One of the most important financial decisions a contractor makes isn’t about a specific job or client — it’s about how their business is legally structured. The right business structure provides liability protection, minimizes taxes, and positions the business for growth. The wrong structure can cost you thousands of dollars in unnecessary taxes every year and leave your personal assets exposed to business liabilities. This guide compares the three most common business structures for California contractors: sole proprietorship, LLC, and S-Corporation.
The Sole Proprietorship: Simple but Limited
A sole proprietorship is the default structure for anyone doing business without formally establishing a separate entity. If you obtained your CSLB license as an individual and never formed an LLC or corporation, you’re a sole proprietor. Business income is reported on Schedule C of your personal tax return. There’s no separation between you and your business — legally or financially.
The sole proprietorship’s biggest drawbacks are liability exposure and self-employment tax. On the liability side, there’s no separation between business and personal assets — a judgment against your business is a judgment against you personally, putting your home, savings, and personal property at risk. On the tax side, all net profit is subject to self-employment tax (15.3% on the first $160,200 in 2023, then 2.9% above that) plus federal and California income taxes. For a contractor netting $150,000, that’s over $22,000 in self-employment taxes alone.
The LLC: Essential Liability Protection
A California LLC (Limited Liability Company) provides a critical layer of protection between your business and your personal assets. If the business is sued or faces a judgment, your personal home, savings, and personal property are generally protected — as long as you maintain proper separation between business and personal finances (separate bank accounts, separate expenses, no commingling).
By default, a single-member LLC is taxed as a sole proprietor (Schedule C) and a multi-member LLC is taxed as a partnership. The liability protection is there, but the self-employment tax is the same as a sole proprietor. California adds an $800/year minimum franchise tax for LLCs, plus a graduated annual LLC fee based on gross revenue (starting at $900 for revenue over $250,000). Despite these costs, every contractor doing meaningful revenue should have an LLC for the liability protection alone — the cost of not having it is far greater than the cost of maintaining it.
The S-Corporation: The Tax Efficiency Structure
An S-Corporation is not a separate business entity — it’s a tax election that an LLC or corporation makes with the IRS. A California contractor typically forms an LLC, then elects S-Corp tax status. This changes how the business income is taxed in a significant way: instead of all profits being subject to self-employment tax, an S-Corp owner pays themselves a “reasonable salary” (subject to payroll taxes) and takes the remaining profit as a distribution (not subject to self-employment tax).
Example: A contractor netting $180,000/year. As a sole proprietor or LLC taxed as sole proprietor, all $180,000 is subject to SE tax — roughly $25,000. As an S-Corp with a $80,000 reasonable salary, only $80,000 is subject to payroll taxes — roughly $12,000. The distribution of the remaining $100,000 is not subject to self-employment tax, saving approximately $13,000/year. Over a career, this is hundreds of thousands of dollars in tax savings.
The S-Corp election adds administrative requirements: you must run formal payroll for yourself, file a separate business tax return (Form 1120-S), and maintain more rigorous corporate formalities. California also imposes an additional 1.5% state franchise tax on S-Corp net income (minimum $800). But for contractors netting $80,000+ per year, the S-Corp typically saves significant net tax even after these additional costs.
Which Structure Is Right for Your Contracting Business?
If you’re just starting out with modest revenue (under $50,000/year net), start with an LLC for liability protection. The tax efficiency of an S-Corp doesn’t outweigh the administrative costs at this income level. As revenue grows and net profit consistently exceeds $60,000–$80,000/year, analyze the S-Corp election with your CPA. The analysis should compare total taxes in both structures, including California franchise taxes, payroll administration costs, and bookkeeping costs for the more complex structure. At $100,000–$200,000+ in net profit, the S-Corp almost always wins on a net tax basis for California contractors.
CSLB Licensing and Business Structure
When you change your business structure, you may need to update your CSLB license. A license issued to an individual does not automatically transfer to an LLC or corporation — you need a new entity license. The entity must have a Qualifying Individual (RMO or RME) who holds the appropriate license classification. Work with a CSLB-experienced attorney or licensing consultant to handle the entity license properly, and ensure your bond and insurance are updated to reflect the new entity name.
Frequently Asked Questions
How do I elect S-Corp status for my existing LLC?
File IRS Form 2553 (Election by a Small Business Corporation) with the IRS. The election can be made anytime during the prior tax year or by March 15 of the current tax year for it to be effective for the current year. Late elections are sometimes accepted with reasonable cause. For California, file FTB Form 3560. Work with your CPA to make the election correctly and set up payroll immediately upon S-Corp election.
What is a “reasonable salary” for an S-Corp contractor?
The IRS requires S-Corp owner-employees to pay themselves a reasonable salary for their services to the business. “Reasonable” is generally interpreted as what you would pay someone else to do your job. For contractors doing the work themselves, this might be in the range of $60,000–$100,000 depending on your trade, experience, and the going market rate for your services. Your CPA should help you determine a defensible reasonable salary for your specific situation.
For more information, see our guide on tax obligations for each structure.
For more information, see our guide on CSLB licensing requirements by entity type.
For more information, see our guide on business insurance requirements.
For more information, see our guide on tax deductions available to your business.
Let Bookkeeping Champs Help With the Transition
Bookkeeping Champs helps contractors throughout Los Angeles and Ventura County set up the right business structure and the bookkeeping systems to support it — including S-Corp payroll setup, LLC accounting, and financial reporting for any entity type. Call (818) 679-4451 for a free consultation.
Leave a Reply