1099 Contractor in North Carolina with a Idaho Client: Where Do You File?
Answer
The client's location does not decide this. Self-employment income from personal services is sourced to where the work happens, so working from North Carolina keeps it North Carolina-source and North Carolina-taxed. Travel to Idaho to work and that portion becomes Idaho-source, needing a Idaho nonresident return.
Last verified
The client's location is the wrong thing to track. What matters is where you were sitting when you did the work — which is why a contractor's exposure to Idaho is measured in days on the ground rather than in invoices sent.
Idaho publishes no de minimis day count or dollar floor for nonresidents. Any Idaho-source wage income above the state's general filing threshold requires a nonresident return, and that threshold is reset each year — check the current figure on the Idaho State Tax Commission nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · North Carolina
Make quarterly estimated payments to North Carolina Department of Revenue on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · IdahoForm 43
File a Idaho nonresident return only if you performed services inside Idaho. Idaho publishes no de minimis day count or dollar floor for nonresidents. Any Idaho-source wage income above the state's general filing threshold requires a nonresident return, and that threshold is reset each year — check the current figure on the Idaho State Tax Commission nonresident instructions before filing.
- 3Resident return · North CarolinaForm D-400TC
File the North Carolina resident return last and claim the credit for any tax paid to Idaho.
The two states, side by side
| North Carolina | Idaho | |
|---|---|---|
| Taxes wages | Yes — flat | Yes — flat |
| Reciprocity partners | None | None |
| Convenience rule | No | No |
| Nonresident return | Form D-400 with Schedule PN | Form 43 |
| Credit for other-state tax | Form D-400TC | Form 39NR |
| Nonresident safe harbour | None published | None published |
| Local income tax | No | No |
| Revenue department | North Carolina Department of Revenue | Idaho State Tax Commission |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Idaho and working in North Carolina gives:Home state, plus the client state if you work there.
Same two states, different situation
The withholding answer turns on how you are paid and where the work happens, not only on which two states are involved.
- W-2 commuter: North Carolina → IdahoBoth states — credit offsets the double tax
- Remote worker: North Carolina → IdahoHome state only
- Moved mid-year: North Carolina → IdahoTwo part-year returns
Other North Carolina pairs
Questions people actually ask
I live in North Carolina and my client is in Idaho. Do I have to file a Idaho tax return?
The client's location does not decide this. Self-employment income from personal services is sourced to where the work happens, so working from North Carolina keeps it North Carolina-source and North Carolina-taxed. Travel to Idaho to work and that portion becomes Idaho-source, needing a Idaho nonresident return.
Do reciprocity agreements help a 1099 contractor?
No. Every state reciprocity agreement in the country is an arrangement about wage withholding between two revenue departments, and a 1099 has no withholding to switch off. Whether North Carolina and Idaho hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The North Carolina and Idaho rules on this page were last checked against North Carolina Department of Revenue and Idaho State Tax Commission on 2026-08-07. We re-check the full grid every December after state legislative sessions close, and re-check the convenience-of-the-employer states quarterly because that is where the rules move fastest.
Sources
Every fact above comes from the revenue department that publishes the rule. We do not cite secondary summaries, and we do not restate a figure we could not find at source.
- North Carolina Department of Revenue — individual income taxaccessed 2026-08-07
- Idaho State Tax Commission — individual income taxaccessed 2026-08-07