Check our 2025 Tax Deadlines For C-Corp Startups or Click for your customized tax compliance calendar by startup hub
In 2025, San Jose has many corporate tax deadlines beyond the traditional April 15th tax return date. San Jose’s business tax is due on the 15th day of the calendar month in which the business began. See the calendar below for a more complete list.
Delaware Quarterly Estimated Franchise Tax. Pay 40% of estimated annual amount (if annual amount expected to exceed $5,000).
Delaware Quarterly Estimated Franchise Tax. Pay 20% of your estimated annual amount (if annual amount expected to exceed $5,000).
C Corp Form 1120 Tax Return final due date for San Jose startups if extension was filed.
Delaware Quarterly Estimated Franchise Tax, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
Click The Links To Learn More About These Filings And 2025 San Jose Startup Tax Deadlines
Claim Research & Development Tax Credits on Form 941, and file annual Federal Unemployment Tax Act (FUTA) return on Form 940. Use our handy calculator to estimate your possible research and development tax credit.
Delaware Annual Franchise Report filing deadline. Your San Jose startup will pay a minimum of $400, which increases if you have significant funding.
IRS 30-day automatic extension: provide Form 1095-B and Form 1095C to employees.
571-L Business Property Tax for County of Santa Clara filing due. Initial deadline.
Deadline to file California Corporation Franchise or Income Tax Return (Form 100). Minimum amount due is $800.
C Corp Form 1120 Tax Return due. The Federal Form 1120 is the U.S. Corporation Income Tax Return, which the IRS has companies use to report their income, losses, credits, etc., and to figure the income tax liability of the corporation. Can extend the deadline to Oct. 15. All San Jose startups are required to file this Federal form by this deadline unless they file an extension.
Federal Quarterly Estimated Tax 1st installment (first quarter 2024).
File the R&D Tax Credit Form 6765 with your tax return. Can extend to October 15. We strongly recommend working with a qualified CPA to prepare this form in conjunction with your Form 1120 if you are a high-growth startup – if your company is going to be acquired by a major technology company, that company’s CFO will use a strong tax team to do due diligence on this.
Due date for San Jose startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2023 (Employee Benefits).
San Jose startups can claim Research & Development Tax Credits on Form 941.
571-L Business Property Tax filing due. Final date to avoid 10% penalty.
Delaware Quarterly Estimated Franchise Tax. Pay 40% of estimated annual amount (if annual amount expected to exceed $5,000).
Federal Quarterly Estimated Tax 2nd installment (second quarter 2024).
Claim Research & Development Tax Credits on Form 941 .
Delaware Quarterly Estimated Franchise Tax. Pay 20% of your estimated annual amount (if annual amount expected to exceed $5,000).
Federal Quarterly Estimated Tax 3rd installment (third quarter 2024).
C Corp Form 1120 Tax Return final due date for San Jose startups if extension was filed.
Claim your Research & Development Tax Credits on Form 941.
Delaware Quarterly Estimated Franchise Tax, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
Federal Quarterly Estimated Tax 4th installment (fourth quarter 2024).
California Statement of Information due. Pay $25.
Note: The federal tax deadline for 2025 is April 15 and the federal extension deadline is October 15.
How Much Does a Startup Tax Return Cost? Try Kruze Consulting’s Tax Preparation Pricing Tool.
If your Delaware C-Corp San Jose funded startup needs tax help contact us today!
SAN JOSE, STARTUPS AND TAXES
San Jose is California’s third largest city, and in 2022 Forbes reported that San Jose was rated the top city for small businesses by Biz2Credit, marking the third year that San Jose took the top spot. San Jose is a center for artificial intelligence research – in 2023 the San Jose metro area had over 10,000 AI patents, according to Industry Insider. Many tech giants have headquarters or a significant presence in San Jose, including Adobe, Cisco Systems, PayPal, and eBay. San Jose also offers a large number of incubators, accelerators, and other opportunities for entrepreneurs to find support for their startups. San Jose also boasts two prestigious educational institutions, Santa Clara University and San Jose State University.
The most important taxing authorities for companies in San Jose are:
In 2025, San Jose has many corporate tax deadlines beyond the traditional April 15th tax return date. San Jose’s business tax is due on the 15th day of the calendar month in which the business began. See the calendar above for a more complete list.
2024 startup tax deadlines are supplied for reference purposes only, and should not be used when making decisions in 2025 or beyond. Always consult your tax professional, and see our disclaimer below.
Click The Links To Learn More About These Filings And 2024 San Jose Startup Tax Deadlines
Federal Quarterly Estimated Tax 4th installment (fourth quarter 2023).
San Jose startups should send 1099s to contractors. Send W2s to employees and e-file 1099-MISC for non-employee compensation with the IRS. Or file Form 8809 for a 30-day extension to file W2s and 1099-MISC for non-employee compensation.
Claim Research & Development Tax Credits on Form 941, and file annual Federal Unemployment Tax Act (FUTA) return on Form 940. Use our handy calculator to estimate your possible research and development tax credit.
IRS 30-day automatic extension: provide Form 1095-B and Form 1095C to employees.
Delaware Annual Franchise Report filing deadline. Your San Jose startup will pay a minimum of $400, which increases if you have significant funding.
571-L Business Property Tax for County of Santa Clara filing due. Initial deadline.
Deadline to file California Corporation Franchise or Income Tax Return (Form 100). Minimum amount due is $800.
Due date for San Jose startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2023 (Employee Benefits).
File the R&D Tax Credit Form 6765 with your tax return. Can extend to October 15. We strongly recommend working with a qualified CPA to prepare this form in conjunction with your Form 1120 if you are a high-growth startup – if your company is going to be acquired by a major technology company, that company’s CFO will use a strong tax team to do due diligence on this.
Federal Quarterly Estimated Tax 1st installment (first quarter 2024).
C Corp Form 1120 Tax Return due. The Federal Form 1120 is the U.S. Corporation Income Tax Return, which the IRS has companies use to report their income, losses, credits, etc., and to figure the income tax liability of the corporation. Can extend the deadline to Oct. 15. All San Jose startups are required to file this Federal form by this deadline unless they file an extension.
San Jose startups can claim Research & Development Tax Credits on Form 941.
571-L Business Property Tax filing due. Final date to avoid 10% penalty.
Delaware Quarterly Estimated Franchise Tax. Pay 40% of estimated annual amount (if annual amount expected to exceed $5,000).
Federal Quarterly Estimated Tax 2nd installment (second quarter 2024).
Claim Research & Development Tax Credits on Form 941 .
Delaware Quarterly Estimated Franchise Tax. Pay 20% of your estimated annual amount (if annual amount expected to exceed $5,000).
Federal Quarterly Estimated Tax 3rd installment (third quarter 2024).
C Corp Form 1120 Tax Return final due date for San Jose startups if extension was filed.
Claim your Research & Development Tax Credits on Form 941.
Delaware Quarterly Estimated Franchise Tax, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
California Statement of Information due. Pay $25.
View tax compliance dates for Austin, Boston, New York City, Palo Alto, San Francisco, Santa Monica, Seattle, Washington DC, Atlanta, Salt Lake City, Mountain View, Chicago, Dallas, Miami, and San Jose
How Much Does a Startup Tax Return Cost? Try Kruze Consulting's Tax Preparation Pricing Tool.
How much can your startup save in payroll taxes? Estimate your R&D tax credit using our free calculator.
Every startup is different and so are its tax compliance needs. This is only a guideline. Please consult your tax professional. IRS Circular 230 Disclaimer: To ensure compliance with IRS Circular 230, any U.S. federal tax advice provided in this communication is not intended or written to be used, and it cannot be used by the recipient or any other taxpayer for the purpose of avoiding tax penalties that may be imposed on the recipient or any other taxpayer. Copyright © Kruze Consulting
Check our 2025 Tax Deadlines For C-Corp Startups or Click for your customized tax compliance calendar by startup hub
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