Check our 2025 Tax Deadlines For C-Corp Startups or Click for your customized tax compliance calendar by startup hub
Startup companies based in Miami have several important tax deadlines in 2025, including the April 15th federal and Florida tax return filings (which can be extended until October 15th). Additionally, Florida and the federal government have various tax filings due on the dates listed below.
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.
Miami 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.
Delaware Annual Franchise Report filing deadline. Your Miami startup will pay a minimum of $400, which increases if you have significant funding.
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 Miami 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 Miami startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2023 (Employee Benefits).
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).
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 Miami Startup Tax Deadlines
Florida Estimated Corporate Income Tax payment due – Installment #4 (For Prior Year)
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 Miami 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.
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 Miami 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 Miami startup employees to make contributions to Individual Retirement Accounts (IRAs) for 2023 (Employee Benefits).
Miami startups can claim Research & Development Tax Credits on Form 941.
Florida Corporate Income Tax Return due date (can be extended to November 1).
Florida Estimated Corporate Income Tax payment due – Installment #1.
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).
Florida Estimated Corporate Income Tax payment due – Installment #2.
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).
Florida Estimated Corporate Income Tax payment due – Installment #3.
C Corp Form 1120 Tax Return final due date for Miami startups if extension was filed.
Claim your Research & Development Tax Credits on Form 941.
Extended due date for Florida Corporate Income Tax Return.
Delaware Quarterly Estimated Franchise Tax, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
Florida Estimated Corporate Income Tax payment due – Installment #4.
Federal Quarterly Estimated Tax 4th installment (fourth quarter 2024).
Note: The federal tax deadline in 2025 falls on April 15. The federal extension deadline for 2025 is October 15. Most states usually follow the same calendar for state income tax returns.
If your Delaware C-Corp Miami funded startup needs tax help contact us today!
MIAMI, STARTUPS AND TAXES
Venture capital raised in Miami has steadily increased over the last several years, from $940 million in 2013 to $5.5 billion in 2022, according to Babson Magazine. In the first half of 2024, Miami companies attracted $1.37 billion in investment dollars. According to the 2024 Global Startup Ecosystem Report, Miami has moved up to #16 in the top 20 ecosystems, climbing seven positions from 2023.
The most important taxing authorities for companies based in Miami are:
For Miami-based businesses, the critical tax deadlines in 2025 include the April 15th state and federal tax return deadlines (which can be extended until October 15th) and the various federal and state filings listed in the calendar above.
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 Miami Startup Tax Deadlines
Florida Estimated Corporate Income Tax payment due – Installment #4 (For Prior Year)
Federal Quarterly Estimated Tax 4th installment (fourth quarter 2023).
Miami 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 Miami startup will pay a minimum of $400, which increases if you have significant funding.
Due date for Miami 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 Miami startups are required to file this Federal form by this deadline unless they file an extension.
Miami startups can claim Research & Development Tax Credits on Form 941.
Florida Corporate Income Tax Return due date (can be extended to November 1).
Florida Estimated Corporate Income Tax payment due – Installment #1.
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).
Florida Estimated Corporate Income Tax payment due – Installment #2.
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).
Florida Estimated Corporate Income Tax payment due – Installment #3.
C Corp Form 1120 Tax Return final due date for Miami startups if extension was filed.
Claim your Research & Development Tax Credits on Form 941.
Extended due date for Florida Corporate Income Tax Return.
Delaware Quarterly Estimated Franchise Tax, Pay 20% of estimated annual amount (if annual amount expected to exceed $5,000).
Florida Estimated Corporate Income Tax payment due – Installment #4.
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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