In most of the United States, your employer can stop you from having a second job, or at least restrict what kind of second job you take. Employment is at will in nearly every state, which means a company can set rules about outside work and discipline or fire you for breaking them. How far that power reaches depends on what you signed when you were hired, what your employer’s policies say, the nature of the second job, and whether your state has a law protecting lawful off-duty activity.
Even when nothing is written down, one baseline rule still applies to you.
The Duty of Loyalty Applies With or Without a Policy
Under a long-standing common-law principle called the duty of loyalty, every employee has an obligation not to compete with their employer or help a competitor while the employment relationship is ongoing. This duty is automatic. You don’t have to sign anything for it to bind you.
The practical effect: even if your handbook says nothing about second jobs and you never signed a non-compete, your employer can still act against you for taking on outside work that competes with the business or diverts its customers. You are allowed to make plans for a future competing venture while still employed, but you generally cannot start competing or soliciting your employer’s clients until after you leave.
What to Check in Your Employment Documents
Start with a careful read of everything you signed at hire and anything that has been updated since. The employee handbook is the usual home for rules on outside work. Look for headings like “Outside Employment,” “Secondary Employment,” or “Moonlighting.” These sections usually spell out whether you need to notify your employer, obtain written approval, or avoid certain kinds of work outright.
Your offer letter or employment contract may go further. Pay close attention to two clauses in particular. A non-compete restricts you from working for a competitor for a set time or within a certain area. A non-solicitation clause is narrower and typically stops you from recruiting your employer’s clients, customers, or coworkers for another business.
Also look for a conflict-of-interest policy. These usually bar you from working for a vendor, client, or competitor of your primary employer, on the theory that divided loyalties cloud judgment. Some employers define “conflict” broadly enough to sweep in any outside activity in the same industry, even when the two companies do not directly compete.
Disclosure and Approval Rules
Plenty of employers don’t ban second jobs outright but do require you to disclose them ahead of time or get written approval. This is where people quietly get in trouble. Even if your side work is harmless, failing to disclose when the policy requires disclosure can itself be grounds for discipline or firing. The violation isn’t the second job. It’s the concealment.
Intellectual Property Assignment Clauses
If your side work involves creative, technical, or inventive output, check whether your employment agreement includes an intellectual property assignment clause. These clauses can require you to hand over ownership of inventions, software, or other work product created during your employment. Some are written broadly enough to cover things you build on your own time with your own equipment.
Roughly nine or more states have laws limiting how far these clauses can reach. The typical pattern is that employers cannot claim ownership of inventions you create entirely on your own time, without company resources or trade secrets, when the invention does not relate to the employer’s business or anticipated research. If your agreement contains sweeping IP assignment language but you live in one of these states, the off-duty invention protection may override the contract.
When Employers Have Legitimate Grounds to Restrict Outside Work
Courts consistently recognize several categories as valid reasons for an employer to limit or forbid a second job.
Conflict of Interest
Working for a direct competitor, a supplier, or a major client of your primary employer creates the clearest conflict. Your employer can argue that divided loyalties compromise your judgment, give a competitor access to inside knowledge, or put business relationships at risk. This is the most common and most defensible reason employers restrict moonlighting.
Job Performance
If your second job leaves you tired, distracted, or repeatedly late, your employer has a straightforward basis to step in. This matters most in roles where alertness is a safety issue. No specific anti-moonlighting policy is required. Employers can discipline you for the performance decline itself, whatever the cause.
Safety-Regulated Industries
In some fields, federal law caps how many hours you can work, which effectively limits your ability to hold a second job. Commercial truck drivers face limits on daily and weekly driving hours under federal hours-of-service rules.1eCFR. 49 CFR Part 395 – Hours of Service of Drivers Airline pilots operate under separate flight and duty limits with mandatory rest periods.2eCFR. 14 CFR Part 117 – Flight and Duty Limitations and Rest Requirements An employer in these industries can prohibit any second job that would push you past the applicable limits.
Misuse of Company Resources
Using your work computer, phone, company email, or proprietary software for a side business is a clear breach of your employment duties. It doesn’t matter how minor the use looks. Employers treat this as serious, and it can turn an otherwise permissible second job into a firing offense.
State Laws That Protect Off-Duty Employment
A number of states have “lawful off-duty conduct” or “lifestyle discrimination” statutes that protect employees from being fired or disciplined for legal activities outside of work. Scope varies a lot. Some laws were originally aimed at tobacco use off duty and later broadened. Others were written to cover a wider range of lawful activities, which can include holding a second job.
These protections aren’t unlimited. Even in states with broad statutes, employers can still enforce restrictions when outside work creates a genuine conflict of interest, breaks a reasonable company policy, or interferes with job performance. The laws create a balancing framework, not a blank check. If your second job is completely unrelated to your employer’s business and doesn’t affect your work, you are on the strongest footing. The closer it gets to competing or conflicting, the weaker your protection.
Not every state offers this protection, and those that do define the covered conduct differently. Checking your own state’s law is worth the time before you assume you’re covered.
Non-Compete Agreements and Recent Federal Developments
Non-competes are one of the most common tools employers use to control where you can work after leaving, and they also affect second jobs during employment. If you signed one, your employer can argue that moonlighting for a competitor breaches it even while you’re still on the payroll.
The FTC Rule Did Not Take Effect
In 2024, the Federal Trade Commission finalized a rule that would have banned most non-compete clauses nationwide. The rule never took effect. A federal court blocked enforcement in August 2024, and in September 2025 the FTC voted 3-1 to dismiss its appeals and accept the court’s decision striking the rule down.3Federal Trade Commission. Federal Trade Commission Files to Accede to Vacatur of Non-Compete Clause Rule Non-competes are back to being governed by state law, and enforceability varies widely. Some states bar them almost entirely for most workers. Others enforce them readily.
NLRB Scrutiny
Separately, the National Labor Relations Board’s General Counsel has taken the position that non-competes and “stay-or-pay” provisions such as training repayment agreements may violate the National Labor Relations Act by discouraging employees from exercising their rights to organize and improve working conditions.4National Labor Relations Board. Info for Employees Subject to Non-Compete or Stay-or-Pay Provisions The NLRA protects employees’ right to engage in concerted activities for mutual aid or protection.5Office of the Law Revision Counsel. 29 U.S. Code 157 – Right of Employees as to Organization, Collective Bargaining, Etc. If the NLRB finds that a non-compete violates the Act, it can seek to void the provision and obtain monetary remedies for affected employees. This area of law is still developing, but it gives employees another avenue to challenge overly broad agreements.
What Happens If You Break a Moonlighting Policy
Consequences range from a written warning to immediate termination. Because most employment in the United States is at will, your employer can fire you for any reason that isn’t illegal, and violating a moonlighting policy is a legal reason. A written warning is typical for a first or minor offense. It will document the violation, tell you what to correct, and put you on notice that further violations bring harsher consequences.
Serious violations can trigger immediate firing. That’s most likely when the second job created a direct conflict of interest, hurt your performance, or involved company resources. If you signed a non-compete or non-solicitation agreement and broke it, your employer might also sue, seeking a court order to stop the competing activity and damages for any harm caused.
Effect on Unemployment Benefits
Getting fired for a moonlighting violation can also jeopardize your unemployment benefits. In most states, the question turns on whether the violation counts as “misconduct.” A finding of misconduct generally requires that you knowingly breached a material duty to your employer, that the breach was willful rather than an honest mistake, and that it harmed or tended to harm the employer’s interests. An isolated, minor infraction may fall short of that bar. Deliberately hiding a second job with a competitor after being told the policy likely clears it. The specifics turn on your state’s unemployment law and the facts of your case.