If your US LLC has two or more owners, the IRS taxes it as a partnership by default — and that means filing Form 1065 every year, regardless of whether the LLC made money. Skipping it is expensive: $245 per partner, per month late, capped at 12 months.
This article explains what Form 1065 actually does, what Schedule K-1 is, and what non-resident partners specifically need to know.
What Is Form 1065?
Form 1065, officially the "U.S. Return of Partnership Income", is the annual federal tax return for partnerships — including multi-member LLCs that haven't elected corporate taxation.
It reports:
- Total partnership income (revenue - expenses)
- Deductions, credits, and other tax items
- Each partner's share of the above
Importantly, the partnership itself does not pay federal income tax. It's a pass-through entity: profits and losses flow to the partners, who report them on their individual returns (1040 or 1040-NR).
Form 1065 is informational at the partnership level — but it's still mandatory.
When Is It Due?
The standard deadline is the 15th day of the 3rd month after the end of the tax year.
- Calendar year LLC: March 15 (March 16 in 2026 since the 15th is a Sunday)
- Fiscal year LLC: 15th day of the 3rd month after fiscal year end
Extension: file Form 7004 by the original deadline for an automatic 6-month extension (September 15 for calendar year filers).
Schedule K-1: The Partner's Copy
Along with Form 1065, the partnership issues a Schedule K-1 to each partner. The K-1 shows that partner's share of partnership income, deductions, and credits — the numbers they'll report on their personal tax return.
Each partner gets:
- Line 1: Ordinary business income (loss)
- Line 5-7: Interest, dividends, royalties
- Line 8-10: Capital gains
- Line 16: Foreign transactions (relevant for non-residents)
- Box L: Partner's capital account
The K-1 must be provided to each partner by the 1065 due date. Partners then use it to file their personal returns.
What Multi-Member LLCs With Non-Resident Partners Need to Know
1. Withholding on Foreign Partners
If the partnership has effectively connected income (ECI) to the US, the partnership must withhold US tax on foreign partners' shares. This is governed by Section 1446 of the Internal Revenue Code.
- Current rate: 37% for individuals, 21% for corporations (on ECI allocated to foreign partners)
- Quarterly estimated payments required
- Reported on Form 8804 (annual withholding) and Form 8805 (partner-specific withholding certificate)
If the LLC has no US-source ECI — for example, a pure consulting business serving non-US clients with no US operations — there's nothing to withhold. But the filing obligations for Form 1065 still apply.
2. Form 8804 / 8805 Additional Filings
If withholding applies, add:
- Form 8804: annual summary of partnership withholding on foreign partners
- Form 8805: partner's certification showing what was withheld on their behalf
- Form 8813: quarterly estimated withholding payments
Deadline for 8804/8805: same as Form 1065 (March 15 / September 15 extended).
3. The Foreign Partner's Personal Return
Each foreign partner with ECI allocated to them generally needs to file a personal US return — Form 1040-NR — to report the income and claim credit for any withholding already done by the partnership.
If ECI is zero, there's typically no personal US filing obligation for a non-resident partner.
Step-by-Step: What a Typical Year Looks Like
Here's the flow for a calendar-year multi-member LLC with non-resident partners, no US-source ECI:
Throughout the year
- Keep books: invoices, receipts, bank statements
- Track partner contributions and distributions
- Maintain capital account records
Early January
- Close the prior year's books
- Calculate each partner's allocable share
- Prepare draft P&L and balance sheet
February
- Prepare Form 1065
- Draft K-1s for each partner
- Verify each partner's capital account reconciles
March 16, 2026 (deadline)
- File Form 1065 with IRS (e-file preferred)
- Distribute K-1s to all partners
- If not ready: file Form 7004 for 6-month extension
September 15, 2026 (extended deadline)
- Final deadline if extension was filed
- No further extension available
Individual partners
- Use K-1 to complete 1040-NR (if applicable) by April 15 / October 15 extended
Common Mistakes
1. Skipping Form 1065 Because "There Was No Profit"
Form 1065 is required regardless of whether the LLC made a profit or loss. Even a dormant multi-member LLC with $0 revenue must file.
2. Late K-1 Delivery
Partners need their K-1s in time to file their own returns. Delivering K-1s in late March gives personal filers less than 3 weeks — file the 1065 extension and K-1s will be later, but partners can extend too.
3. Foreign Partner Withholding Errors
If the LLC has any US-source income allocated to foreign partners, withholding is mandatory. Missing 1446 withholding = personal liability for the partnership managers.
4. Incorrect Partnership Percentages
K-1 allocations must match the operating agreement. Ad-hoc changes without proper documentation trigger audit risk.
5. Not Maintaining Capital Accounts
The IRS now requires tax basis capital accounts on K-1s. Retroactively reconstructing these is painful — maintain them throughout the year.
Penalties to Know
| Failure | Penalty |
|---|---|
| Late Form 1065 filing | $245 × partners × months (max 12) |
| Late/missing K-1 to partner | $310 per K-1 |
| Missing 1446 withholding | Tax + interest + possible penalties up to 100% |
| Late Form 8804 | Up to $565 per partner, per form |
A 3-member LLC filing 6 months late without extension: 3 × 6 × $245 = $4,410 — plus potential K-1 penalties if those were also late.
When to Convert to Single-Member Structure
If all partners but one agree to exit, the LLC can become a single-member LLC (SMLLC) — a disregarded entity. Filing changes:
- No more Form 1065
- No more K-1s
- Just Form 5472 + pro forma 1120 (for foreign-owned SMLLC)
This simpler filing path is often preferable for non-resident owners running solo. But partnerships have their own advantages — income splitting, liability structuring, and broader banking access.
Next Steps
Form 1065 isn't complicated, but it's unforgiving of mistakes. Late K-1s irritate your partners. Missed 1446 withholding creates personal liability. Dormant LLCs still file.
At Leasum, we handle Form 1065 + K-1s for multi-member LLC clients annually, including foreign-partner withholding setup if applicable. If you're running a multi-member LLC with at least one non-resident partner, the compliance stack is worth getting right from day one.
