California Business Tax Requirements — File smarter, Stay Compliant
Understand what your business needs to file in California. From corporate income taxes to LLC filings and extensions, stay on top of every requirement and deadline to avoid penalties.
What are the Business Tax Forms in California?
California requires different business entities to file specific state tax forms with the Franchise Tax Board (FTB).
Here’s a breakdown by business type:
Sole Proprietorship &
Single-Member LLC
- Federal Form 1040 – Individual Income Tax Return
- Form 540 - California Resident Income Tax Return
- Form 540-NR - California Non-Resident or Part-Year Resident Income Tax Return
C Corporation
- Form 100 – California Corporation Franchise or Income Tax Return
- Form 100-ES Corporation Estimated Tax
- Form 100W - California Corporation Franchise or Income Tax Return-Water's –Edge Filers
S Corporation
- Form 100S – California S Corporation or Income Tax Return
Pass-Through Entities
- Form 3893 – Pass- Through Entity Elective Tax Payment Voucher
- Form 3804 – Pass- Through Entity Elective Tax Calculation
- Form 3804-CR – Pass-Through Entity Elective Tax Credit
Additional California Business Tax Forms
- Form 3872 – California Disaster Relief Request for Postponement of Tax Deadlines
- SCH H (100) – Dividend Income Deduction
- SCH H(100S) – Dividend Income Deduction
- Schedule K-1(100S) – Shareholder’s Share of Income, Deductions, Credits, etc.
- SCH B (100S) – S Corporation Depreciation and Amortization
- SCH C (100S) – S Corporation Tax Credits
- SCH D (100S) – S Corporation Capital Gains and Losses and Built-In Gains
- SCH D (541) – Capital Gain or Loss
- SCH S – Other State Tax Credits
- SCH K-1 (565) – Partner’s Share of Income, Deduction, Credits, etc.
- SCH K-1 (568) – Member’s Share of Income, Deduction, Credits, etc.
- SSCH H (100W) – Dividend Income Deduction- Water's Edge Filers
- SCH EO (565) – Pass- Through Entity Ownership
- SCH EO (568) – Pass-Through Entity Ownership
What are the deadlines for the Business Tax Forms in California?
Understand the key deadlines for filing California business taxes for all entity types:
General Partnerships
Return due date:
15th day
of 3rd month
Limited Partnerships / LLPs / LLLPs
Return due date:
15th day
of 3rd month
Limited Liability Companies (LLCs)
Return due date:
15th day
of 3rd month
S Corporations
(Form 100S)
Return due date: 15th day of 3rd month
Payment due date: 15th day of 3rd month
C Corporations
(Form 100 / 100W)
Return due date: 15th day of 3rd month
Payment due date: 15th day of 3rd month
Exempt Organizations (Form 199 / 109)
Return due date:
15th day
of 5th month
What Business Extension Forms are required in California?
Business Type
- Corporation & Exempt Organizations Form FTB 3539
- Limited Liability Companies (LLCs) Form FTB 3537
- Limited Partnerships, LLPs, or REMICs Form FTB 3538
Mail Form FTB 3539, FTB 3537, FTB 3538 of the following address:
Franchise Tax Board
PO Box 942857
Sacramento, CA 94257-0531
California Business tax payments can also be made (no registration required) at: Webpay for Businesses
What are the Extended due dates for Business Tax
Forms in California?
General Partnerships
Extended due date:
15th Day
of 10th month
Limited Partnerships / LLPs / LLLPs
Extended due date:
15th Day
of 10th month
Limited Liability Companies (LLCs)
Extended due date:
15th Day
of 10th month
S Corporations (Form 100S)
Extended due date:
15th Day
of 9th month
C Corporations
(Form 100 / 100W)
Extended due date:
- Tax year 2018 & prior: 15th day of 10th month
- Tax year 2019 & later: 15th day of 11th month
Exempt Organizations (Form 199 / 109)
Extended due date:
15th Day
of 11th month
California Business Tax Extension Filing Requirements
To qualify for a business tax extension in California, your business must:
- File or pay by the original due date to avoid late penalties.
- Submit the correct extension form based on your entity type (Form 3537, 3538, or 3539).
- Estimate and pay any taxes owed - extensions only apply to filing, not to payments.
- Meet the 6-month filing window, typically extending your deadline to October 15.
- Keep records and confirmations from the Franchise Tax Board (FTB) for compliance.
California Business Tax Rates
Business tax rates vary depending on your entity type:
C Corporation
8.84%
of net income
S Corporation
1.5%
of net income
LLCs
$800
minimum annual franchise tax plus LLC fee ($900–$11,790 based on income).
Partnerships (LP & LLPs)
$800
minimum annual tax
Exempt Organizations
Exempt
Generally, exempt but may pay on unrelated business income
Estimated Tax Payments for California Businesses
Businesses in California must make estimated tax payments if they expect to owe
$500 or more in state income tax for the year. These prepayments help you avoid underpayment of penalties.
Payment Deadlines
1st payment
April 15
2nd payment
June 15
3rd Payment
Sept 15
4th Payment
Dec 15
Who should pay
Corporation & S Corps
If expected tax > $500
LLCs
Based on total income and applicable LLC fees.
Sole Proprietors & Partnerships
Pay using Form 540-ES.
Missed Payments: Late or missed estimated payments may lead to interest and penalties.
Penalties and Interest for Business in California
If your business doesn’t pay the required tax by the original due date,
penalties and interest may apply—even if you’ve filed an extension.
Late Payment Penalty
5% of the unpaid tax plus 0.5% for each month (or part of a month) the payment is late, up to a maximum of 25%
Late Filing Penalty
5% of the unpaid tax plus 5% for each additional month (or part of a month), up to 25% of the unpaid amount.
Interest
Charged daily on any unpaid balance until it’s fully paid. The rate is adjusted quarterly and follows the California FTB interest rate.
How TaxZerone can Help You?
TaxZerone makes tax filing simple and secure by supporting federal filings and guiding you through state requirements, ensuring accuracy, compliance, and confidence whether you’re filing for your business or yourself.
Stay on top of California business tax filing requirements
learn what forms your business needs, important deadlines, and how
TaxZerone helps you stay informed and compliant.
Frequently Asked Questions
1. What forms does my business need to file in California State?
The specific forms your California business needs to file depend on its legal structure. Below is a breakdown of the common filings required for each business type:
For Corporations
- Form 100: California Corporation Franchise or Income Tax Return
- Form 100S: California S Corporation Franchise or Income Tax Return (for S-corps)
- Annual Report: Must be filed with the California Secretary of State
- Form K-1: Issued to shareholders to report their share of income, deductions, and credits
For LLCs (Limited Liability Companies)
- Form 568: LLC Return of Income
- Schedule K-1: For members to report income and losses
- LLC Fee: Based on total income (if applicable)
- Minimum Franchise Tax: An annual $800 tax may apply even if the LLC is not actively conducting business
For Sole Proprietorships
- Schedule C (Form 1040): Profit or Loss from Business (Sole Proprietorship)
- Form 1040: Primary California tax form for residents
- Form 540NR: Used by non-residents or part-year residents
2. Does California automatically grant extensions for businesses?
3. How do I get an extension of time to file in California?
4. What happens if I don’t pay my taxes by the original due date in California?
Even with an automatic extension, failing to pay your taxes by the original due date may result in penalties and interest. To avoid this, make sure you submit your payment on time — even if you plan to file later.
