1099 Contractor in Oklahoma with a South Carolina Client: Where Do You File?
Answer
Oklahoma taxes all of it; South Carolina taxes only what you earn on its soil. Nothing is withheld from a 1099, so you pay Oklahoma quarterly. A South Carolina client alone creates no South Carolina filing obligation — performing services inside South Carolina does, and Oklahoma then credits that tax.
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.
South Carolina publishes no de minimis day count or dollar floor for nonresidents. Any South Carolina-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 South Carolina Department of Revenue nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · Oklahoma
Make quarterly estimated payments to Oklahoma Tax Commission on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · South CarolinaForm SC1040 with Schedule NR
File a South Carolina nonresident return only if you performed services inside South Carolina. South Carolina publishes no de minimis day count or dollar floor for nonresidents. Any South Carolina-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 South Carolina Department of Revenue nonresident instructions before filing.
- 3Resident return · OklahomaForm 511-TX
File the Oklahoma resident return last and claim the credit for any tax paid to South Carolina.
The two states, side by side
| Oklahoma | South Carolina | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | No |
| Nonresident return | Form 511-NR | Form SC1040 with Schedule NR |
| Credit for other-state tax | Form 511-TX | Form SC1040TC |
| Nonresident safe harbour | None published | None published |
| Local income tax | No | No |
| Revenue department | Oklahoma Tax Commission | South Carolina Department of Revenue |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in South Carolina and working in Oklahoma 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: Oklahoma → South CarolinaBoth states — credit offsets the double tax
- Remote worker: Oklahoma → South CarolinaHome state only
- Moved mid-year: Oklahoma → South CarolinaTwo part-year returns
Other Oklahoma pairs
Questions people actually ask
I live in Oklahoma and my client is in South Carolina. Do I have to file a South Carolina tax return?
Oklahoma taxes all of it; South Carolina taxes only what you earn on its soil. Nothing is withheld from a 1099, so you pay Oklahoma quarterly. A South Carolina client alone creates no South Carolina filing obligation — performing services inside South Carolina does, and Oklahoma then credits that tax.
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 Oklahoma and South Carolina hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The Oklahoma and South Carolina rules on this page were last checked against Oklahoma Tax Commission and South Carolina Department of Revenue 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.
- Oklahoma Tax Commission — individual income taxaccessed 2026-08-07
- South Carolina Department of Revenue — individual income taxaccessed 2026-08-07