A US LLC is tax-efficient for non-residents — but only if you stay compliant. Missing an IRS filing deadline triggers penalties that can run into the tens of thousands of dollars per form. This calendar lays out every deadline that actually applies to a non-US owner of a US LLC, with the forms involved and the extension options.
Quick Reference: Key Dates for 2026
| Date | Filing | Who |
|---|---|---|
| March 16, 2026 | Form 1065 (Partnership return) + Schedule K-1 | Multi-member LLCs |
| March 16, 2026 | Form 7004 (extension to Sept 15) | Multi-member LLCs |
| April 15, 2026 | Form 5472 + pro forma 1120 | Foreign-owned single-member LLCs |
| April 15, 2026 | Form 1040-NR | Non-residents with US-source income |
| April 15, 2026 | Form 4868 (extension for 1040-NR) | Non-residents |
| September 15, 2026 | Extended Form 1065 deadline | Multi-member LLCs on extension |
| October 15, 2026 | Extended Form 1040-NR deadline | Non-residents on extension |
| Various (state) | Annual reports + franchise tax | Varies by state |
Note: March 15 falls on a Sunday in 2026, so the deadline shifts to Monday March 16.
Your LLC Type Determines Your Filing Obligations
Before anything else, identify what kind of LLC you own — because each type files differently.
Single-Member LLC with Foreign Owner
By default, the IRS treats a single-member LLC (SMLLC) as a disregarded entity — meaning the LLC itself doesn't file a tax return. The owner is supposed to file as if the LLC didn't exist.
But for foreign-owned disregarded SMLLCs, the IRS added a specific reporting requirement in 2017: Form 5472 + pro forma Form 1120.
- Deadline: April 15, 2026 (for calendar year 2025)
- Purpose: informational only — no tax due if there's no US-source income
- Penalty for missing it: $25,000 per form, per year
This is the filing most non-resident LLC owners need. It's routine but cannot be skipped.
Multi-Member LLC (Partnership Taxation)
If your LLC has two or more members, it's taxed as a partnership by default. The LLC itself files Form 1065 (Partnership Return), and each member receives a Schedule K-1 showing their share of profits.
- Deadline for Form 1065 + K-1: March 16, 2026
- Extension available: Form 7004 — extends to September 15, 2026
- Penalty for late filing: $245 per partner, per month (up to 12 months)
A 2-member LLC filing 6 months late could face ~$3,000 in penalties. A 5-member LLC, ~$7,350. This is before any state penalties.
LLC Taxed as Corporation (Elected)
If you filed Form 8832 or Form 2553 to elect corporate or S-corp treatment, the LLC files Form 1120 (corporate) or Form 1120-S (S-corp).
- Form 1120 deadline: April 15, 2026
- Form 1120-S deadline: March 16, 2026
- Note: S-corp election is generally not available to non-residents, so this path applies mostly to LLCs owned by US persons.
Most non-resident-owned LLCs stay disregarded (SMLLC) or partnership (multi-member) — not corporate.
The Forms You Actually Need
Form 5472 + Pro Forma 1120 (for Foreign-Owned SMLLCs)
Required since 2017 for SMLLCs owned by non-US persons or foreign corporations. Reports reportable transactions between the LLC and its foreign owner (capital contributions, distributions, loans).
- Filing: paper or fax only (no e-filing allowed for 5472 attached to pro forma 1120)
- EIN required: yes — if your LLC doesn't have one yet, apply immediately
- Due date: April 15, 2026
Form 1065 (for Multi-Member LLCs)
The partnership return. Reports total income, deductions, and each partner's share.
- Filing: e-file or paper
- Schedule K-1 generated per partner
- Due date: March 16, 2026
Form 1040-NR (for Personal US-Source Income)
If you, as a non-resident, have effectively connected income (ECI) to the US — US-source business profits, US real estate rentals, US wages — you owe a personal return.
For most non-resident LLC owners serving non-US clients: not required. For owners with any US-source business activity: required.
- Due date: April 15, 2026
- Extension: Form 4868 → October 15, 2026
Form W-8BEN / W-8BEN-E (Ongoing, Not Annual)
Given to US payers (clients, banks, brokers) to certify your non-US status and claim any treaty benefits. Not filed with the IRS — filed with the payer. Usually valid for 3 years.
Extensions: How to Buy More Time
Extensions are available but require proactive filing before the original deadline:
- Form 7004 — LLC tax returns (1065, 1120). Extends deadline by 6 months automatically, no reason needed.
- Form 4868 — individual returns (1040-NR). Extends by 6 months.
Critical: an extension of filing time is not an extension of tax payment time. If you owe tax, you must estimate and pay by the original deadline or face late-payment penalties.
For most non-resident LLC owners with zero US tax owed, filing Form 7004 or 4868 is risk-free and buys you until September/October.
State Deadlines Matter Too
The IRS is federal. Your LLC's state has its own deadlines:
| State | Annual report | Franchise/state tax |
|---|---|---|
| Wyoming | Anniversary month | $60/year, no income tax |
| Delaware | June 1 | $300/year franchise |
| New Mexico | — (no annual report) | $50/year filing fee |
| Nevada | Anniversary month | $350/year + business license |
| Florida | May 1 | No state income tax |
Skipping state filings gets your LLC administratively dissolved. That's worse than federal penalties because it invalidates your entity — banks close your accounts, you lose your EIN's legal basis.
Common Mistakes Non-Resident Owners Make
1. Missing Form 5472 the First Year
New LLC owners often don't know about 5472 until tax season. By then, they've already missed the deadline. Plan this before year-end.
2. Assuming No Tax = No Filing
Zero US tax doesn't mean zero filing. Form 5472, Form 1065, state annual reports — all are required regardless of whether you owe a penny.
3. Not Getting an EIN Early
Form 5472 requires your LLC to have an EIN. Getting an EIN as a non-resident can take 4-8 weeks via mail/fax. Don't start the process in March.
4. Filing 5472 Without Pro Forma 1120
Form 5472 is always attached to a pro forma Form 1120 (mostly blank, just identifying the entity). Submitting 5472 alone is considered non-filing.
5. Ignoring State Deadlines
Your federal filings might be perfect, but skipping Delaware's $300 annual franchise tax gets your LLC dissolved.
How to Stay Ahead
- October each year: review your LLC structure, confirm EIN is active, pull last year's filings
- January: assemble K-1 data for multi-member LLCs, begin 1065 prep
- February: file Form 7004 if you need an extension — don't wait
- March 16: 1065 due (or extension filed)
- April 15: 5472 + 1120 due, 1040-NR if applicable
Next Steps
The non-resident US LLC regime is generous — but it's conditional on clean compliance. Missing one form can cost more than the entire year's savings. At Leasum, we handle annual IRS and state compliance for our LLC clients as a flat yearly service. If you're not 100% sure your filings are current, it's worth reviewing before the next deadline.
