybrid work arrangements can blur which state actually counts as your 'work state' for withholding purposes, which is a common source of under-withholding surprises.
Example: commuting across a reciprocity border
Say you live in New Jersey and take a job earning $70,000 a year in Pennsylvania, a reciprocity pair. Because you filed Pennsylvania's REV-419 exemption certificate with your employer, they withhold New Jersey tax from every paycheck and none for Pennsylvania — you owe New Jersey tax on the full $70,000 and nothing to Pennsylvania.
Now imagine you forgot to file that form, or worked in a state with no reciprocity agreement with New Jersey. Your employer would withhold Pennsylvania tax all year, you would have to file a Pennsylvania nonresident return reporting the $70,000, and then claim a credit on your New Jersey resident return for the Pennsylvania tax paid — extra paperwork that reciprocity is designed to eliminate.
Frequently asked questions
Do I have to file a tax return in the state where I work if there's a reciprocity agreement?
What happens if my state doesn't have a reciprocity agreement with my work state?
Does a reciprocity agreement cover city or local taxes too?
Related Terms
State Income Tax
Income tax levied by individual states, in addition to federal income tax. Rates and structures vary widely — some states have no income tax, while others have rates up to 13.3%.
Withholding
The amount of federal and state income tax your employer deducts from each paycheck and sends to the IRS on your behalf throughout the year.