1099 Contractor in South Dakota with a South Carolina Client: Where Do You File?
Answer
The client's address is not the test. South Dakota has no personal income tax, so nothing is owed at home; South Carolina taxes nonresidents on income from services performed within South Carolina, so if you never travel there to work, there is nothing to file. Days on site change that.
Last verified
The most common contractor worry — that invoicing an out-of-state client creates a filing obligation there — is usually unfounded. What creates the obligation is physical presence, and South Dakota residents have no home-state return in any case.
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
- 1Nonresident return · South CarolinaForm SC1040 with Schedule NR
File a South Carolina nonresident return only for income from services you physically performed in South Carolina. South Dakota does not tax wage or self-employment income.
The two states, side by side
| South Dakota | South Carolina | |
|---|---|---|
| Taxes wages | No | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | No |
| Nonresident return | Not applicable | Form SC1040 with Schedule NR |
| Credit for other-state tax | No income tax | Form SC1040TC |
| Nonresident safe harbour | Not applicable | None published |
| Local income tax | No | No |
| Revenue department | South Dakota Department of Revenue | 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 South Dakota gives:Home state only — estimated payments.
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: South Dakota → South CarolinaWork state only
- Remote worker: South Dakota → South CarolinaNo state income tax on your wages
- Moved mid-year: South Dakota → South CarolinaOne part-year return — the state you moved to
Other South Dakota pairs
Questions people actually ask
I live in South Dakota and my client is in South Carolina. Do I have to file a South Carolina tax return?
The client's address is not the test. South Dakota has no personal income tax, so nothing is owed at home; South Carolina taxes nonresidents on income from services performed within South Carolina, so if you never travel there to work, there is nothing to file. Days on site change that.
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 South Dakota 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 South Dakota and South Carolina rules on this page were last checked against South Dakota Department of Revenue 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.
- South Dakota Department of Revenue — individual income taxaccessed 2026-08-07
- South Carolina Department of Revenue — individual income taxaccessed 2026-08-07