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Form 1120 is the U.S. corporate income tax return. If you’re a Delaware C-Corp, even if you haven’t made a single dollar, you need to file it. Yes, even with $0 revenue and no customers.
If you’re incorporated as a C-Corp, the IRS expects that 1120. No revenue? No problem. You still file a zero return. Waiting will only trigger late fees, even if you owe nothing.
April 15 for calendar-year C-Corps
File Form 7004 to extend to October 15
Penalties start at $435/month, up to 12 months
You might lose good standing with investors
It’ll definitely mess with future funding rounds
EIN (Employer Identification Number)
Date of incorporation
Ownership info (cap table)
Revenue/expense summary, even if it’s $0
Set a Google Calendar reminder 2 weeks before April 15
Use TaxHero AI to auto-file or extend (7004)
Keep digital receipts + Stripe exports to simplify bookkeeping
Auto-generates your 1120 based on your answers
Tracks your deadlines so you don’t miss them
Handles both the filing AND the extension
More info here - taxhero.vc
Stay compliant year-round, see our 2025 startup tax calendar. Or click https://taxhero.vc/checkin to get your personalized Tax Calendar with auto-reminders for free.
If your startup has foreign ownership, you may need to file Form 5472 (read more - https://taxhero.vc/blogs/form-5472-foreign-founders ).
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