How to Start a South Dakota Limited Partnership — Step by Step

Before anything gets filed, your proposed name has to be available and compliant. South Dakota requires the name of a limited partnership to be distinguishable from every other business entity already on file with the Secretary of State — corporations, LLCs, other LPs, and reserved names all count.

Run your candidate through the South Dakota business name search. Try the exact name and near variations. Small differences — dropping "the," swapping "and" for an ampersand, changing punctuation — usually are not enough to make two names distinguishable, so if something close is already registered, choose a stronger alternative rather than risk a rejected filing.

Naming rules for an LP

• The name must include a limited partnership designator: "Limited Partnership," "L.P.," or "LP."
• It cannot imply a purpose the partnership is not authorized for, or falsely suggest a government affiliation.
• Restricted words tied to banking, insurance, or trust activity may require approval from the relevant regulator before the name is accepted.

Optional: reserve the name

If you have settled on a name but are not ready to file, South Dakota lets you reserve it with the Secretary of State for a set period. A reservation holds the name while you assemble the rest of the filing; it does not create the partnership.

The Certificate of Limited Partnership names your registered agent, so you need that decided before you file. The agent is the LP's official recipient for lawsuits, subpoenas, and state correspondence, and must be reachable at a physical South Dakota street address during business hours.

Who can serve

• Yourself or a general partner, if you have a South Dakota street address (not a P.O. box) and are reliably available during the day. That address goes on the public record.
• Another trusted person with a qualifying South Dakota address — a partner, an attorney, an employee.
• A commercial registered agent service, which supplies a professional South Dakota address, guarantees business-hours availability, and keeps your own address off the public certificate.

Why it matters for an LP

Out-of-state investors are common in limited partnerships, and general partners frequently manage from elsewhere. If no partner has a South Dakota address — or you would rather not publish a home address on a searchable state record — a commercial agent is the clean solution. It also means a missed lawsuit never happens because someone was traveling on the day process arrived.

The Certificate of Limited Partnership is the document that legally creates your LP. You file it with the Secretary of State's Business Services Division, either online through the sosenterprise portal or on paper by mail. Online is same-day; mail runs one to two weeks.

What the certificate contains

• Partnership name, with its required LP designator.
• Designated office address in South Dakota — the LP's office of record, which can differ from where you actually operate.
• Registered agent name and South Dakota street address.
• Name and address of each general partner. These parties are public; limited partners are not listed.

The certificate is deliberately thin. You do not disclose limited partners, ownership percentages, capital contributions, or the terms of your deal. All of that lives in your private partnership agreement, not on the state's record.

The certificate creates the entity; the limited partnership agreement governs it. South Dakota does not require you to file this document, and it never becomes public — but operating an LP without one is a serious mistake, because in its absence the state's default statutory rules decide questions the partners never actually agreed on.

What the agreement should settle

• Capital contributions. What each general and limited partner puts in, and whether more can be called for later.
• Profit and loss allocation. How gains and losses are split — this does not have to track capital contributions, and in real deals it often does not.
• Distributions. When cash goes out, in what priority, and on what triggers.
• General partner authority. What the general partner can do unilaterally and what requires limited partner consent.
• Limited partner rights. Information rights, voting on fundamental changes, and — critically — the boundary that keeps limited partners passive enough to preserve their liability shield.
• Transfers and admissions. How interests change hands and how new partners are admitted.
• Dissolution. The events that wind up the partnership and how assets are distributed.

For a multi-partner investment vehicle, this document is the deal. Have it drafted or reviewed by an attorney; it is not a form to skip.

A limited partnership needs an Employer Identification Number — a nine-digit federal tax ID — because it files a partnership return and cannot operate on an individual's Social Security number. The IRS issues an EIN at no cost.

Why the LP needs one

• Every partnership files Form 1065 and issues Schedule K-1s to partners; that requires an EIN.
• Banks require an EIN to open the partnership's account.
• If the LP hires employees, the EIN is used for payroll tax reporting.

How to apply

Use the IRS EIN Assistant at IRS.gov to file your request online. The whole thing runs about ten minutes, and since the IRS assigns the number right away, it is yours to use before the day is out. The online form requires a responsible party with a US Social Security number or ITIN. If the responsible party has neither, the LP applies by fax or mail using Form SS-4, which takes longer.

Keeping the LP's money separate from the partners' personal money is essential. Commingled funds undermine the liability structure — particularly for limited partners relying on their protected status — and make the partnership's accounting a mess.

What a bank typically asks for

• The filed Certificate of Limited Partnership from the Secretary of State
• The IRS EIN confirmation
• The limited partnership agreement (many banks want to see who has authority to act for the LP)
• Government-issued ID for the general partner or authorized signers

Because South Dakota has no state income tax and a well-developed trust and financial-services environment, in-state banks are used to handling investment partnerships. Compare account fees, minimum balances, and signer arrangements before committing, especially if multiple general partners need signing authority.

South Dakota keeps the maintenance burden on limited partnerships light, but there are still things to stay on top of.

Registered agent and office

The LP must maintain its registered agent and designated office continuously. If the agent resigns, moves, or you switch providers, file the change with the Secretary of State promptly. An LP with a stale or invalid agent address is out of compliance even if everything else is fine.

Keep the record current

When general partners are added or removed, or the partnership's public information changes, amend the certificate so the state's record stays accurate. The private partnership agreement should be updated to match.

Federal taxes and licensing

File Form 1065 each year and deliver K-1s to the partners. South Dakota imposes no state income tax, but if the LP sells taxable goods or services it must register with the Department of Revenue for sales and use tax. Industry-specific licenses — real estate, securities, and the like — are separate from the entity filing and run on their own schedules.