How to Apply for an EIN in South Dakota

The EIN step itself

One federal form, one agency, the same options wherever the business sits: online, fax, mail, or the international phone line. The method decides the timeline, not the state. Every method and what it actually takes covers that in full, and it applies to South Dakota unchanged.

What South Dakota needs first

Form your entity with the South Dakota Secretary of State before applying. The IRS asks for the legal name and formation date exactly as the state recorded them, and a mismatch is one of the common causes of a rejected application.

South Dakota assigns its own business ID. It identifies your company in state records and is not a tax ID. It cannot be used where an EIN is asked for, and the IRS has no record of it.

What South Dakota requires once you have the EIN

• Apply for a South Dakota sales tax license through the Department of Revenue's online Tax License Application, adding a contractor's excise tax license if the LLC does construction work, and then file and pay the returns through EPath, the Department's online filing system.
• File the annual report with the Secretary of State every year by the first day of the anniversary month of the original filing, using the Secretary of State business ID; the report can be filed up to two months early.

What is actually different about South Dakota

• South Dakota has no corporate, unitary or personal income tax, but its sales tax reaches the sale of services as well as goods: a business owes sales tax on its receipts from a product or service unless the sale is specifically exempt by law. Many service-only LLCs that would never register for sales tax in another state still need a South Dakota sales tax license.
• Construction work in South Dakota is taxed through a separate contractor's excise tax, imposed on the gross receipts of prime contractors engaged in construction services or realty improvement projects in the state. Construction services taxed this way fall outside the ordinary sales tax, and the contractor's excise tax license comes from the same Department of Revenue application.
• A 2026 law, House Bill 1102, changes South Dakota's annual report schedule beginning January 1, 2027. Entities may then choose to file either in the anniversary month of their formation or by January 31 each year, a new entity indicates its choice on its formation document, and an entity in good standing can switch between the two with a change-of-filing-date form.
• South Dakota sales tax licenses are not transferable. A change in an LLC's members does not require a new license, but a change in ownership or legal organization does, so a business that moves from a sole proprietorship into a new entity needs a new license.