State reciprocity agreements.
In plain English
A state reciprocity agreement is a deal between two states that lets you pay income tax only to your home state, even if you commute across the state line for work. Without one, the state where you work would normally withhold its tax, and you would file in both states and sort out the credit. With a reciprocity agreement, you file a form with your employer so the work state stops withholding its income tax. Only certain pairs of states have these agreements, mostly clustered around shared borders.
01Why it matters
If you cross a state line for work and your two states have an agreement, filing one form can stop the wrong state from taking tax out of every paycheck and save you from filing a second return.
02The math, step by step
Suppose you live in one state and drive across the border to work in a neighboring state that has a reciprocity agreement with yours. You give your employer the reciprocity exemption form. Now the work state withholds no income tax, and you report and pay all of it to your home state instead. Check both states' revenue departments to confirm an agreement exists and to get the right form.
03What this is NOT
Reciprocity is not the same as the out-of-state credit. Reciprocity stops the other state from taxing you in the first place. The credit applies when there is no agreement, so you still pay both states and then claim a credit to avoid double tax.
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