Key Takeaways
- $150 Articles of Incorporation filing fee (online filing at sosenterprise.sd.gov) paid to the South Dakota Secretary of State
- Minimum 1 director required (SDCL § 47-1A-803)
- Annual Report (online filing at sosenterprise.sd.gov) due within by the first day of the corporation's anniversary month, beginning the year after incorporation, $55 (online) fee; $50 late fee, then administrative dissolution if left unfiled late penalty
- No South Dakota corporate income tax and no general franchise tax; the only recurring state cost is the $55 Annual Report (the bank franchise tax reaches financial institutions only)
- Registered Agent with a physical South Dakota street address required
- No publication requirement
- S-Corp election available via IRS Form 2553 within 75 days of formation; South Dakota adds no state-level S-Corp tax
- Same-day filing available through LLC Attorney at no markup on state fees
Incorporating in South Dakota means filing Articles of Incorporation with the South Dakota Secretary of State, paying a $150 online filing fee, naming at least 1 director, and keeping up a single annual obligation: a $55 Annual Report due in your anniversary month. What sets South Dakota apart is what is missing — no corporate income tax, no personal income tax, and no general franchise tax. This guide walks through every step and cost of forming a South Dakota C-Corporation, with filing available through LLC Attorney starting at $49.
C-Corp vs LLC in South Dakota
Most first-time owners in South Dakota reach for an LLC, and for good reason. A corporation earns its place when you need transferable stock, an option pool for employees, or the C-Corp structure that outside investors expect — and South Dakota's lack of state income tax makes the corporate form unusually efficient here.
Choose a South Dakota corporation when:
- You plan to raise venture capital or institutional investment. VC firms, angels, and most institutional investors require a C-Corp structure before they write a check. Preferred stock, convertible notes, SAFEs, and board governance by class are native to corporations, not LLCs.
- You want to issue stock options to employees (ISOs). Corporations issue stock; LLCs issue membership interests. ISO and NSO option plans are available to corporations but not to LLCs.
- You expect to eventually go public or sell to a public company. Public markets operate on corporate stock mechanics.
- You are in a regulated industry where corporate structure is required or expected by licensing boards, government contracts, or institutional counterparties.
Stick with an LLC when:
- You are a small business with one or a few owners who will not need institutional investment.
- Pass-through taxation without payroll complexity is the priority.
- You do not need stock option plans or institutional investment mechanics.
Why and when to incorporate in Delaware vs your home state
Delaware is the default for startups on a venture track. Institutional investors expect it, term sheets assume it, and the Court of Chancery resolves corporate disputes faster than any general trial court. If you are raising a priced round or structuring for QSBS eligibility, incorporate in Delaware.
If you are not raising outside capital, South Dakota is usually the better choice. A Delaware corporation operating in South Dakota still has to register as a foreign corporation there, pay South Dakota fees, and file a Delaware franchise tax return each March 1. That is duplicate overhead with no benefit for a business that will not seek institutional investment.
What's Unique About Corporations in South Dakota?
South Dakota's draw is its tax climate rather than a specialized court system. The state has no corporate income tax, no personal income tax, and no general franchise tax, so a South Dakota C-Corp keeps its full after-federal-tax profit at the state level. Combined with some of the country's strongest charging-order and trust statutes, that has turned South Dakota into a magnet for holding companies, captive entities, and asset-protection structures — though operating companies should weigh nexus in the states where they actually do business.
Key South Dakota-specific requirements:
- Articles of Incorporation (not "Articles of Organization" — that is the LLC filing document)
- Minimum of 1 director (SDCL § 47-1A-803); no residency, citizenship, or shareholding requirement
- No South Dakota corporate income tax and no general franchise tax; the only recurring state cost is the $55 Annual Report (the bank franchise tax reaches financial institutions only)
- Annual Report due the first day of your anniversary month — there is no franchise-tax filing to pair with it
- No corporate income tax and no general franchise tax — the recurring state cost is the $55 annual report alone
Selecting a Name for Your South Dakota Corporation
Your corporation's name must comply with South Dakota naming requirements:
- Must include "Corporation," "Incorporated," "Inc.," "Corp.," or another South Dakota-approved designator (SDCL § 47-1A-401)
- Must be distinguishable from all existing South Dakota entities in the South Dakota business filing search
- the name must contain Corporation, Incorporated, Company, or Limited, or one of the abbreviations Corp., Inc., Co., or Ltd., and must be distinguishable on the Secretary of State's records from every entity already on file
- Names implying government affiliation or banking activity are restricted
Search the South Dakota business filing search at sosenterprise.sd.gov before filing. Your name search is not a reservation — the name can be registered by another filer while you prepare your Articles of Incorporation.
Name reservation: file a name reservation with the South Dakota Secretary of State, $25 fee, holding the name for 120 days. Recommended if your paperwork takes more than a few days to prepare.
Directors, Officers, and Shareholders in a South Dakota Corporation
A South Dakota corporation has three distinct roles:
Shareholders own the corporation. They hold stock and vote on major decisions — electing directors, approving mergers, authorizing major asset sales. Shareholders do not manage day-to-day operations.
Directors govern the corporation through a Board of Directors. They set strategic direction, authorize major transactions, and oversee management. South Dakota's director requirements: A South Dakota corporation needs a board of at least 1 director (SDCL § 47-1A-803). Directors do not have to be South Dakota residents, shareholders, or U.S. citizens, and the exact board size is set in the articles or the bylaws. The initial directors may be named in the Articles of Incorporation, or the incorporators can appoint them in the organizational consent after filing.
Officers (CEO, CFO, Secretary, etc.) manage day-to-day operations. Officers are appointed by the Board of Directors. South Dakota requires whatever officers its bylaws or board designate, with one person permitted to hold multiple offices (SDCL § 47-1A-840). One individual can be the sole director and fill every officer role at once, which is the typical structure for a single-owner South Dakota corporation.
Designating a Registered Agent
Every South Dakota corporation must designate a Registered Agent — a person or entity with a physical South Dakota street address who receives legal notices, lawsuits, and official state correspondence on behalf of your corporation.
Every South Dakota corporation must keep a Registered Agent with a physical street address in the state; a P.O. box alone will not satisfy SDCL § 47-1A-501. The agent has to be available during normal business hours to receive service of process and official state correspondence. Out-of-state owners who form South Dakota corporations for tax or asset-protection reasons rely on a commercial agent because they have no in-state office of their own.
If the South Dakota Secretary of State cannot deliver legal notices to your Registered Agent, South Dakota can administratively administratively dissolve your corporation. LLC Attorney's South Dakota Registered Agent service is $125/year.
South Dakota Corporation Costs and Compliance
How to Form a Corporation in South Dakota
If You Do It Yourself
Step 1 — Choose a corporate name that complies with South Dakota's requirements.
Your corporate name must be distinguishable from all existing South Dakota entities and include an approved corporate designator ("Inc.," "Corp.," "Corporation," "Incorporated," or as specified in SDCL § 47-1A-401). Search the South Dakota business filing search at sosenterprise.sd.gov before preparing any documents. South Dakota's name search at sosenterprise.sd.gov shows whether the name is available with the state, but it does not check trademark rights — screen the name against the USPTO database separately before you build a brand on it.
Step 2 — Reserve your corporate name (recommended).
File a name reservation with the South Dakota Secretary of State, $25 fee, good for 120 days. If you are not filing immediately, this prevents another entity from taking your name while you prepare documents.
Step 3 — Decide your director structure before opening the formation form.
South Dakota requires 1 director at formation. Set the board size to match the company you are building today: a solo founder can serve as the only director, while a corporation with co-founders or outside investors usually starts with three. Because South Dakota lets the bylaws fix or adjust the number, decide now whether you want a fixed count or a range, so adding a board seat later does not force an articles amendment. Write down your director names and South Dakota addresses before you open the form — most state portals cannot save a partially completed filing.
Step 4 — Designate your Registered Agent.
Every South Dakota corporation must have a Registered Agent with a physical South Dakota street address. P.O. boxes are not accepted. Most South Dakota incorporators without a local office appoint a commercial registered agent. LLC Attorney can act as your South Dakota Registered Agent and route every state notice and legal document to your online portal.
Step 5 — Complete the Articles of Incorporation (online filing at sosenterprise.sd.gov).
Go to sdsos.gov and use the current version of the Articles of Incorporation. Always file directly through the South Dakota Secretary of State — outdated forms are rejected without refund. Complete it with:
- Your exact corporate name including designator
- Your Registered Agent — full legal name and physical South Dakota street address
- Your authorized share structure — authorize a modest block such as 1,000,000 shares of common stock, since South Dakota's flat $150 filing fee does not scale with share count and there is no Delaware-style authorized-shares franchise tax to manage
- Director names and addresses
- Incorporator signature (the person submitting the form; need not be a director or shareholder)
- The number of shares the corporation is authorized to issue (South Dakota requires the authorized-share total, but the figure does not affect your filing fee)
Step 6 — File the Articles of Incorporation and pay the $150 fee.
File online at sosenterprise.sd.gov or by mail to the South Dakota Secretary of State in Pierre. Online processing is 1 to 3 business days for online filings under normal volume.
Step 7 — Wait for your approved Articles of Incorporation.
Your corporation does not legally exist during the review period. You cannot open bank accounts, sign contracts as the corporation, or issue stock until the South Dakota Secretary of State approves your filing. Standard processing is 1 to 3 business days for online filings; 1 to 2 weeks for mailed paper filings, which run longer during peak periods during peak filing season. Keep your approved Articles of Incorporation — every bank, licensing board, and counterparty will request it.
Step 8 — Hold your organizational meeting and adopt bylaws.
After approval, your Board of Directors must hold an organizational meeting (or sign a written consent in lieu of meeting) to adopt bylaws, elect officers, authorize the bank account, authorize stock issuance, and set the fiscal year. South Dakota does not require bylaws to be filed with the Secretary of State — keep them with your corporate records. South Dakota bylaws are adopted by the incorporators or the initial board under SDCL § 47-1A-206 and are not filed with the state. They control board size, officer roles, and meeting procedure, so draft them to fit how the company will actually operate rather than relying on boilerplate. A generic template may omit South Dakota-specific provisions and may not align with your share structure.
Step 9 — Issue stock to founders.
Authorize and issue shares to founders immediately after your organizational meeting. Document the issuance in your stock ledger and issue stock certificates (or maintain uncertificated share records). Each founder's share count and issuance price must be documented. South Dakota charges the same $150 to incorporate regardless of how many shares you authorize, and the state levies no franchise tax tied to share count, so the share number is purely a governance and cap-table decision. Authorize enough to cover founders, an option pool, and a first outside round; raising the count later requires an Amendment and a $60 fee.
Step 10 — File your initial Annual Report (online filing at sosenterprise.sd.gov) within by the first day of the corporation's anniversary month, beginning the year after incorporation.
After your Articles of Incorporation is approved, you have by the first day of the corporation's anniversary month, beginning the year after incorporation to file online filing at sosenterprise.sd.gov with the South Dakota Secretary of State. This filing confirms your Registered Agent address, principal office address, and director and officer contact information. Filing fee: $55 (online). Missing the deadline triggers a $50 late fee, then administrative dissolution if left unfiled penalty.
Step 11 — Apply for your federal EIN.
Your corporation needs an EIN to open a bank account, hire employees, and handle tax filings. Apply at irs.gov/ein. Free, no government filing fee. Available Monday through Friday, 7 a.m. to 10 p.m. Eastern. 15-minute inactivity timeout — have all information ready before starting. International incorporators without a U.S. SSN or ITIN must apply by phone (IRS Form SS-4, 267-941-1099).
Step 12 — Open a corporate bank account.
Required documents: your approved Articles of Incorporation, your EIN confirmation letter (IRS Form CP 575 or SS-4 approval), your adopted bylaws, a board resolution authorizing the account, and personal ID of authorized signers. Call ahead — bank requirements for corporations are more involved than for LLCs.
Step 13 — Register for South Dakota state taxes.
Your federal EIN does not automatically register you with South Dakota state agencies. Depending on your business type:
- South Dakota sales and use tax (South Dakota Department of Revenue, if you sell taxable goods or services) — dor.sd.gov
- South Dakota employer payroll taxes (South Dakota Department of Labor and Regulation, if hiring South Dakota employees) — dlr.sd.gov
- South Dakota sales tax license (Department of Revenue) — required before selling taxable goods or services in the state; the state rate is 4.2% plus local additions
Step 14 — Pay your South Dakota annual tax.
South Dakota has no corporate franchise tax or income tax for ordinary corporations, so there is no annual tax computation to run and no tax payment portal to log into. Your one recurring state task is the $55 Annual Report, filed online at sosenterprise.sd.gov by the first day of your anniversary month. Pay attention to that single deadline; because there is no franchise-tax bill to remind you, an unfiled report is the most common way South Dakota corporations slip out of good standing.
Step 15 — Decide whether to elect S-Corp tax treatment.
C-Corporation income is taxed twice: once at the corporate level (federal rate currently 21%), and again when distributed to shareholders as dividends. An S-Corp election converts the corporation to pass-through taxation. S-Corp election is available for South Dakota corporations that meet IRS eligibility: 100 or fewer shareholders, all U.S. citizens or residents, only one class of stock, and no institutional or foreign shareholders. File IRS Form 2553 within 75 days of formation. The election is made with the IRS — it does not require any South Dakota filing. Because South Dakota levies no state income tax, an S-Corp election changes nothing on the state side — there is no separate state return, no S-Corp-level state tax, and no pass-through entity tax to file. The election operates purely at the federal level, where it lets shareholder-employees split income between salary and distributions to reduce self-employment tax. South Dakota's neutrality makes the federal cost-benefit analysis the only thing that matters; reserve the election for profitable, closely held corporations that meet the IRS eligibility rules.
Step 16 — Set annual compliance reminders.
South Dakota corporations must file and pay on a recurring basis:
- Annual Report (online filing at sosenterprise.sd.gov): Annually, in the anniversary month, $55 (online) fee — $50 late fee, then administrative dissolution if left unfiled if missed
- Annual Report: $55 online, due the first day of your anniversary month — South Dakota has no corporate income tax and no franchise-tax filing to track alongside it
Missing these filings puts your corporation in bad standing with the South Dakota Secretary of State and South Dakota Department of Revenue. Suspension means you cannot file documents, defend lawsuits, or do business in South Dakota. If you would rather not manage this process, the service handles South Dakota corporation formation starting at $49.
If LLC Attorney Does It for You
- Submit your information at llcattorney.com — corporate name, director structure, authorized shares, Registered Agent preference, fiscal year, and target formation date. No forms to find or download.
- LLC Attorney files your Articles of Incorporation with the South Dakota Secretary of State, drafts your bylaws, handles your organizational meeting consent, issues your stock ledger documentation, applies for your EIN, and covers same-day filing if needed. Your Registered Agent designation and initial Annual Report are included.
- Receive your approved Articles of Incorporation, bylaws, organizational consent, stock documentation, and EIN confirmation through your LLC Attorney client portal. Annual compliance reminders are included so you never miss a online filing at sosenterprise.sd.gov deadline or annual tax payment.
S-Corp Election for South Dakota Corporations — What You Need to Know
An S-Corp election is not a separate entity — it is a federal tax election made by an existing corporation. Your South Dakota corporation remains a South Dakota corporation; you are only changing how the IRS taxes it.
The S-Corp tax advantage: a C-Corp pays 21% federal corporate income tax on net income, and shareholders pay income tax again on dividends. An S-Corp passes income directly to shareholders' personal returns, skipping the corporate-level tax. For owner-operated businesses with consistent profitability above roughly $40,000/year, the S-Corp election typically produces material tax savings.
S-Corp payroll requirement: if you elect S-Corp status and work in the business, you must pay yourself a "reasonable salary" subject to payroll taxes. The savings come from income above that salary, which passes through without payroll tax. Skip the salary and the IRS can reclassify your distributions as wages and assess back payroll taxes plus penalties.
Eligibility requirements:
- 100 or fewer shareholders
- All shareholders must be U.S. citizens or permanent residents
- Only one class of stock (identical distribution and liquidation rights)
- No institutional shareholders, partnerships, or non-resident alien shareholders
South Dakota treatment of S-Corps: Because South Dakota levies no state income tax, an S-Corp election changes nothing on the state side — there is no separate state return, no S-Corp-level state tax, and no pass-through entity tax to file. The election operates purely at the federal level, where it lets shareholder-employees split income between salary and distributions to reduce self-employment tax. South Dakota's neutrality makes the federal cost-benefit analysis the only thing that matters; reserve the election for profitable, closely held corporations that meet the IRS eligibility rules.
Filing deadline: IRS Form 2553 must be filed within 75 days of formation, or by March 15 of the tax year for which you want the election effective. Late elections are sometimes accepted with a written explanation of reasonable cause.
When Should You Consult an Attorney for Your South Dakota Corporation?
LLC Attorney provides on-demand attorney consultations for a flat rate per 30-minute session — no retainer required. Corporation formation benefits from attorney guidance more than most entity types because of share structure, bylaw complexity, and S-Corp election timing. Common scenarios:
- Multiple founders or investors: share structure decisions made at formation (authorized shares, classes, par value) affect every future financing round and exit. A misstructured cap table is expensive to unwind.
- S-Corp election analysis: whether to elect depends on projected net income, payroll requirements, and state-level S-Corp recognition. The payroll requirement catches founders off guard.
- High-liability industry: regulated industries may have specific corporate structure requirements from licensing boards or insurance carriers.
- Raising capital: if you plan to raise institutional capital, your share structure, option pool, and Delaware vs. home-state decision should be reviewed before you file.
- South Dakota-specific wrinkles: South Dakota may have corporate law provisions a generic national template does not cover correctly.
What You Actually Get When You Incorporate in South Dakota with LLC Attorney
A South Dakota corporation that exists only as a state filing is not a working corporation. The Articles create the legal entity, but they do not produce the bylaws, board consents, or stock ledger that make it function and protect the owners. A "$0 filing" that skips those leaves you with an empty shell — and in South Dakota, where so many corporations are formed for holding and asset-protection purposes, an undocumented entity is exactly the kind that fails to hold up under scrutiny.
Included with LLC Attorney corporation formation, starting at $150:
- Same-day or 24-hour South Dakota filing at no markup on the state fee. Most services charge extra to expedite.
- Attorney-drafted bylaws, initial board consent, and organizational minutes — customized, not auto-generated templates.
- Initial stock issuance and cap-table setup, so your ownership is documented correctly from day one.
- Federal EIN, obtained for you.
- South Dakota Registered Agent service at $125/year, included to keep you in good standing.
- S-Corp election guidance when pass-through tax treatment is the right call for your situation.
- Access to attorney-trained Business Success Advisors at no charge, plus optional flat-fee attorney consultations (no retainer).
Because South Dakota's advantage is its tax climate rather than a marquee court system, the value of doing this right is in the structuring — clean bylaws, a documented cap table, and a corporation positioned to capture the no-income-tax benefit without creating problems in the states where you operate.
Starting Your South Dakota Corporation with LLC Attorney
South Dakota's corporate formation requirements are simple but reward planning — share-structure decisions, the choice between an operating and a holding entity, and confirming where the corporation actually creates tax nexus. Getting your directors, share structure, bylaws, and initial compliance filings right at formation prevents expensive corrections later.
The service handles South Dakota corporation formation starting at $49. Same-day filing is available at no markup on state fees. On-demand attorney consultations in 30-minute increments — no retainer — cover bylaws drafting, S-Corp election analysis, South Dakota holding-company structuring and multi-state nexus planning, and annual tax planning. See our full pricing for all service tiers.
Frequently Asked Questions
Online incorporations at sosenterprise.sd.gov are usually processed within 1 to 3 business days. Paper filings sent by mail take roughly 1 to 2 weeks and longer during busy periods. South Dakota does not sell a formal expedited tier for incorporations, so filing online is the fastest route. LLC Attorney files your Articles online and tracks the approval so you have your stamped formation document as soon as the state issues it.
A C-Corp and an S-Corp are the same South Dakota corporation — the difference is federal tax treatment only. A C-Corp pays corporate income tax at the entity level (21% federal rate), and shareholders pay personal income tax again on dividends. An S-Corp elects pass-through taxation — income flows to shareholders' personal returns without corporate-level tax. The election is made with the IRS via Form 2553 and has no impact on your South Dakota formation documents. Since South Dakota imposes no state income tax, the S-Corp decision turns entirely on federal payroll-tax savings rather than any state consequence.
Yes. South Dakota permits a single person to own and run a corporation, acting as the sole director and holding every officer position the bylaws create. This is common for solo founders and for single-owner holding companies organized in the state. To keep the liability shield intact you still need to follow the formalities — adopt bylaws, sign an organizational consent, issue your stock, and keep corporate finances strictly separate from personal funds.
A South Dakota corporation pays no state corporate income tax and no general franchise tax. Profits are taxed only at the federal level — 21% for a C-Corp, or passed through to shareholders if a valid S-Corp election is in place. The corporation's sole recurring state obligation is the $55 Annual Report. Banks and certain financial institutions are the lone exception, paying a separate bank franchise tax that does not apply to ordinary operating or holding companies.
South Dakota corporations file an Annual Report every year, due on the first day of the month in which the corporation was originally formed. The fee is $55 filed online at sosenterprise.sd.gov, or $70 by paper. Filing opens about a month before the due date. Missing the deadline adds a $50 late fee, and prolonged delinquency leads to administrative dissolution. There is no separate franchise-tax filing in South Dakota.
South Dakota does not require corporations to file bylaws with the Secretary of State. However, bylaws are a legal requirement for corporate governance — they define how your board operates, how shareholder meetings work, how officers are appointed, and how major decisions are made. A corporation without bylaws is technically non-compliant and lacks the foundational document that governs all major corporate decisions. Every bank, investor, and serious counterparty will request your bylaws.
South Dakota has no franchise tax, so there is no franchise-tax penalty. The deadline that matters is the Annual Report. Filing late adds a $50 late fee, and continued failure to file lets the Secretary of State administratively dissolve the corporation. A dissolved corporation loses its good standing and its liability shield until it is reinstated, which requires filing the delinquent report and paying the outstanding fees.
Yes. South Dakota allows a corporation to convert to an LLC by filing Articles of Conversion with the Secretary of State along with the LLC's Articles of Organization. The conversion is a taxable event for federal purposes and can trigger gain recognition, so model the tax consequences with a CPA before you file — for some companies it is cleaner to dissolve and re-form depending on assets and basis.
If South Dakota is unable to deliver legal notices to your Registered Agent, the state can administratively administratively dissolve your corporation. This can happen without direct notice to you. A professional Registered Agent service ensures a qualified person is available during business hours at a physical South Dakota address to receive any legal documents on your behalf.