US Tax Filing Deadlines for Businesses: LLCs, Corporations, and Foreign Owners

Learn the essential US tax filing deadlines every business owner must know  including LLCs, C-corps, and foreign-owned entities. Avoid costly penalties like FBAR and Form 5472!

“I started my business last year. There was no revenue, no operations, and certainly no profits   so I assumed I didn’t need to file taxes.”
If this sounds familiar, you’re not alone. We hear versions of this every week during tax season.

So, here’s a clear, no-fluff guide on what you need to file, when to file it, and how to avoid massive penalties   even if your business didn’t make a single dollar.

But first: Do You Have to File a Tax Return with No Revenue?

Yes.
If your U.S. business legally existed during the year   whether or not it made money you are required to file certain federal and state tax forms. Filing does not always mean you’ll pay taxes, but non-filing can result in severe penalties.

C-Corporation Tax Filing Requirements

If your business is registered as a C-corporation, here are the federal and state forms you may be required to file:

• Form 1120 :  U.S. Corporation Income Tax Return
• State Corporate Tax Return : Varies by state
• State Annual Report :  Most states require annual report and franchise tax payment
• Form 5472 : Required if there are foreign shareholders
• Form 5471 : Required if your U.S. corporation owns a foreign subsidiary
• FBAR (FinCEN Form 114):Required if your company had >$10,000 in foreign bank accounts at any time in the year

Federal Filing Deadline: April 15 (or the 15th day of the fourth month after your fiscal year ends)
Extension Available: Yes, using Form 7004 (6 months) to be filed by original due date

Multi-Member LLC (Partnership) Tax Filing Requirements

If your LLC has more than one member, it’s taxed as a partnership by default:

• Form 1065 : U.S. Return of Partnership Income
• Schedule K-1 (for each partner): Shows each member’s share of income/loss
• State Partnership Return : Required in many states
• State Annual Report : Filing frequency and fees vary

Federal Filing Deadline: March 15 (or the 15th day of the third month after your fiscal year ends)
Extension Available: Yes, using Form 7004 (6 months) to be filed by original due date

Single-Member LLC Tax Filing Requirements

Filing obligations for single-member LLCs differ based on ownership:

1. U.S. Based Owner

• Form 1040 + Schedule C: Report business income/loss as a sole proprietorship
• State Annual Report : Depending on the state

2. Foreign Owner (Non-U.S. Resident)

• Pro Forma Form 1120 :  Zero-income declaration
• Form 5472 :  Required for transactions with the foreign owner
• State Annual Report : Still required even with no U.S. presence

Federal Filing Deadline: April 15 (or the 15th day of the fourth month after year-end)
🗓️ Extension Available: Yes, using Form 7004 (6 months) to be filed by original due date

Major Penalties That Can Wipe Out Your Bank Account

Here are the top compliance errors with life-changing financial consequences:

• FBAR (Foreign Bank Accounts): Penalties start at $100,000+ for non-filing or incorrect filing
• Form 5472 (Foreign Shareholders): Penalties start at $25,000 per shareholder, per year
• Form 5471 (Foreign Subsidiaries): Penalty: $10,000 per subsidiary, per year

These penalties apply even if you had no revenue, no expenses, and no transactions. Filing something is often better than filing nothing.

Pro Tip: Automate Your U.S. Business Tax Deadlines

Don’t rely on memory. As soon as your business is incorporated:

• Add all federal and state filing deadlines to your calendar
• Set reminders at least 30 days in advance
• Take active actions

Conclusion: Stay Compliant and Save Yourself from Penalties

The U.S. tax system may feel intimidating, but staying compliant is simpler when you know what to file and when. Whether you run a startup, an LLC, or a holding company, being proactive with your deadlines can save you thousands in penalties and endless stress.

Have a question about your specific situation? Ledgerline can help you by understanding your scenario and preparing a compliance calendar for you.