Top 10 Mistakes to Avoid When Starting a Business

1. Skipping Real Market Validation

It's tempting to move straight from an idea to spending money on it. The SBA's research framework exists specifically to confirm real demand first, using secondary data to answer broad questions and primary research like surveys and interviews to test your specific offering. Skipping this step means your first real test of demand happens after you've already spent the money, which is the most expensive way to find out an idea needs adjusting.

2. Choosing a Structure Without Weighing the Tradeoffs

Defaulting to a sole proprietorship because it's simplest, or forming an LLC without understanding what it actually protects, both carry risk. A sole proprietorship leaves personal assets exposed to business debts and lawsuits; an LLC or corporation adds protection but also a filing fee and ongoing requirements. Choose deliberately based on your liability exposure and tax situation, not just which option requires the least paperwork today.

3. Underestimating Startup and Ongoing Costs

The SBA splits startup costs into one-time expenses and ongoing monthly costs, and recommends adding roughly 10% on top as a buffer for the unexpected. A common mistake is budgeting only for formation and initial inventory or equipment, then being surprised by recurring costs like license renewals, annual reports, and insurance premiums that continue indefinitely.

4. Mixing Personal and Business Finances

Running business transactions through a personal bank account, or the reverse, makes bookkeeping harder and, for an LLC or corporation, is one of the clearest ways a court can find the entity isn't being treated as genuinely separate from its owner. Open a dedicated business bank account before your first transaction, not after several months of commingled records.

5. Overlooking Required Licenses and Sales Tax Registration

Many new owners assume forming an LLC or corporation with the state covers their legal obligation to operate. It doesn't. Federal licenses apply only to specific regulated industries, but state and local licenses are broader, and selling taxable goods or services generally requires its own sales tax permit from your state's tax agency, before your first sale, not after.

6. Misclassifying Workers as Contractors

Treating someone as an independent contractor to avoid payroll taxes and benefits, when the IRS's behavioral control, financial control, and relationship factors actually point to an employee, is a well-known compliance risk. Misclassification can mean owing back payroll taxes, penalties, and benefits the worker should have received, so classify roles based on the actual working relationship, not on what's most convenient.

7. Letting Compliance Lapse After Launch

It's easy to focus entirely on the launch and forget that most states require an ongoing annual or biennial report to keep an LLC or corporation in good standing, with fees ranging from $0 to $500 a year depending on the state. Missing these deadlines can eventually lead to administrative dissolution, which undoes the liability protection the original formation was meant to provide.

8. Skipping Business Insurance

The SBA recommends general liability insurance for any business and professional liability insurance for service businesses, yet many new owners treat insurance as optional until something goes wrong. The cost of a policy is generally far smaller than the cost of an uninsured claim.

9. Treating an EIN or Formation Filing as Optional Busywork

Some owners delay getting a free EIN from the IRS or skip it entirely if their structure technically allows using a Social Security number instead. Since most banks and many vendors require an EIN regardless, this delay just pushes a necessary step later, often at a less convenient time.

10. Not Talking to a Tax Professional Early

Many of the costliest mistakes, choosing the wrong tax election, missing a deduction, or misunderstanding self-employment tax, are avoidable with a short conversation before the business launches rather than after a problem surfaces on a tax return. A tax professional's fee is typically much smaller than the cost of correcting an avoidable mistake after the fact.

Most of These Mistakes Compound Over Time

A single missed license or a few commingled transactions rarely sink a business on their own, but left unaddressed, they tend to compound, more mixed transactions, another missed deadline, until untangling the problem costs far more than preventing it would have.

Free Resources Exist for Most of These Issues

The SBA's local assistance network, including Small Business Development Centers, offers free counseling that touches on several of these mistakes, structure selection, market validation, and basic compliance, before they happen, not just after.

Fixing a Mistake Is Usually Possible, Just More Expensive

A missed license can typically be obtained after the fact, a misclassified worker's status can be corrected, and even an administratively dissolved LLC can often be reinstated. None of this is unfixable, but every one of these fixes costs more in money, time, or penalties than getting it right from the start.

This Is Not Legal or Tax Advice

Which of these risks matter most for a specific business depends on its industry, structure, and situation. Talk to a tax professional or attorney early, rather than only after one of these mistakes has already caused a problem.

Review This List Again After Your First Year

Some of these mistakes, like letting compliance lapse, tend to happen well after launch, once the initial focus on getting started has faded. Revisiting this list at your first annual report deadline is a useful habit, not just a one-time read before you open.