The short answer is sooner than most people think. If you’re a contractor, plumber, electrician, or any service business working on other people’s property, operating as a sole proprietor means your personal assets are on the line for anything that goes wrong on a job. An LLC creates a legal barrier between your business liabilities and your personal savings, home, and vehicles.

There are a few clear signals that it’s time to make the switch. If you’re hiring workers or subcontractors, signing commercial contracts, or your annual revenue is growing beyond side-hustle levels, you’re carrying more risk than a sole proprietorship is designed to handle. Many general contractors and property managers won’t even hire subs who aren’t operating as an LLC or corporation, so the structure can directly affect your ability to land work.

The tax benefits are the other major reason. As a sole proprietor, you pay self-employment tax (15.3%) on every dollar of net profit. Once you form an LLC and elect S-corp status with the IRS, you can pay yourself a reasonable salary and take the remaining profit as a distribution that isn’t subject to self-employment tax. This generally starts saving real money when your net income consistently hits $40,000 to $50,000 or more per year. Below that threshold, the savings may not justify the added payroll and filing costs.

Forming an LLC in California does come with some costs to factor in. There’s an $800 annual franchise tax minimum, plus the filing fees. You’ll also need to run payroll for yourself if you elect S-corp status, which adds a layer of administration. These costs are worth it for most established businesses, but if you’re just getting started and still building revenue, it might make sense to wait until income is more consistent.

One thing to keep in mind is that the LLC itself doesn’t automatically change how you’re taxed. A single-member LLC is still taxed as a sole proprietorship by default. You have to file Form 2553 with the IRS to elect S-corp treatment. Getting this right from the start matters because making the election late or structuring your salary incorrectly can trigger IRS scrutiny. Working with a Long Beach bookkeeper who understands trade businesses helps you avoid those mistakes.

Don’t wait until tax season to think about this. The best time to evaluate your entity structure is mid-year when you have a clear picture of where your income is trending. A tax strategy conversation before year-end gives you time to make the switch and start benefiting in the current tax year rather than kicking yourself the following April.