Starting a Business While Employed: Legal Guide

Review Your Employment Agreement

The first step is reading every document you signed when you were hired. Most employees sign an offer letter, an employment agreement, and sometimes separate documents for non-compete, non-solicitation, confidentiality, and intellectual property assignment. These documents may contain restrictions that directly affect your ability to run a side business. If you cannot find your copies, ask HR for duplicates. Read every clause carefully, since the restrictions that matter most are often buried in dense legal language.

The three clauses most likely to affect a side business are non-compete agreements, intellectual property assignment clauses, and conflict of interest or moonlighting policies. Even if your employment agreement does not contain these clauses, your employee handbook might include policies that restrict outside business activities. The handbook is typically considered part of your employment terms, so ignoring it is not a safe strategy.

Non-Compete Agreements

A non-compete agreement restricts your ability to work for or operate a business that competes with your employer, usually for a specified time period (6 to 24 months) and within a specified geographic area. If you signed a non-compete, it may prevent you from starting a side business in the same industry as your employer. A software engineer at a SaaS company who signs a non-compete cannot start a competing SaaS product as a side business. The same engineer can almost certainly start an ecommerce store selling physical products because it does not compete with the employer's software business.

Non-compete enforceability varies dramatically by state. California, Oklahoma, North Dakota, and Minnesota effectively ban non-compete agreements for employees (with narrow exceptions). The FTC has also issued rules limiting non-compete enforceability nationwide, though the scope and enforcement are still evolving as of 2026. Many other states enforce non-competes only if they are "reasonable" in scope, duration, and geographic reach. A non-compete that prevents you from working in any business, in any location, for five years would likely be found unenforceable. A non-compete that prevents you from working at a direct competitor within 50 miles for 12 months is more likely to be upheld.

If your non-compete is potentially problematic, consult an employment attorney in your state. Many offer a one-hour consultation for $150 to $300, which is a worthwhile investment if the alternative is your employer suing you after you launch. The attorney can advise on whether the clause is enforceable, whether your planned side business falls within its scope, and how to structure your business to minimize risk.

Intellectual Property Assignment Clauses

IP assignment clauses (sometimes called "invention assignment" or "work product" clauses) state that any intellectual property you create during your employment belongs to your employer. The broadest versions claim ownership over anything you create while employed, regardless of whether it relates to your employer's business or was created on your own time using your own equipment. Less aggressive versions are limited to work created during work hours, using company equipment, or related to the company's business.

California law (Labor Code Section 2870) specifically protects employee inventions that are developed entirely on the employee's own time, without using employer equipment or resources, and that do not relate to the employer's current or reasonably anticipated business. Several other states (Delaware, Illinois, Minnesota, North Carolina, Washington) have similar protections. Even in states without specific statutory protection, courts generally will not enforce IP assignment clauses that claim ownership over completely unrelated work done on personal time with personal equipment.

To protect yourself: never work on your side business during work hours, never use your employer's computer, phone, email, or internet connection for side business activities, never use any employer-owned tools, software, or resources, and keep clear records showing when you worked on your side business (evenings, weekends) and what equipment you used (your personal devices). If there is any overlap between your side business and your employer's industry, be especially careful about IP issues and consider getting legal advice before launching.

Moonlighting and Conflict of Interest Policies

Many companies have policies that require employees to disclose outside business activities or get approval before starting a side business. These policies are typically in the employee handbook rather than the employment agreement. Some companies require disclosure only if the side business could create a conflict of interest. Others require disclosure for any outside business activity. A few prohibit moonlighting entirely, though this is becoming less common.

If your employer requires disclosure, the safest approach is to disclose. Frame it positively: "I am starting a small ecommerce business selling home goods on the side. It is completely unrelated to our company's work, and I will ensure it does not affect my performance or availability." Most employers are fine with side businesses that do not compete or interfere with job performance. If your employer denies permission and you proceed anyway, you risk termination for violating company policy, regardless of whether the side business itself is legal.

Even without a formal policy, avoid obvious conflicts. Do not use your employer's client list to find customers for your side business, do not redirect business opportunities from your employer to your own company, do not work on your side business during work hours, and do not recruit your employer's employees or contractors for your own venture. These actions can create legal liability even without a written policy prohibiting them.

Tax Implications of a Side Business

Side business income is taxable regardless of how small it is. If your side business earns any profit, you must report it on your tax return. For sole proprietors and single-member LLCs, this means filing Schedule C with your personal Form 1040. The net profit from your side business is subject to both income tax (at your marginal rate) and self-employment tax (15.3%). Since your employer already withholds income tax from your wages, you may need to increase your W-4 withholding or make quarterly estimated tax payments to avoid an underpayment penalty at tax time.

The good news is that legitimate business expenses reduce your taxable profit. Home office deduction, business supplies, inventory costs, shipping costs, software subscriptions, marketing expenses, mileage for business errands, and professional services (CPA, legal) are all deductible. Keep detailed records and receipts for every business expense from day one. Our tax planning guide covers deductions for self-employed business owners in detail.

Your side business income might push you into a higher tax bracket for income tax purposes, since it is added on top of your employment income. For example, if your salary is $70,000 and your side business earns $30,000 in net profit, you are taxed on $100,000 total income plus self-employment tax on the $30,000. Plan for this by setting aside 25% to 35% of your side business profit for taxes, either by increasing your W-4 withholding or making quarterly estimated payments.

When to Transition to Full-Time

The right time to leave your job and go full-time on your business depends on your financial situation and risk tolerance. Conservative benchmarks include: your side business consistently earns enough to cover your essential living expenses (rent, food, insurance, debt payments) for at least three consecutive months, you have six months of living expenses saved as an emergency fund separate from business funds, you have a clear growth trajectory showing that the business is still growing (not plateauing or declining), and you have replaced your employer-provided health insurance with a private plan or marketplace coverage. See our health insurance guide for self-employed workers for options.

Many entrepreneurs jump too early, before the business can support them, and many wait too long, letting the safety of employment prevent them from giving the business the attention it needs to grow. The financial benchmarks above protect you from the first mistake. For the second, consider whether your side business has reached a ceiling that can only be broken with full-time attention. If you have maxed out the hours you can invest evenings and weekends, and the business is clearly constrained by your time rather than by market demand, that is a strong signal that going full-time would accelerate growth.