Running a US LLC from Sri Lanka comes with one recurring headache, knowing exactly when the IRS expects a form from you. Deadlines change by entity type, shift when they land on a weekend, and carry different rules again when the owner isn’t a US taxpayer. This guide lays out every LLC tax deadline for 2026 and 2027 in one place, covering single-member LLCs, multi-member LLCs, S-corp and C-corp elections, extensions, and quarterly estimated payments.
Whether you’re catching up on a date you missed earlier this year or planning ahead for 2027, you’ll find the exact table that applies to your LLC below. We’ve also built in a section specifically for non-resident owners, since Form 5472, BOI reporting, and EIN timing work differently when you’re filing from outside the US.
Bookmark this page, check the full checklist near the end, and you’ll always know what’s due next.
What’s Still Due Before the End of 2026
If your March or April 2026 deadline is already behind you, two dates still matter this year.
- October 15, 2026 is the final deadline for single-member LLCs and C-corps that filed Form 4868 or Form 7004 for an extension. This is a hard stop, with no further extension past this date.
- January 15, 2027 is the due date for your fourth-quarter 2026 estimated tax payment. This applies if you expect to owe $1,000 or more in tax for the year and haven’t already covered it through prior payments.
If you missed the March 16 or April 15, 2026 filing deadline and haven’t filed yet, don’t wait for these two dates to catch up. Late filing penalties are already accruing, and they only grow the longer a return sits unfiled. See the penalties section below for what to do next.
Key LLC Tax Deadlines by Entity Type For Year 2026 & 2027
Your LLC’s deadline comes down to one thing: how it’s classified for tax purposes, not the fact that it’s an LLC. Here’s every deadline broken down by classification, with both years side by side.
1. Single-Member LLC (Schedule C)
A single-member LLC is treated as a disregarded entity by default. You report business income and expenses on Schedule C, filed with your personal Form 1040. There’s no separate business return.
| Tax Year | Filing Deadline |
| 2025 | April 15, 2026 |
| 2026 | April 15, 2027 |
You’ll also file Schedule SE to calculate self-employment tax on your net profit. If you need more time, file Form 4868 by the due date for an automatic six-month extension. The extension covers filing only, not payment.
2. Multi-Member LLC (Form 1065)
A multi-member LLC defaults to partnership taxation. The LLC files Form 1065, an information return, and issues Schedule K-1 to each member reporting their share of income.
| Tax Year | Filing Deadline |
| 2025 | March 16, 2026 |
| 2026 | March 15, 2027 |
(March 15, 2026 falls on a Sunday, so the deadline shifts to the next business day.)
The LLC itself doesn’t pay income tax. Members report their K-1 income on personal returns. Late filing carries a penalty of $235 to $255 per member per month, for up to 12 months, even if no tax is owed.
3. LLC Taxed as S-Corp (Form 1120-S)
An LLC that has elected S-corp status files Form 1120-S instead of Form 1065. It follows the same early deadline as a partnership, since members need their K-1s in time for their own returns.
| Tax Year | Filing Deadline |
| 2025 | March 16, 2026 |
| 2026 | March 15, 2027 |
The S-corp itself generally doesn’t pay entity-level income tax. Income passes through to members via Schedule K-1. Members who work in the business must also receive a reasonable salary through payroll, which brings its own separate deadlines.
4. LLC Taxed as C-Corp (Form 1120)
An LLC that elected C-corp status files Form 1120 and pays corporate income tax directly, at a flat 21% rate. This is different from the other entity types, which don’t pay tax at the business level.
| Tax Year | Filing Deadline |
| 2025 | April 15, 2026 |
| 2026 | April 15, 2027 |
There’s no Schedule K-1 here. Profits distributed to members as dividends are taxed again on their personal returns, which is the double taxation C-corp owners often try to plan around.
5. Extension Deadlines (Form 7004 / Form 4868)
An extension gives you more time to file, not more time to pay. Any tax owed is still due on the original deadline, regardless of entity type.
| Entity Type | 2026 Extension | 2027 Extension |
| Partnership / S-corp | September 15, 2026 | September 15, 2027 |
| Single-member LLC / C-corp | October 15, 2026 | October 15, 2027 |
Partnerships and corporations file Form 7004. Single-member LLC owners file Form 4868. Both are automatic and don’t require a reason. File by the original due date, not the extended one, to qualify.
6. Quarterly Estimated Tax Payments
LLC owners typically don’t have taxes withheld. So the IRS collects through quarterly estimated payments if you expect to owe $1,000 or more for the year ($500 for C-corps).
| Quarter | 2026 Due Date | 2027 Due Date |
| Q1 | April 15, 2026 | April 15, 2027 |
| Q2 | June 15, 2026 | June 15, 2027 |
| Q3 | September 15, 2026 | September 15, 2027 |
| Q4 | January 15, 2027 | January 15, 2028 |
Missing a quarterly payment can trigger an underpayment penalty even if your annual return is filed and paid on time.
Once you know which table applies to you, you’re set on the federal filing calendar. The rest of this guide covers what’s different for non-resident LLC owners. A few of these rules work differently when the owner isn’t a US taxpayer.
Not sure how your LLC is classified?
Read our single member vs multi member LLC comparisonbefore you check your dates.
Deadlines for Non-Resident LLC Owners (Sri Lanka Founders)
If you’re a Sri Lanka-based owner of a foreign-owned single-member US LLC, one form applies to you that most guides skip. It’s called Form 5472, filed together with a pro forma Form 1120.
| Requirement | 2025 Tax Year | 2026 Tax Year |
| Form 5472 + pro forma 1120 | April 15, 2026 | April 15, 2027 |
| Extended deadline | October 15, 2026 | October 15, 2027 |
This applies even if your LLC had zero revenue, as long as there were reportable transactions, including a simple capital contribution to fund the business. Missing it carries a $25,000 minimum penalty, with no cap. File Form 7004 by the original due date if you need the extension.
Before any of this, you need an EIN. Without an SSN or ITIN, you apply by fax or mail using Form SS-4, and processing can take four to eight weeks. So start well before the deadline.
Important Note:
As of FinCEN’s August 2026 final rule, US-formed LLCs, including yours, are exempt from Beneficial Ownership Information (BOI) reporting. If you formed your LLC in the US, you don’t need to file a BOI report.
Curious how your LLC income is taxed on the Sri Lankan side?
Read our US LLC tax guide for Sri Lankans.
State Annual Report and Franchise Tax Deadlines
Federal deadlines are only half the picture. Most states charge their own annual fee or franchise tax to keep your LLC in good standing, and these dates rarely match the IRS calendar.
| State | Requirement | Deadline |
| Delaware | Annual LLC tax, flat $300 | June 1 |
| Wyoming | Annual report | First day of your LLC’s formation anniversary month |
| California | Franchise tax, $800 minimum | April 15 |
| Texas | Franchise tax report (no state income tax) | May 15 |
| Florida | Annual report | May 1 |
Delaware and Wyoming are the two most common formation states for non-resident owners, mainly because neither charges state income tax and both keep paperwork simple. Delaware’s $300 tax applies whether or not your LLC made money that year. Wyoming’s annual report deadline depends on when your LLC was originally formed, so check your formation date rather than assuming a fixed calendar date.
Your LLC may also operate in more than one state. If you have a registered agent, a warehouse, or active business in California, Texas, or Florida, that state’s fee applies too. This comes on top of whatever you already owe Delaware or Wyoming.
Missing a state deadline doesn’t trigger an IRS penalty. But it can lead to late fees, loss of good standing, or eventual administrative dissolution by the state. These dates are set by each Secretary of State rather than the IRS. So, always make sure to confirm the current deadline and fee directly on that state’s website before relying on the numbers above.
Want every recurring obligation in one place, beyond the dates?
LLC Tax Deadline Table: Full Checklist (2026 & 2027)
Here’s every deadline from this guide in one place, so you can check your dates without scrolling back through each section.
| ✓ | Requirement | 2025 Tax Year (Filed 2026) | 2026 Tax Year (Filed 2027) |
| ☐ | Single-member LLC (Schedule C) | April 15, 2026 | April 15, 2027 |
| ☐ | Multi-member LLC (Form 1065) | March 16, 2026 | March 15, 2027 |
| ☐ | LLC taxed as S-corp (Form 1120-S) | March 16, 2026 | March 15, 2027 |
| ☐ | LLC taxed as C-corp (Form 1120) | April 15, 2026 | April 15, 2027 |
| ☐ | Extension: Partnership / S-corp | September 15, 2026 | September 15, 2027 |
| ☐ | Extension: Single-member LLC / C-corp | October 15, 2026 | October 15, 2027 |
| ☐ | Q1 estimated tax | April 15, 2026 | April 15, 2027 |
| ☐ | Q2 estimated tax | June 15, 2026 | June 15, 2027 |
| ☐ | Q3 estimated tax | September 15, 2026 | September 15, 2027 |
| ☐ | Q4 estimated tax | January 15, 2027 | January 15, 2028 |
| ☐ | Form 5472 + pro forma 1120 (foreign-owned LLC) | April 15, 2026 | April 15, 2027 |
| ☐ | Form 5472 extended deadline | October 15, 2026 | October 15, 2027 |
| ☐ | Delaware annual LLC tax | June 1, 2026 | June 1, 2027 |
| ☐ | Wyoming annual report | Your LLC’s anniversary month | Your LLC’s anniversary month |
| ☐ | California franchise tax | April 15, 2026 | April 15, 2027 |
| ☐ | Texas franchise tax report | May 15, 2026 | May 17, 2027 |
| ☐ | Florida annual report | May 1, 2026 | May 1, 2027 |
A few of these dates shift when they land on a weekend or federal holiday, which is already reflected in the table above. Tick off each row as you file it, and use this table as your one reference point going forward.
Ready to Stop Tracking These Dates on Your Own?
Between EIN processing, Form 5472, state annual reports, and quarterly estimates, one missed date can mean a $25,000 penalty even on an LLC with zero income. That’s a lot to track manually from Sri Lanka, especially when a US mail delay or a slow ITIN application can push your own timeline past the deadline before you even notice.
BR.LK handles this for over 5,000 Sri Lankan founders already. Beyond forming your US LLC in 24 to 48 hours, we act as your registered agent, file your annual reports and BOI updates when they apply, handle your EIN and ITIN applications, and manage your S-corp election if that’s the right structure for your business. You get a dashboard that tracks every filing in real time, with support in Sinhala and Tamil when you need it.
If you’d rather have someone flag these deadlines before they arrive than keep checking a checklist yourself, talk to our team and we’ll take your LLC’s compliance off your plate.
Prefer to chat first? Message us on WhatsApp at +94 77 789 5327.
Conclusion
Your LLC’s tax deadline was never really about being an LLC. It comes down to how the IRS classifies your business, single-member, multi-member, S-corp, or C-corp, and that classification decides every date in this guide. A single-member LLC and a C-corp both file by April 15, while a multi-member LLC or an S-corp election files a month earlier, on March 15 or 16.
For non-resident owners, one more layer sits on top of the federal calendar. Form 5472 follows the same deadline as your entity type, state fees run on their own separate schedule, and BOI reporting no longer applies to a US-formed LLC regardless of who owns it.
The most expensive mistake is assuming one deadline covers your whole LLC. Confirm your classification first, then check the specific table above for your entity type, and mark your state’s fee separately since it rarely lines up with the IRS date. Extensions buy you time to file, never time to pay, so any tax owed is still due on the original date either way.
Key Takeaways
- Your LLC tax deadline depends on how the IRS classifies your business, not on the fact that it’s an LLC.
- Single-member LLCs and C-corps file by April 15, while multi-member LLCs and S-corp elections file a month earlier, on March 15 or 16.
- March 15, 2026 falls on a Sunday, so that year’s partnership and S-corp deadline shifts to March 16, 2026.
- An extension only gives you more time to file, never more time to pay, so any tax owed is still due on the original deadline.
- Missing a partnership or S-corp deadline carries a penalty of $235 to $255 per member or shareholder per month, even if the LLC owes no tax.
- If your March or April 2026 deadline has already passed, October 15, 2026 and January 15, 2027 are the two dates still ahead of you this year.
- Foreign-owned single-member LLCs must file Form 5472 with a pro forma Form 1120, even with zero revenue, or risk a $25,000 minimum penalty.
- Applying for an EIN without an SSN or ITIN takes four to eight weeks by fax or mail, so non-resident owners should start well before the deadline.
- US-formed LLCs are now exempt from BOI reporting under FinCEN’s August 2026 final rule, regardless of whether the owner is a US person or a foreign person.
- State deadlines, such as Delaware’s June 1 annual tax or California’s April 15 franchise tax, run on their own schedule and don’t line up with federal due dates.
FAQs
Missing your LLC tax deadline triggers a failure-to-file penalty, and for partnerships or S-corps, this adds up to $235-$255 per member per month, even with zero tax owed. Interest and failure-to-pay penalties apply too if you owe tax. File as soon as possible, since penalties keep accruing the longer a return sits unfiled.
Yes, most LLCs must file even with zero income. A single-member LLC with no income or deductions can sometimes skip Schedule C, but partnerships and S-corps generally still need to file to report that there was no activity. Skipping this can risk penalties and affect your LLC’s good standing.
Yes, a foreign-owned single-member LLC must file Form 5472 with a pro forma Form 1120 by April 15, 2026, even with zero revenue. This applies whenever there’s a reportable transaction, including a simple capital contribution. Missing it carries a $25,000 minimum penalty, with no maximum cap.
No, US-formed LLCs no longer have to file a BOI report. FinCEN’s August 2026 final rule made this exemption permanent for all domestic entities and their beneficial owners, regardless of nationality. Only foreign-formed entities that register to do business in a US state still carry this requirement.
The penalty depends on your entity type. Sole proprietors and C-corps generally face 5% of unpaid tax per month, up to 25%. Partnerships and S-corps face a flat $235-$255 per member per month for up to 12 months, even if the LLC owes no tax at all.
Yes, every LLC type can request a six-month extension using Form 7004 or Form 4868. This only extends your time to file, not your time to pay. Any tax owed is still due on the original deadline, so pay your estimated liability then to avoid interest and penalties.