To convert a sole proprietorship to an LLC in California, you file Articles of Organization with the Secretary of State for $70, get a federal EIN, write an operating agreement, file an initial Statement of Information within 90 days for $20, move your business assets and accounts into the new entity, and budget for California’s $800 annual franchise tax from your first year of operation.
The whole process can be done in a week if your name is available and your paperwork is ready. The ongoing costs matter more than the setup costs, so read the tax section before you file.
Pick a Name the State Will Accept
Your LLC name has to be distinguishable from every other business entity already registered with the California Secretary of State. Run your preferred name through the Secretary of State’s online business search before you get attached to it.1California Secretary of State. Business Search
The name must include “Limited Liability Company” or an abbreviation (LLC or L.L.C.), and it cannot contain words that suggest a corporation (“Inc.,” “Corp.”) or imply a government affiliation. If you’ve been operating under your own legal name as a sole proprietor, this is your chance to pick something more marketable. If you’ve been using a trade name, you can usually build the LLC name around it, as long as the state’s database says it’s available.
Line Up a Registered Agent
Every California LLC must continuously maintain an agent for service of process in the state. The agent is who gets served if your business is sued and who receives official government notices. The agent must be either a California resident with a physical street address (no P.O. boxes) or a corporation authorized to act as an agent in California.2California Legislative Information. California Corporations Code 17701.13
You can be your own agent if you’re reliably at a California street address during business hours. Commercial registered agent services generally run $50 to $300 per year and keep your home address off the public record. Have the agent’s name and address ready before you file.
File the Articles of Organization
Filing Form LLC-1 with the Secretary of State is what actually creates your LLC. The form asks for the LLC’s name, the registered agent’s name and address, and whether members or designated managers will run the company. Filing is online only through the bizfile Online portal, and the fee is $70.3California Secretary of State. Limited Liability Companies – California
Once the Secretary of State accepts the filing, your LLC legally exists. Online filings usually confirm quickly, though processing times vary. Save the stamped Articles. You’ll need them to open a bank account and to apply for or amend licenses.
Get an EIN from the IRS
An Employer Identification Number is a nine-digit federal tax ID. You need one if your LLC will have employees or file excise returns, and you’ll want one even as a single-member LLC: banks almost always require it to open a business account, and it keeps your Social Security number off business paperwork.4Internal Revenue Service. Employer Identification Number
The application is free, takes about five minutes on the IRS website, and the number is issued immediately. Apply after your Articles are accepted, because the IRS asks for your LLC’s legal name and formation date.
Write an Operating Agreement
California requires every LLC to have an operating agreement, including single-member LLCs. You don’t file it with the state; you keep it with your business records. The agreement sets out ownership, how profits and losses are allocated, each member’s responsibilities, and what happens if a member leaves or the LLC dissolves.
Converting from a sole proprietorship, this probably feels like paperwork for its own sake. It isn’t. The operating agreement is your primary evidence that the LLC is a separate legal entity from you. If a court can’t see a clear separation between you and the business, it can “pierce the veil” and hold you personally liable, which defeats the entire reason for forming an LLC. The operating agreement, a separate bank account, and clean bookkeeping are what hold the shield up.
File the Initial Statement of Information
Within 90 days of filing your Articles of Organization, you must file a Statement of Information (Form LLC-12) listing your principal office address, your registered agent, and your managers or members. The fee is $20.5California Secretary of State. Instructions for Completing the Statement of Information (Form LLC-12)
Missing the deadline brings penalties from the Franchise Tax Board and can lead to suspension of the LLC.6California Secretary of State. Statements of Information Filing Tips After the first one, you refile every two years during a six-month window tied to your formation month. Put it on the calendar now.
Move the Sole Proprietorship Into the LLC
A sole proprietorship has no separate legal existence from you, so there’s no formal entity-to-entity merger. You still have to deliberately move the business into the LLC, or you end up with an LLC on paper and a sole proprietorship in practice.
Equipment, inventory, vehicles, and intellectual property used in the business should be contributed to the LLC as capital contributions and documented in the operating agreement. For titled property, file the transfer with the right agency: the DMV for vehicles, the county recorder for real estate. If a vehicle or property has a loan or lien, contact the lender first, because most lenders need to approve the transfer. Record every asset you move in, with its value and the date.
Then work through the operational pieces:
- Open a new business bank account under the LLC’s name and EIN. Don’t keep running transactions through the old sole proprietorship account, even for a transition period.
- Contact every agency that issued you a business license or permit. Some will amend to the new entity; some require a new application.
- Review contracts with clients, vendors, and suppliers for assignment clauses, notify the other party in writing, and sign an assignment agreement where one is required.
- Update your business insurance so the LLC is the named insured. Policies under your personal name or the old business name won’t cover the LLC.
If your sole proprietorship operated under a fictitious business name (a DBA), file a statement of abandonment with the county clerk, then file a fresh FBN under the LLC’s name if the LLC will do business under any name other than the exact name on file with the Secretary of State. For example, if the LLC is registered as “Smith Consulting LLC” but you market as “Smith Creative,” the LLC needs its own FBN filing in the county where your principal office sits. Fees vary by county.
California Taxes You’ll Owe
The $800 Annual Franchise Tax
Every California LLC owes an $800 annual franchise tax, regardless of revenue or profit. The first payment is due by the 15th day of the fourth month of your taxable year, which for a calendar-year LLC means roughly four months after you file your Articles.7Franchise Tax Board. Limited Liability Company The tax keeps running every year until you formally cancel the LLC with the Secretary of State. Not doing business doesn’t excuse it.8California Legislative Information. California Revenue and Taxation Code 17941
The first-year exemption California offered to LLCs formed between January 1, 2021, and January 1, 2024, has expired. LLCs formed in 2025 or later owe the full $800 from year one.7Franchise Tax Board. Limited Liability Company
The Income-Based LLC Fee
If your California-source total income passes $250,000, you owe an additional annual fee on top of the $800:7Franchise Tax Board. Limited Liability Company
- $250,000 to $499,999: $900
- $500,000 to $999,999: $2,500
- $1,000,000 to $4,999,999: $6,000
- $5,000,000 or more: $11,790
The fee is based on total income, not profit. A business with $400,000 in revenue and $380,000 in expenses still owes the $900. Estimate and pay the fee by the 15th day of the sixth month of your tax year.
Federal Tax Treatment
By default, the IRS treats a single-member LLC as a “disregarded entity.” The LLC itself doesn’t file a federal return; you report business income and expenses on Schedule C of your Form 1040, exactly as you did as a sole proprietor, and you still owe self-employment tax on net earnings.9Internal Revenue Service. Single Member Limited Liability Companies
You can elect S-corporation treatment (Form 2553) or C-corporation treatment (Form 8832) instead. The S-corp election is popular with profitable small businesses because it lets you split income between a reasonable salary (subject to payroll taxes) and distributions (not subject to self-employment tax). The savings generally start to outweigh the added payroll and compliance costs once net business income clears roughly $60,000 to $80,000 per year. To make the election effective for the current tax year, file within two months and 15 days of the start of that tax year; for a brand-new LLC, that clock starts on your Articles of Organization filing date.
Close Out the Sole Proprietorship
With the LLC running, shut the old business down cleanly. Close any bank accounts, credit lines, or payment processors under the sole proprietorship’s name. Cancel any licenses or permits that couldn’t be transferred, so you aren’t billed for renewals on a business that no longer exists.
On your personal return for the conversion year, file a final Schedule C covering the period you operated as a sole proprietor. If you were a sole proprietor January through June and converted in July, that final Schedule C reports only the January-through-June activity. The LLC’s activity from July forward is reported separately, even when it lands on the same Form 1040. Keeping the two periods cleanly split from day one makes life much easier if the IRS or Franchise Tax Board ever has questions.