South Dakota Non-Compete Agreement Laws: What Employees Need to Know

Non-compete agreements in South Dakota are enforceable when they meet strict statutory requirements under SDCL § 53-9-11. However, South Dakota courts apply an exceptionally strict “all or nothing” approach—if any element of the agreement is unreasonable, the entire agreement is void. Unlike most states, South Dakota courts will NOT use blue-pencil reformation to modify an overbroad restriction. This makes careful drafting essential for employers and creates significant uncertainty for employees.

If you’re a South Dakota worker asked to sign a non-compete or facing enforcement of one, understanding your rights is critical. The state’s rigid approach can work in your favor, but only if you know how to challenge an unreasonable restriction. This guide explains South Dakota’s unique non-compete landscape, what courts will enforce, and how to protect yourself.

Key Facts

What Makes a Non-Compete Enforceable in South Dakota

South Dakota law requires that a non-compete agreement be “reasonable in its terms respecting the time during which such restriction is to exist, the area or jurisdiction within which it is to exist, and the line of business or type of activity to which it is to be restricted.” Under SDCL § 53-9-11, the agreement must also protect a legitimate business interest, such as trade secrets, confidential business information, substantial relationships with specific prospective or existing customers, or goodwill associated with an ongoing business or professional practice.

The critical distinction in South Dakota is the court’s refusal to use blue-pencil reformation. If you challenge a non-compete as overbroad in duration, geographic scope, or scope of activity, and the court finds even one element unreasonable, the entire agreement is struck down. There are no second chances for employer overreach. This “all or nothing” rule makes South Dakota particularly unforgiving of broadly drafted restrictions and gives employees a strong argument when fighting overbroad terms.

Income Thresholds and Worker Exemptions

South Dakota has no income threshold for non-compete agreements. The statute applies equally to high-earning executives, mid-level managers, and entry-level employees. There are no categorical exemptions based on job title, industry, or compensation level. However, the “all or nothing” enforcement rule provides meaningful protection for workers across all income levels: if an employer drafts a restriction that’s too broad for your actual role, you can argue it’s unreasonable and potentially void the entire agreement.

What Happens If You Violate One

If you violate a non-compete agreement in South Dakota, your former employer can file a civil lawsuit seeking injunctive relief (a court order prohibiting you from working or competing). Additionally, they may seek damages for breach of contract, including lost profits, harm to business relationships, or other quantifiable losses. If the court finds the agreement reasonable and enforceable, you could face:

• An injunction prohibiting you from working in your industry or for competitors during the restriction period
• Monetary damages for losses your former employer suffered
• Your former employer’s attorney fees (courts may award these in contract disputes)
• Potential difficulty securing employment if competitors know you’re under an enforceable restriction

However, if you can demonstrate that any element (duration, geographic scope, or scope of activity) is unreasonable, the entire agreement fails, and you’re free to work.

Real Situations in South Dakota

Sioux Falls IT Professional (Technology): Marcus, a software developer in Sioux Falls, signed a two-year non-compete when hired by a mid-sized financial software company. His former employer later tried to enforce it against his new role at a competitor across the state. Marcus challenged the geographic scope, arguing that a statewide restriction was unreasonable for a Sioux Falls-based business with only local and regional clients. The court agreed the restriction was overbroad and voided the entire agreement under SDCL § 53-9-11, allowing Marcus to continue his new job. The employer had drafted the agreement too broadly to survive South Dakota’s strict standard.

Rapid City Sales Manager (Retail/Sales): Jennifer managed a car dealership in Rapid City and signed a non-compete prohibiting her from working for any car dealer in South Dakota for two years. When she left to work for a dealership in Spearfish (200 miles away), her former employer sued. The court found the statewide scope unreasonable because Jennifer had only worked with customers in the Rapid City area and the employer had minimal presence outside that market. The entire non-compete was voided. This case illustrates how South Dakota courts examine whether the geographic scope actually matches the employer’s legitimate business interests.

Aberdeen Manufacturing Employee (Manufacturing): Tom worked in a manufacturing plant in Aberdeen and was required to sign a non-compete as a condition of employment with no consideration beyond at-will employment. When he attempted to join another manufacturer in the same town, his former employer filed for an injunction. Tom argued the agreement lacked adequate consideration (a required element) and the court agreed, finding the employer provided no additional benefit or protection to support the restriction. The agreement was voided entirely.

Common Mistakes South Dakota Employees Make

Not challenging overbroad restrictions immediately. Many employees assume that if they signed a non-compete, it must be enforceable. In reality, South Dakota’s “all or nothing” rule means a single unreasonable element voids the entire agreement. If a restriction seems too broad (statewide when you only worked locally, five years when two is the norm, or industry-wide when you performed a narrow role), consult an attorney before complying. Challenging it early can mean the difference between unemployment and your freedom to work.

Assuming geographic scope is determined by state borders. South Dakota is geographically large, but courts carefully examine whether the restriction matches the employer’s actual business operations. A statewide restriction for a Sioux Falls business may be unreasonable; a 50-mile radius around Aberdeen may be perfectly reasonable. The key is nexus to where the employer actually operates and serves customers.

Failing to document consideration. Non-compete agreements must be supported by adequate consideration (something of value the employee receives in exchange). If you signed a non-compete when hired, courts typically find at-will employment or continued employment as sufficient. However, if the employer added it later and offered nothing new in return, you have a strong argument the agreement is unenforceable. Keep records of what the employer promised when you signed.

What to Do If You Have a Non-Compete

1. Read and understand the exact terms. Do not assume you understand your non-compete based on a summary. Pull the full agreement and identify: (a) the duration restriction, (b) the geographic area, (c) the scope of prohibited activities. Write these down clearly.

2. Assess reasonableness against your actual job. Ask yourself: Was my work truly global/statewide, or was it local/regional? Did I access trade secrets or sensitive client lists, or was my role routine? Did the employer have legitimate interests to protect? If the restriction seems broader than necessary for your role, it may be unreasonable.

3. Consult an employment attorney before taking a new job. If you’re considering a new role that might conflict with your non-compete, speak with a South Dakota employment lawyer first. They can review the agreement and advise whether the new position violates it. Getting a legal opinion upfront is far cheaper than defending a lawsuit later.

4. Request a release or modification from your former employer. Before job hunting, ask your former employer (in writing, via email) to release you from the non-compete or acknowledge the agreement is unenforceable. Many employers will cooperate, particularly if the restriction is overbroad and vulnerable to challenge.

5. If sued, immediately file a motion to dismiss or challenge enforceability. If your former employer sues to enforce the non-compete, file a counterclaim arguing the agreement is unreasonable. South Dakota’s “all or nothing” rule makes this a powerful defense. Do not default or fail to respond. Contact the South Dakota Department of Labor and Regulation (https://dlr.sd.gov) for resources, and retain counsel immediately.

Related Guides

• Complete Employment Rights Guide
• South Dakota Wage Theft Laws: What Workers Need to Know
• Small Claims Court Guide: Suing Your Employer

Disclaimer

This article provides general information about South Dakota non-compete laws and is not legal advice. Employment law is complex and fact-specific. Non-compete agreements are enforceable under SDCL § 53-9-11 only if reasonable in time, area, and scope. South Dakota courts apply a strict “all or nothing” approach and will not use blue-pencil reformation to modify unreasonable terms. If you are subject to a non-compete agreement or facing enforcement, consult a licensed South Dakota employment attorney for advice specific to your situation. Laws change; verify current requirements with the South Dakota Department of Labor and Regulation.