1099 Contractor in Utah with a Connecticut 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 Utah keeps it Utah-source and Utah-taxed. Travel to Connecticut to work and that portion becomes Connecticut-source, needing a Connecticut nonresident return.
Last verified
Reciprocity agreements are the first thing contractors ask about and the first thing that does not apply to them. Every agreement in the country is a wage-withholding arrangement, and a 1099 has no withholding to switch off.
Connecticut publishes no de minimis day count or dollar floor for nonresidents. Any Connecticut-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 Connecticut Department of Revenue Services nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · Utah
Make quarterly estimated payments to Utah State Tax Commission on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · ConnecticutForm CT-1040NR/PY
File a Connecticut nonresident return only if you performed services inside Connecticut. Connecticut publishes no de minimis day count or dollar floor for nonresidents. Any Connecticut-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 Connecticut Department of Revenue Services nonresident instructions before filing.
- 3Resident return · UtahSchedule TC-40S
File the Utah resident return last and claim the credit for any tax paid to Connecticut.
The two states, side by side
| Utah | Connecticut | |
|---|---|---|
| Taxes wages | Yes — flat | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | Only against convenience-rule states |
| Nonresident return | Form TC-40 with Schedule TC-40B | Form CT-1040NR/PY |
| Credit for other-state tax | Schedule TC-40S | Schedule 2 (Form CT-1040) |
| Nonresident safe harbour | None published | None published |
| Local income tax | No | No |
| Revenue department | Utah State Tax Commission | Connecticut Department of Revenue Services |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Connecticut and working in Utah 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: Utah → ConnecticutBoth states — credit offsets the double tax
- Remote worker: Utah → ConnecticutHome state only
- Moved mid-year: Utah → ConnecticutTwo part-year returns
Other Utah pairs
Questions people actually ask
I live in Utah and my client is in Connecticut. Do I have to file a Connecticut 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 Utah keeps it Utah-source and Utah-taxed. Travel to Connecticut to work and that portion becomes Connecticut-source, needing a Connecticut 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 Utah and Connecticut hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The Utah and Connecticut rules on this page were last checked against Utah State Tax Commission and Connecticut Department of Revenue Services 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.
- Utah State Tax Commission — individual income taxaccessed 2026-08-07
- Connecticut Department of Revenue Services — individual income taxaccessed 2026-08-07