How to Start a Consulting Business

Choose a Business Structure

A consulting business can operate as a sole proprietorship, which needs no state formation filing if you use your own legal name but offers no liability protection, or as an LLC, which is a separate legal entity shielding personal assets in most circumstances. Many consultants choose an LLC specifically because consulting work carries a professional liability risk: a client dissatisfied with advice or work product can sue, and an LLC helps keep that risk from reaching personal assets like a home or personal savings, as long as the LLC is run as a genuinely separate entity.

Check Whether Your Specific Field Needs a License

General business, management, or marketing consulting typically doesn't require a specialized state license, unlike regulated professions such as legal, medical, financial, or engineering consulting, which carry their own licensing board requirements regardless of the word "consultant" in your title. Check your specific field and state licensing board if your consulting work touches a regulated area, since calling the work "consulting" doesn't exempt it from an underlying professional license requirement.

Get a General Business License if Your City Requires One

Many cities and counties require a general business license or business tax certificate for any business operating within their jurisdiction, including a home-based consulting practice with no storefront. Check your specific city and county, since this requirement and its fee vary significantly by location and are easy to overlook for a service business with no physical location.

Get an EIN and Open a Business Bank Account

Even a solo consultant with no employees benefits from a free EIN from the IRS, which lets you avoid putting your Social Security number on client-facing invoices and is typically required to open a dedicated business bank account. Keeping consulting income and expenses in a separate account from personal finances also supports your LLC's liability protection and makes tax time considerably simpler.

Put a Written Contract in Place for Every Engagement

A consulting engagement letter or contract should specify the scope of work, deliverables, payment terms and schedule, who owns the intellectual property created during the engagement, confidentiality obligations, and how either party can end the engagement early. Most consulting disputes come down to disagreement over scope or payment, both of which a clear written contract addresses before they become a problem rather than after.

Get Professional Liability Insurance

Professional liability insurance, sometimes called errors and omissions (E&O) insurance, covers claims that your advice or work caused a client financial harm, which an LLC's liability protection doesn't cover on its own, since that protection addresses the business's debts and obligations, not a malpractice-style claim against your professional judgment. Many clients, particularly larger ones, require proof of this insurance before signing a contract, so get it in place before your first engagement rather than after a client asks for it.

Set Up Quarterly Estimated Tax Payments

A consultant's income typically has no employer withholding taxes from it, so the IRS requires estimated quarterly payments instead, covering both income tax and the 15.3% self-employment tax on your net earnings, using Form 1040-ES. Missing a quarterly payment can trigger an underpayment penalty even if you pay the full amount owed by the annual filing deadline, so build these payments into your cash flow planning from your first paying client.

Decide on Pricing and Contracts Upfront

Whether you charge hourly, by project, or on retainer affects both your contract language and your own cash flow predictability. Many new consultants start hourly for simplicity and shift toward project or retainer pricing as they get a better sense of how long engagements actually take, since hourly pricing alone can undervalue specialized expertise.

Track Business Expenses From Day One

A consulting business typically has relatively low overhead, but expenses like a laptop, software subscriptions, professional development, and a portion of home office costs are often deductible. Keep organized records from your very first invoice, since reconstructing a year of expenses at tax time is far harder than tracking them as they happen.

A Non-Compete or Conflict-of-Interest Clause Cuts Both Ways

If a client asks you to sign a non-compete or exclusivity clause, read it carefully, since an overly broad one can limit your ability to take on other clients in the same industry. Negotiate the scope and duration before signing rather than assuming it won't matter later.

Subcontracting Work Changes Your Obligations

If you bring in another consultant or contractor to help deliver a client engagement, you take on additional obligations: properly classifying them as a contractor, potentially issuing a Form 1099-NEC, and managing your own liability for their work product under your client contract.

Industry-Specific Rules Can Still Apply

Even general business consulting can brush up against regulated territory, for example, giving specific investment or tax advice without the appropriate license. Confirm where the line falls in your specific niche rather than assuming "consulting" is always unregulated.

Insurance Needs Grow With Client Size

A larger client or a higher-stakes engagement may require higher insurance limits than a typical policy's default coverage. Review your coverage against each significant new contract rather than assuming your starting policy always suffices.

This Is Not Legal or Tax Advice

Which structure, licensing, and insurance fit your consulting practice depends on your specific field and client base. Talk to a tax professional about your estimated tax obligations and an attorney about contract terms before your first major engagement.