US Tax Extensions for Foreign-Owned Companies: How They Work
An extension gives you six more months to file, not to pay. Which returns can be extended, the original and extended deadlines, and the common mistakes non-residents make.
Your bank statements are late, you are still collecting receipts, or you only just discovered that your LLC has to file. A US tax extension can give you breathing room. But extensions have rules, and misunderstanding them is one of the most common reasons foreign owners end up with penalties.
What an extension does, and does not do
An extension gives you extra time to file your return, normally six months.
It does not give you extra time to pay. If your company owes tax, interest and late-payment penalties run from the original due date, even if the return is validly extended. For most foreign-owned single-member LLCs, no tax is due on the information return, so the extension simply moves the filing deadline. Corporations and partners with effectively connected income need to think about payment as well.
Which returns can be extended
| Return | Who files it | Original deadline (calendar year) | Extended deadline |
|---|---|---|---|
| Form 1065 (partnership) | Multi-member LLCs | March 15 | September 15 |
| Form 1120 + Form 5472 (pro forma) | Foreign-owned single-member LLCs | April 15 | October 15 |
| Form 1120 | Corporations (C-Corps) | April 15 | October 15 |
| Form 1040-NR (no US wages) | Non-resident individuals | June 15 | December 15 |
| Form 1040-NR (with US wages) | Non-resident individuals with wages | April 15 | October 15 |
When a deadline falls on a weekend or US federal holiday, it moves to the next business day. See our 2027 tax deadline calendar.
The rule that matters most
An extension must be requested by the original deadline. A request made after the deadline is not valid, and late-filing penalties apply from the original date. For foreign-owned LLCs, that means the full $25,000 Form 5472 penalty can apply if neither the return nor a valid extension was filed in time. See the $25,000 penalty.
Is the extension automatic?
For business returns, the extension is generally granted automatically when requested correctly and on time; you do not need to give a reason. The request must be made for the right entity, under the right EIN, with the right return type.
Common mistakes
- Thinking the extension also extends payment. It does not.
- Requesting it late. It has to be in before the original deadline.
- Extending the wrong return, for example requesting an extension for a partnership return when the LLC is a disregarded entity that files a pro forma 1120.
- Treating the extended deadline as flexible. It is final. There is no second extension.
- Forgetting state returns. Some states have their own extension rules, though many follow the federal extension.
When an extension makes sense
- You are still waiting for bank statements, platform reports or invoices.
- The company changed structure or ownership during the year.
- You discovered the filing requirement close to the deadline.
- There are questions about effectively connected income that need careful review.
When it does not
If you have everything ready, filing on time is simpler. And if you owe tax, an extension does not help with the payment deadline.
How we handle extensions for clients
For our tax filing clients, we track every deadline. If your documents are not ready by early March (or early February for partnerships), we file the extension on time and complete your return well before the extended deadline. You never have to worry about the cut-off.
Our tax filing checklist shows what to collect so extensions are rarely needed.
How UCB helps
Our US tax filing service ($300 per year) includes deadline tracking, extensions when needed, and preparation and filing of Form 5472 with the pro forma 1120 for foreign-owned LLCs. We also prepare partnership and corporate returns.
See the US tax filing service.
Deadline coming up and not ready? WhatsApp us at +91 8105 199 399 or email info@ucbsolutions.com now, and we will file your extension in time.
Let our experts handle it for you
Every business is different. Message us with your country, business type and goals, and we will recommend the right structure, state and package. We do the work; you focus on your business.
This article is general information for non-resident business owners and is not legal or tax advice. Rules and fees change; contact us to confirm what applies to your situation.
