Tax filing · South Dakota
Business tax filing in South Dakota, prepared by a team of Certified Accountants, CPAs and Enrolled Agents
Federal returns (1120, 1120-S, 1065, Schedule C) and the South Dakota entity filings that still apply, even with no state income tax, prepared from New York and Mumbai for a flat fee quoted upfront, from $99.
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- Certified Accountants, CPAs and Enrolled Agents
- Flat fees quoted upfront
- Replies within 8 hours
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What South Dakota asks of a business
South Dakota has no personal income tax, no corporate income tax and a 4.2% state sales tax (about 6.11% combined with local rates). An LLC in the state faces an annual report of $55, due Annual, anniversary month. The table below is what we check first on every South Dakota engagement.
| South Dakota at a glance | What applies | Notes |
|---|---|---|
| Personal income tax | No personal income tax | No personal income tax |
| Corporate income tax | No corporate income tax | No corporate income tax (bank franchise tax on financial institutions only) |
| Sales tax | A 4.2% state sales tax (about 6.11% combined with local rates) | Combined figure is the population-weighted average with local rates (2026 table) |
| LLC fees | Formation $150; An annual report of $55, due Annual, anniversary month | $55 |
| Corporation fees | Annual report | Corporations file an annual report with the state; fee and date confirmed at engagement |
| S-corp election | Federal election recognised | No income tax; S election has no state effect |
Figures checked 2026-09 against South Dakota Department of Revenue and South Dakota Secretary of State. Rates and fees change; we confirm the current numbers for your entity before we quote.
What we prepare for South Dakota businesses
- Form 1120 (C-corporation) and Form 1120-S (S-corporation)
- Form 1065 with Schedule K-1s (partnerships and multi-member LLCs)
- Schedule C with Form 1040 (sole proprietors and single-member LLCs)
- South Dakota entity-level filings: annual report and any franchise or gross-receipts return
- Form 5472 with pro forma 1120 for foreign-owned single-member LLCs
- Sales tax registration and returns where South Dakota nexus exists
- 1099-NEC filings and extension requests
- Late and unfiled years, with penalty-relief requests where reasonable cause exists
Things South Dakota owners get wrong
No personal income tax does not mean no state filing. South Dakota still expects an annual report of $55, due Annual, anniversary month, and no corporate income tax applies at entity level where relevant. No income tax; S election has no state effect.
Nobody sets out to miss these. They are missed because a seasonal preparer handles the federal return in April and nobody owns the state calendar for the rest of the year. We keep the calendar.
Who we file for in South Dakota
- South Dakota LLCs and S-corps owned by residents
- Foreign-owned South Dakota LLCs (Form 5472 filers)
- E-commerce sellers with South Dakota inventory or customers
- Agencies, consultants and professional practices
- Businesses behind by a year or more
- CPA firms that need white-label preparation capacity
How it works
- Free 30-minute call, or the form on this page.
- Fixed quote in writing, by entity and complexity.
- Secure document upload.
- Draft return for your approval.
- Filed, with confirmation and copies.
Pricing in South Dakota
Business returns from $99, quoted by entity and complexity before any work starts. South Dakota state or entity filings are quoted with the federal return, so there is one number, not a list of add-ons. Late years are priced per year. Catch-up bookkeeping, where needed, is a fixed project quoted after a free review.
We do not write "guaranteed", "maximum refund" or "IRS-approved" anywhere, because no honest preparer can. We prepare returns correctly and keep the confirmations.
South Dakota questions people ask first
Do I need to file a South Dakota state return for my LLC?
South Dakota has no personal income tax, so a pass-through owner does not file a state income tax return on business profit. The entity may still owe an annual report of $55, due Annual, anniversary month and any franchise or gross-receipts tax, which we handle.
When is my South Dakota business return due?
Federal 1120-S and 1065 returns are due March 16, 2026 (September 15 on extension); 1120 and Schedule C returns April 15 (October 15 on extension). South Dakota entity filings run on their own calendar: an annual report of $55, due Annual, anniversary month. We track both.
I own a South Dakota LLC but live outside the US. What do I file?
A foreign-owned single-member LLC files Form 5472 attached to a pro forma Form 1120, which cannot be e-filed and carries a $25,000 penalty if missed. We prepare it, fax-file it and keep the transmission report. Multi-member LLCs file Form 1065 with K-1s.
Does South Dakota recognise my federal S-corp election?
Yes. No income tax; S election has no state effect
What if I am behind by a year or more?
We prepare each open year, rebuild the books if needed, and include a written reasonable-cause request for penalty relief where one applies. Penalty relief is the IRS's decision; we prepare the request and do not promise the outcome.
Who prepares and signs my return?
A team of Certified Accountants, CPAs and Enrolled Agents working from New York and Mumbai. A US-credentialed preparer reviews and signs. Replies within 8 hours, one point of contact.
Ready for a fixed quote in South Dakota?
Two sentences from you. A written price within 8 hours. No obligation, no long-term contract.
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