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Start your S Corp at $0 + state filing fees
Before going into the details, here is your quick checklist for starting an S Corp in California.
An S corporation is a federal tax classification under Subchapter S of the Internal Revenue Code. It is not a standalone business structure. An eligible California LLC or C corporation files IRS Form 2553 to request S corp status. Once approved, the business does not pay federal corporate income tax on its profits. Instead, income and losses pass through directly to shareholders' personal tax returns, where they are taxed at the individual level.
To start an S corporation in California, you first form a business entity, either an LLC or a C corporation, through the California Secretary of State. After your entity is active, you file Form 2553 with the IRS within the required deadline. California automatically recognizes the federal S corp election.
You do not file a separate election with the California Franchise Tax Board. California's tax treatment of S corporations differs from the federal approach in one important way: California taxes S corp net income at 1.5% at the entity level, in addition to pass-through taxation at the shareholder level. Both layers apply, which affects how you calculate the actual tax savings of electing S corp status in California.[2]
Filing Form 2553 on time is one of the most important steps in the process. Miss the window and your election will not take effect until the following tax year.
| Scenario | Deadline | Effective Tax Year |
|---|---|---|
| Existing business, calendar year | March 16, 2026 | 2026 |
| New business formed January 15, 2026 | April 1, 2026 | 2026 |
| New business formed June 1, 2026 | August 15, 2026 | 2026 |
| Filed during prior year (2025) | December 31, 2025 | 2026 |
For existing calendar-year businesses, IRS rules require you to file Form 2553 by the 15th day of the third month of the tax year. In 2026, March 15 falls on a Sunday, so the deadline shifts to March 16, 2026.
New businesses have 2 months and 15 days from their formation date to file. Miss that window, and you will need to request a late election with a reasonable cause statement, or wait until the following tax year for the election to take effect.
If you wanted your S corp election to take effect at the start of 2026, you could have filed Form 2553 at any point during calendar year 2025. For all 2026 filings, use the deadlines above.
LLC members who do not elect S corp status pay self-employment tax (15.3%) on all net profits from the business. With an S corp election, you split your income between a W-2 salary and distributions. Only your salary is subject to payroll taxes. Distributions are not, which can produce meaningful savings at higher income levels, even after accounting for California's 1.5% entity-level franchise tax.[3]
As an S Corp owner, you pay yourself a reasonable salary for the work you do in the business. Any remaining profits can then be taken as distributions. Distributions are not subject to federal self-employment taxes. However, California taxes both the corporation's net income (at 1.5%) and shareholders on their share of pass-through income. Structuring your salary and distributions correctly is especially important in California.
The Tax Cuts and Jobs Act allows qualifying S corp owners to deduct up to 20% of their qualified business income (QBI) from their personal tax returns under Section 199A. Distributions from an S corp may qualify for this deduction, reducing your federal taxable income further. W-2 salary payments do not qualify, so structuring your compensation correctly matters.
California LLCs already avoid federal corporate income tax by default. An S corp election layers on the additional benefit of reducing federal self-employment taxes through the salary-plus-distribution structure. The federal savings can be significant for California business owners earning above roughly $60,000 in net profit, even though California's franchise tax partially offsets the benefit compared to zero-income-tax states.
Operating with an S corp election signals that your California LLC is built for sustainable, tax-efficient growth. It demonstrates to lenders, vendors, and clients that your business is structured and compliance-minded. This can make it easier to open business bank accounts, qualify for financing, and enter professional contracts in California's competitive market.
A C corporation pays federal income tax on its profits at the corporate level. When those profits are distributed to shareholders as dividends, shareholders pay income tax a second time on their personal returns. An S corp election eliminates this federal double taxation layer. Profits pass through directly to shareholders and are taxed once at the individual level for federal purposes. Note that California still applies its 1.5% franchise tax at the entity level in addition to shareholder-level taxation.
S corp shareholders can deduct business losses on their personal tax returns, up to the amount of their basis in the company. C corporation shareholders have no equivalent benefit; losses stay at the corporate level. This pass-through of losses is particularly valuable during startup years or periods of lower revenue.
C corporations that retain earnings beyond reasonable business needs may be subject to the IRS accumulated earnings tax. S corporations avoid this penalty because profits pass through to shareholders each year rather than accumulating at the entity level. This gives California S corp owners more flexibility in how they manage earnings without triggering additional federal tax exposure.
C corporations file Form 1120 and manage corporate-level federal taxes separately from their shareholders' personal returns. S corporations file Form 1120-S, and each shareholder receives a Schedule K-1 reporting their share of income or loss. Many business owners find the S corp pass-through structure more manageable compared to maintaining separate corporate and personal federal tax layers, even with California's additional Form 100S filing requirement.
Selling a C corporation can trigger taxation at two levels: the corporation pays tax on the gain from an asset sale, and shareholders pay again on distributions. An S corp election can allow a sale to be structured in a way that reduces this double layer of tax on the gain, potentially increasing after-tax proceeds when California business owners plan an exit or ownership transfer.
An S corp is a tax classification, not a standalone entity. You must have an active California LLC or C corporation registered with the state before you can file your IRS election. Here is how the full process works.
If you do not already have a registered California business entity, your first step is to form one. Choose the structure that fits your business goals. An LLC is simpler to maintain and works well for most small business owners. A C corporation is a better fit if you need to attract investors or issue multiple classes of stock.
California LLC filings go through the California Secretary of State using the BizFile Online portal. Here are the key steps:
For a full walkthrough of each step, visit our How to Start an LLC in California guide.
If you need a corporate structure before your S Corp election, here are the steps:
For a complete walkthrough, visit our How to Start a C Corporation in California guide.
Already have an active California LLC or C corporation? Skip directly to Step 2.
Once your Texas LLC or C corporation is active, you file IRS Form 2553, the Election by a Small Business Corporation, to officially request S corp tax treatment from the IRS. This single form changes how the federal government taxes your business income. California automatically recognizes the federal election once it is approved. No separate state filing is required with the Franchise Tax Board.
Form 2553 collects the following information:
All shareholders must sign the consent portion of the form before it is submitted. An unsigned form will be rejected by the IRS.
You can submit Form 2553 by mail or fax. There is no filing fee.
Faxing is typically faster than mailing. Keep your fax confirmation receipt. The IRS will send a CP261 acceptance notice to confirm your S corporation election. If your election is not accepted, you will receive a letter explaining the issue.
Missed the Deadline?
If you file after the standard deadline, you may still be eligible for a late election under IRS Revenue Procedure 2013-30, provided you meet certain requirements. See the section below on what to do if you miss the deadline.
Once your S corp election takes effect, IRS rules require you to pay yourself a W-2 salary if you work in the business. This is not optional. Owner-employees of S corporations cannot simply take all their compensation as distributions.
The IRS expects your salary to reflect what someone performing similar work, in the same industry, and in the same region would typically earn. California's high cost of living and competitive professional market mean that comparable salary benchmarks in the state tend to be higher than the national average. Setting your salary too low risks the IRS reclassifying distributions as wages. Setting it too high means you are paying more in payroll taxes than necessary.
Payroll adds ongoing administrative requirements to your business. Many California S Corp owners work with a payroll provider or accountant from day one to keep their compliance records clean and current.
Every S corporation files its own federal tax return each year using IRS Form 1120-S. This is a separate return from your personal Form 1040, and it is due by March 16, 2026, for calendar-year S corporations (March 15 falls on a Sunday in 2026). Each shareholder receives a Schedule K-1 showing their individual share of income or loss, which they use to complete their personal federal tax returns.
In addition to the federal Form 1120-S, California S corporations must file Form 100S: California S Corporation Franchise or Income Tax Return with the California Franchise Tax Board (FTB) each year. This is California's state-level equivalent of the 1120-S, and it reports income, deductions, and the California-specific tax due.[5]
Form 100S is due by the 15th day of the 3rd month after the close of your tax year, March 15 for calendar-year S corporations (or the next business day if March 15 falls on a weekend or holiday). Each shareholder also receives a California Schedule K-1 reflecting their share of state pass-through income.
California taxes S corporation income at both the entity level and the individual shareholder level. This is different from how most states handle S corp taxation:
California's entity-level franchise tax partially offsets the federal self-employment tax savings from S corp status. Working with an accountant who understands California-specific S corp taxation helps you calculate whether and by how much the election improves your after-tax position.
Once your S corp is active, there are ongoing requirements to stay in good standing. Here is what applies specifically to California S corporations.
California S corporations file Form 100S with the Franchise Tax Board each year by March 15 for calendar-year filers. This is separate from your federal Form 1120-S. Missing the deadline can result in penalties and interest from the FTB. A six-month extension is available by filing FTB Form 3539, but any tax owed is still due by the original March 15 deadline.[7]
Your S corporation owes California franchise tax at 1.5% of net income each year, with an $800 minimum. The $800 minimum is due in the first quarter of each accounting period and must be paid even if your S corp is inactive, operating at a loss, or files for a short tax year of less than 12 months. The only exception is for newly formed S corporations in their first taxable year, where the $800 minimum is waived, but first-year net income is still subject to the 1.5% rate.
California S corporations are required to pay estimated franchise tax in advance four times per year using Form 100-ES. Missing an estimated payment installment can result in underpayment penalties from the FTB even if you pay in full by the annual filing deadline.
Your underlying California LLC must file a Statement of Information every two years through the Secretary of State's BizFile Online portal, with a fee. California corporations must file a Statement of Information annually, with a fee. Both are first due within 90 days of formation. A penalty applies if you miss the deadline.[8]
S corporations file Form 1120-S with the IRS each year by March 15 for calendar-year filers (March 16 in 2026). This return reports total income, deductions, and credits, and issues Schedule K-1 to each shareholder. Missing the deadline can result in IRS penalties calculated per shareholder per month.
The IRS requires S corp owner-employees to receive a reasonable salary for work performed in the business. This salary is subject to payroll taxes. California's wage standards and the high cost of operating in the state make salary benchmarking more complex than in many other states. An accountant familiar with your industry and California standards can help you set a defensible compensation level.
S corp owners who work in the business must be on the payroll. Register as a California employer with the Employment Development Department (EDD) to handle California income tax withholding and State Disability Insurance (SDI) contributions. Quarterly payroll returns are filed with both the IRS (Form 941) and the EDD.[9]
California does not issue a single statewide business license, but most cities and counties require local business licenses or tax certificates. If your business involves a regulated profession, the California Department of Consumer Affairs (DCA) and other state agencies oversee licensing and renewal requirements. Check your city, county, and state agency requirements annually.
Missing the IRS filing deadline does not automatically end your options. The IRS provides a path for late elections under Revenue Procedure 2013-30, as long as certain conditions are met.
To qualify for late election relief, your business must meet the following:
If you miss the March 16, 2026, deadline for the current tax year, your S corp election may still apply to 2026 if you file with a valid, reasonable cause explanation.
For LLCs filing a late election, you may also need to file IRS Form 8832 (Entity Classification Election) alongside Form 2553. This step is required when an LLC needs to first elect corporate tax treatment before the S corp designation can apply.
Late elections involve additional IRS review. Many business owners work with a formation service or tax professional to make sure the paperwork is complete and the reasonable cause statement is properly written before submission.
Circumstances change. There may come a point when S corp status no longer fits your business, and revoking the election is the right move.
To revoke the election, shareholders holding more than 50% of the company's stock must file a written revocation statement with the IRS service center where Form 2553 was originally submitted. There is no IRS form for this. It is a letter sent to the same Ogden, UT address used for Form 2553.
File the revocation on or before March 16 of the current tax year (for calendar-year businesses), and it takes effect for that year. File it after that date, and the revocation takes effect the following year.
Once an S corp election is revoked, the entity generally cannot re-elect S corp status for five years without IRS consent.
California's 1.5% entity-level franchise tax means the break-even calculation is different here than in states with no entity-level tax. If any of these situations apply to your California business, it is worth reviewing your tax designation with a qualified California accountant before filing a revocation.
