Form 1120
Form 1120 is the IRS tax return that US corporations file annually to report income and calculate federal tax liability. For non-US founders with a US LLC taxed as a corporation, understanding Form 1120 is essential to compliance.
What is Form 1120?
Form 1120 is the U.S. Internal Revenue Service form used by C corporations to report annual income, deductions, and tax liability. It's filed with the IRS by April 15 following the end of the tax year (or your chosen fiscal year). Even if your business earned zero income, some structures require filing.
Why does a non-US founder need to know about Form 1120?
When a non-US founder elects to have their US LLC taxed as a corporation (rather than as a disregarded entity), Form 1120 becomes the filing requirement. Additionally, if your foreign-owned LLC has a US source of income and is structured as a single-member LLC, the IRS may require Form 1120 filing plus Form 5472 (informational return of U.S. persons with respect to certain foreign corporations), which must be filed even at zero income. Failure to file Form 5472 incurs a $25,000 penalty per the IRS.
Key sections of Form 1120
- Income (gross receipts, returns, cost of goods sold)
- Deductions (salaries, rent, utilities, professional fees)
- Tax calculation (corporate tax rate applied to taxable income)
- Credits and estimated tax payments already made
- Balance due or refund amount
Quick example
A German founder starts a US LLC in Wyoming to sell digital services to US clients. Annual gross income is $80,000. Operating expenses (software, contractor fees, accounting) total $20,000. Taxable income is therefore $60,000. The founder elects corporate taxation to simplify personal liability separation. Form 1120 will report this $60,000 and calculate federal corporate income tax on it. The form is due April 15 of the following year.
How this fits your US business journey
Registering a US LLC with an EIN is the first step; Form 1120 is what you file annually after that. Most non-US founders use a tax professional or a service like Founders Credit to handle the filing correctly, because the rules differ depending on whether your LLC is a single-member or multi-member entity, whether it's electing corporate status, and whether Form 5472 is triggered. Accurate Form 1120 filings also support your application for a US business bank account and business credit cards, since lenders and platforms want to see clean tax compliance.
Form 1120 vs. other forms for non-US founders
| Form | Used by | Filed at |
|---|---|---|
| Form 1120 | C corporations and LLCs taxed as corporations | IRS, April 15 |
| Form 5472 | Foreign-owned entities required to report transactions with foreign parent | IRS, with Form 1120 |
| Schedule C (Form 1040) | Sole proprietors and disregarded single-member LLCs | IRS, personal return |
| Form 1065 | Partnerships and multi-member LLCs | IRS, April 15 |
Founders Credit specializes in helping European entrepreneurs file Form 1120 correctly and on time, integrating it into your overall US tax and compliance strategy. We handle the complexity so you can focus on your business.
Frequently asked questions
Do I have to file Form 1120 if my US LLC made no money?
If your LLC is taxed as a corporation or if Form 5472 applies, yes. Filing Form 5472 at zero income is mandatory and avoids the $25,000 penalty.
Can I file Form 1120 myself?
You can, but errors are costly. A US tax professional or service like Founders Credit ensures compliance and identifies available deductions.
What happens if I miss the Form 1120 deadline?
The IRS charges penalties and interest. You can request an automatic extension (Form 7004) by April 15 to extend the deadline by six months.
Does Form 1120 determine how much personal income tax I owe?
Form 1120 calculates corporate tax only. If your corporation distributes dividends, you report those separately on your personal return and may owe additional tax.
Is Form 1120 the same for all US LLCs?
No. It depends on your LLC tax election. Multi-member LLCs typically file Form 1065 instead. Disregarded single-member LLCs may file Schedule C on your personal return, not Form 1120.
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