Income is generally taxed by the state where the work is physically performed, and your state of residence usually taxes it too — with a credit for what you paid the other, so you rarely pay twice. Some neighbouring state pairs have reciprocity agreements that hand the whole thing to your home state instead. Which arrangement applies decides your take-home, and it is decided by the pair, not by preference.
The general rule, and why it is not simple
You generally owe income tax where you work and where you live, with a credit preventing the same income being taxed twice. That sounds tidy and the mechanics differ enough between state pairs to produce real surprises.
Which state gets to tax first, how the credit is calculated, and whether either state has a special rule all vary. Two people commuting across different state lines can face quite different outcomes on identical incomes.
Reciprocity agreements simplify some pairs
Several neighboring states have agreements under which you pay only in your state of residence and your employer withholds accordingly. Where one exists it removes most of the complication and usually a filing obligation with it.
Where none exists, expect to file in both states — a resident return where you live and a non-resident return where you work — and to claim a credit on one of them.
Withholding is where it goes wrong
Your employer withholds based on what it has been told. If that is set up for the wrong state, you can end up with a large bill in one state and a refund owed in another, which is a cash-flow problem even when the total is correct.
Check your first pay stub after any change in work or home location, and check that both states are being handled as you expect. This is the single most common failure and it is entirely preventable.
Which side of the line pays more
Wage data is published by where the establishment sits, so the employer’s state is what the figures describe. General and operations managers run $173,690 in New Jersey against a $105,770 national median; the same occupation in a neighboring state may look very different.
Which means a border region can offer a genuine arbitrage: work on the high-paying side, live on the cheaper one. That is one of the more reliable geographic strategies available, and tax is the thing that decides how much of it survives.
The costs to put against the gain
Commuting time and cost, which is the obvious one. Tolls and transit fares across a border are frequently higher than equivalent distances within one.
Then filing complexity and possibly the cost of having returns prepared. And the risk that a policy change on either side alters the arrangement — border tax rules do change, and they change without regard to your household budget.
Remote work makes this harder, not easier
Working from home in one state for an employer in another raises the question of whether you are working where you sit or where the office is. A few states apply rules that treat you as working at the office regardless.
The pandemic-era temporary rules that softened this have largely lapsed. Anybody who set up an arrangement in 2020 and has not revisited it is operating on assumptions that may no longer hold.
Local taxes are the layer people forget
Several cities levy their own income tax, and some apply it to non-residents who work there. That layer is rarely in state-level comparisons and can outweigh the difference between the two states.
Check the city on both sides, not just the state. It is a five-minute check that occasionally reverses the whole calculation.
Before you commit
Establish which states are involved, whether a reciprocity agreement exists, what your employer will withhold, and whether either city levies its own tax. Four answers, all obtainable before you accept.
This is general information rather than tax advice, and cross-border situations depend heavily on the specific state pair and your own circumstances.
Common questions
Which state taxes me if I commute across a border?
Generally the state where the work is physically performed, with your home state also taxing it and giving a credit for what you paid the other. You rarely pay twice, but you usually pay close to the higher of the two rates.
What is a reciprocity agreement?
An agreement between two specific neighbouring states that a commuter is taxed only by their state of residence. You file a form with your employer and the work state withholds nothing.
What about days I work from home?
Days worked at home are generally worked in your state of residence, and many states expect an allocation by days. A few take the opposite view, which makes some state pairs genuinely contested rather than just complicated.
Do city income taxes apply to commuters?
Generally yes, on work performed within the city. That is a tax no state-level comparison shows and it can be material.
How much can this change my take-home?
Several per cent, which is enough to change whether a cross-border job is worth the commute. All three inputs have documented answers from the revenue departments involved.
Which state taxes me if I commute across a state line?
Generally both — where you work and where you live — with a credit preventing double taxation, unless a reciprocity agreement covers that pair.
What goes wrong most often?
Withholding set up for the wrong state, producing a large bill in one and a refund owed in another. Check the first pay stub after any change.
Does remote work simplify this?
No. Working from home in one state for an employer in another raises whether you work where you sit or where the office is, and pandemic-era easements have largely lapsed.