How to Start a Consulting Business in California

California has more Fortune 500 headquarters, venture-backed startups, and professional services firms than any other state. If you’ve spent years building expertise in management, IT, marketing, HR, or strategy, there’s a real market here for what you know. And the mechanics of starting a consulting business are genuinely simple — no inventory, no storefront, no special equipment beyond what you already own.

But California adds a layer of complexity that catches a lot of new consultants off guard. The $800 annual franchise tax hits before you’ve invoiced your first client. AB5 can blur the line between “independent consultant” and “employee” in ways that matter legally. And your combined federal and state tax burden as a self-employed professional in California is among the highest in the country.

This guide covers the California-specific reality — not just the steps, but the actual numbers.

Why California Is Both a Great and Expensive Place to Consult

The demand is real. California’s economy — the fifth largest in the world if it were a country — runs on specialized knowledge workers. Companies routinely hire outside consultants for projects they can’t justify staffing full-time: system implementations, market entry strategies, compliance audits, brand overhauls. If you have 10 or 15 years of experience in a field, someone in California will pay for your time.

The remote work shift helps too. You can run a California-based consulting practice from Sacramento, Fresno, or Redding and serve clients in San Francisco or Los Angeles — or clients in Chicago and New York — without moving or renting office space.

The trade-off is the regulatory and tax environment. California is not hostile to business, exactly. But it is more expensive and more complicated than almost anywhere else, and those complications are front-loaded for new consultants. You’ll pay $800 to the state in year one whether you bill $5,000 or $500,000.

Step 1: Choose Your Business Structure

This decision has more financial impact than anything else you’ll do at setup. Here are your realistic options.

Sole Proprietorship

Zero state filing fees. You’re automatically a sole proprietor the moment you start doing business under your own name. If you want to operate under a business name, you file a DBA (Doing Business As) with your county for around $25–$40. No $800 franchise tax.

The downside: no liability shield. If a client sues you over advice that allegedly caused financial harm, your personal assets are exposed. For low-stakes consulting with clients you trust, this is fine while you’re testing the market. Long-term, it’s a risk most established consultants don’t want to carry.

LLC

Filing fee: $70 at bizfileOnline.sos.ca.gov. That gets you a legal entity separate from yourself — your personal assets stay protected if something goes sideways with a client.

The cost of that protection is the California franchise tax: $800 per year, due to the Franchise Tax Board. First-year payment is due by the 15th day of the 4th month after you form the LLC, then April 15 annually after that. The AB 85 first-year exemption that used to soften this hit expired December 31, 2023. It’s gone. You pay $800 in year one.

Within 90 days of forming your LLC, you also file a Statement of Information (Form LLC-12) with the Secretary of State — that’s $20, then $20 every two years after.

For most consultants earning more than $40,000–$50,000 a year, the LLC makes sense. The liability protection is real and the $800 is just a cost of doing business in California.

S-Corp Election

An LLC or corporation can elect S-Corp tax status with the IRS. The potential benefit: you pay yourself a reasonable salary, and only that salary is subject to self-employment tax (15.3%). Profits above your salary pass through as distributions, avoiding that SE tax.

The math starts working in your favor somewhere around $80,000–$100,000 in net consulting income. Below that, the additional complexity (payroll, bookkeeping, separate tax filings) typically costs more than you save. Talk to a CPA before making this move — it’s the right call for some consultants and overkill for others.

EIN

Regardless of structure, get an Employer Identification Number from the IRS. It’s free at irs.gov, takes about 10 minutes, and you’ll need it to open a business bank account and issue 1099s to any subcontractors you hire.

Step 2: Licenses and Permits

Here’s the genuinely simple part: there is no California state license for consulting. The state doesn’t regulate general business consulting, management consulting, marketing consulting, or most other advisory services. You don’t need to pass an exam or apply to a board.

Exceptions matter, though. If your consulting work touches regulated fields — financial advisory (FINRA/SEC registration), real estate (DRE license), healthcare (various clinical licenses) — you need the relevant professional credential regardless of whether you call yourself a “consultant.” The label doesn’t change the regulatory requirement.

City Business License

Most California cities require a business license or business tax certificate to operate locally. This is separate from your state LLC filing and the fee varies wildly by city — typically $15 to $300+ depending on location and how your city structures its business tax. San Francisco, for example, charges based on gross receipts. Los Angeles has its own business tax registration. Check your specific city.

Home Occupation Permit

If you’re working from home — and most solo consultants are — most California cities allow home-based professional services with minimal restrictions. You may need to file a home occupation permit, which is usually a simple declaration that you’re not running a retail operation or creating noise/traffic issues. Nominal cost, typically under $50.

Seller’s Permit

If you’re selling pure consulting services — time, advice, analysis, strategy — you don’t need a California seller’s permit. Consulting services are generally not subject to California sales tax. But if you sell tangible products alongside your services (printed training manuals, physical deliverables, branded merchandise), you’d need to register with the California Department of Tax and Fee Administration (CDTFA) at cdtfa.ca.gov. Registration is free.

Use calgold.ca.gov to look up permit requirements specific to your city and business type. It’s a state-run permit database that surfaces local requirements you might otherwise miss.

Step 3: AB5 and the Classification Question

AB5 is the law most California consultants either don’t know about or don’t take seriously enough. You should understand it from two directions: how it affects your relationship with your clients, and how it affects anyone you hire.

How Your Clients Classify You

When a company hires you as an independent contractor, California’s ABC test presumes you’re an employee unless the hiring company can prove three things:

A) You’re free from the company’s control in how you do your work
B) You perform work that’s outside the company’s usual course of business
C) You’re customarily engaged in an independently established trade or business

Consulting has a specific exemption under AB 2257 — but the definition is narrow: you must be “providing substantive insight, information, advice, opinions, or analysis that requires the exercise of discretion and independent judgment.” That covers most genuine consulting work.

To qualify for that exemption, you also need to check specific boxes: maintain your own business location, hold a current business license, set your own rates, and have the ability to serve multiple clients.

The scenario that creates real risk: you sign a contract with one company, work at their office on their schedule, use their equipment, and have no other clients. That looks a lot like employment regardless of what the contract says. If the company’s labor attorney or a state auditor takes a close look, they may reclassify you — and the company faces significant penalties for misclassification.

Protect yourself practically: maintain multiple clients, work on your own equipment, set your own hours, and keep your business registration current. These aren’t just contractual formalities. They’re the evidence that you’re actually running an independent business.

How You Classify Your Subcontractors

If you bring in other consultants to help on a project, the ABC test applies to them too. They’re presumed employees under California law unless an exemption applies. If a subcontractor has their own LLC, their own clients, and operates as a genuine independent business — the business-to-business exemption under AB 2257 likely applies. But “I paid someone $5,000 to help me on a project and called them a contractor” isn’t automatically safe. Get contracts that document the independent relationship.

Step 4: Insurance

Two types matter most for consultants.

Professional Liability (E&O)

This covers claims that your advice caused financial harm to a client. If you recommend a marketing strategy that flops badly and the client argues you were negligent, E&O is what pays for your defense and any settlement. For solo consultants, expect $50–$100 per month.

This isn’t optional if you want to work with mid-size or enterprise clients. Many corporate procurement departments require proof of at least $1 million in E&O coverage before signing a consulting agreement. Budget for it from day one.

General Liability

Covers bodily injury and property damage — if you’re meeting clients at their offices and something goes wrong, or if your work causes property damage. Typically $30–$50 per month for a solo consultant.

Corporate clients often require $1 million in general liability coverage alongside the E&O requirement. Bundling both through a business owner’s policy (BOP) is usually the most cost-effective approach.

Workers’ Compensation

If you hire any employees — even one — workers’ comp is mandatory in California. No exceptions, no minimum threshold. Penalties for non-compliance start at $10,000. If you’re staying solo, this doesn’t apply yet.

Cyber Liability

If you handle sensitive client data — financial records, customer information, proprietary business data — cyber liability coverage is worth considering. It’s increasingly a contract requirement from enterprise clients. Cost varies but expect $30–$75 per month for a basic policy.

The Tax Reality for California Consultants

This is where California’s complexity shows up most clearly in your actual bank account.

Self-Employment Tax

As a self-employed consultant, you pay both sides of Social Security and Medicare: 15.3% on net self-employment income. This is federal and it applies regardless of which state you’re in. But it’s the starting point for your total tax calculation.

California State Income Tax

California’s top marginal rate is 13.3% — the highest state income tax rate in the country. The rate is progressive, so you don’t pay 13.3% on every dollar. But a consultant earning $150,000 in net income will see a significant portion taxed in the double-digit brackets.

Add federal income tax (22–24% bracket for that income level) plus the 15.3% self-employment tax (partially offset by the SE tax deduction), and your effective combined marginal rate as a California consultant is in the 40%+ range on higher earnings. That’s the real number. Plan accordingly.

Quarterly Estimated Taxes

No employer is withholding taxes on your behalf anymore. You’re responsible for quarterly estimated payments to both the IRS and the California Franchise Tax Board. Missing or underpaying these triggers penalties. General rule: set aside 30–35% of every invoice payment for taxes, and pay estimated taxes quarterly.

Deductions That Actually Matter

The good news is that legitimate business deductions reduce your taxable income before those high rates apply. Home office deduction (if you use a dedicated space exclusively for business), equipment, software subscriptions, professional development, business travel, health insurance premiums, and your E&O and GL insurance premiums are all deductible on your federal return.

One frustrating California-specific rule: the $800 franchise tax is not deductible on your California state tax return. You can deduct it on your federal return, but California doesn’t allow it as a state deduction. Small thing, but worth knowing.

First-Year Startup Costs

Here’s what to actually budget for:

Cost	Amount
LLC filing (Articles of Organization)	$70
Franchise tax (first year)	$800
Statement of Information	$20
City business license	$15–$300
Professional liability insurance	$600–$1,200/year
General liability insurance	$360–$600/year
Website and basic branding	$300–$1,000
Total first-year estimate	$2,165–$3,990

That’s genuinely low for a professional services business. No inventory, no commercial lease, no equipment financing. The $800 franchise tax stings when you’re pre-revenue, but the total startup cost is manageable even if you launch on savings.

The bigger financial exposure is taxes — not startup costs. A consultant who bills $120,000 in year one and sets aside 20% for taxes will have a painful April. Set aside more than you think you need, find a CPA who works with self-employed professionals, and don’t let the quarterly estimates slide.

The Practical Starting Point

Register your LLC at bizfileOnline.sos.ca.gov. Get your EIN at irs.gov. Pull your city’s business license requirement from calgold.ca.gov. Get an E&O quote from a commercial insurer — Hiscox and Next Insurance both offer online quotes for solo consultants and take about 10 minutes.

Then find a CPA who works specifically with self-employed California professionals before you invoice your first significant client. The franchise tax, quarterly estimated payments, and potential S-Corp election timing are all decisions that benefit from someone who does this every day. That’s not a hedge — it’s the highest-return hour you’ll spend in year one.