Last reviewed October 7, 2026 · By the NYBACS advisory team
Short answer
A US LLC files Form 1065 when it has two or more members and has not elected to be taxed as a corporation — the default partnership classification. The return is due by the 15th day of the third month after year-end (March 15 for calendar-year LLCs), issues a Schedule K-1 to each member, and must be filed unless the LLC had no income and no deductible expenses. Foreign members add withholding and extra reporting obligations.
Key takeaways
- Two or more members plus no corporate election equals a partnership, whatever the members' nationality or the state of formation.
- Form 1065 is due March 15 for a calendar-year LLC; Form 7004 extends the filing date by six months.
- The late-filing penalty is charged per member per month — $255 per partner per month for returns due after December 31, 2025, for up to 12 months.
- A partnership with effectively connected income allocable to a foreign member must generally pay Section 1446 withholding tax and file Forms 8804 and 8805, even if it distributes nothing.
- Every partnership subject to the centralized audit regime must designate a partnership representative with a substantial US presence.
Which LLCs fall into Form 1065
Form 1065 is the partnership return. An LLC becomes a partnership for tax purposes automatically when it has more than one member and does not file Form 8832 to be taxed as a corporation. Common foreign-owner examples include:
- two co-founders from different countries holding an LLC 50/50;
- a founder holding 90% personally and 10% through a holding company — two members, so a partnership;
- an overseas parent company and a local partner forming a US joint venture LLC.
Timing matters. If a single-member LLC admits a second member on, say, July 1, it is a disregarded entity for the first part of the year and a partnership from the admission date, with a Form 1065 covering the partnership period. The operating agreement and member register should record exactly when membership changed. Getting this date wrong usually means one of the two periods goes unreported.
Deadlines, extensions and the per-partner penalty
| Item | Rule for a calendar-year LLC |
|---|---|
| Form 1065 due date | March 15 (15th day of the 3rd month after year-end) |
| Extension | Form 7004 by March 15, extending filing to September 15 |
| Schedule K-1 to members | Furnished by the return due date, including extensions |
| Late filing penalty | A per-partner monthly amount ($255 for returns due after 2025), for up to 12 months |
| E-filing | Required if the partnership files 10 or more returns of any type in the year, or has more than 100 partners |
Because the penalty multiplies by the number of members, a three-member LLC filing several months late faces a penalty in the thousands of dollars even if it owes no tax. A partnership itself pays no federal income tax, so there is no tax-based ceiling on this penalty.
Foreign members trigger Section 1446 withholding
This is the issue most foreign-owned partnerships overlook. If the LLC carries on a US trade or business and has effectively connected taxable income allocable to a foreign member, the partnership must pay withholding tax on that member's share — whether or not any cash was distributed. The rate is tied to the highest US rate for the member type: currently 21% for a foreign corporate member and 37% for a foreign individual member.
The compliance package typically includes:
- Form 8813 — quarterly installment payments of the withholding tax during the year;
- Form 8804 — the annual partnership withholding return, due on the 15th day of the third month after year-end;
- Form 8805 — a statement to each foreign member showing the tax withheld on its behalf, which the member uses to claim credit on its own Form 1040-NR or Form 1120-F.
Foreign members also typically need their own US tax identification numbers. If the partnership's income is not effectively connected — for example, all services are performed outside the US — the withholding obligation may not arise, but that conclusion should be documented.
Other partnership-specific requirements
A few further points distinguish a partnership return from simpler filings:
- Schedules K-2 and K-3 report items of international tax relevance; partnerships with foreign members generally cannot rely on the domestic filing exception and should expect to complete them.
- Partnership representative. Under the centralized audit regime, the partnership designates a representative who must have a substantial presence in the US — a US address, phone number and taxpayer identification number. A foreign-only membership often appoints a US-based individual or entity for this role.
- Capital accounts. K-1s report each member's capital account, so contributions and distributions must be tracked by member, not just in total.
- State partnership filings. Many states require their own partnership return and may require tax to be withheld, or a composite return filed, for nonresident members. These state rules apply separately from Section 1446 and differ by state, so the states where the LLC operates should be mapped at the same time as the federal return.
Common mistakes to avoid
- Continuing to file a pro forma Form 1120 and Form 5472 after the LLC admitted a second member.
- Missing the March 15 partnership deadline by assuming it follows the April corporate date.
- Ignoring Section 1446 withholding because no cash was distributed to the foreign members.
- Designating a non-US member as partnership representative without the required US presence.
- Tracking capital only in total, leaving no basis for each member's K-1 capital account.
- Not issuing K-1s to members in time for their own US and home-country filings.
Documents and records to prepare
- Operating agreement, ownership percentages and dates of any membership changes
- Each member's name, address, country and US or foreign tax identification number
- Full-year books, bank statements and payment-processor reports
- Records of contributions and distributions by member
- Details of US activity: staff, office, inventory, where services were performed
- Prior-year Form 1065, K-1s and any Forms 8804/8805
NYBACS 360° support
How NYBACS helps
- Confirms from the operating agreement and EIN records whether, and from which date, your LLC is a partnership.
- Maintains member-level capital records so K-1 capital accounts reconcile to the books.
- Coordinates Form 1065, K-1s and, where needed, Schedules K-2/K-3 and Section 1446 forms with licensed tax professionals.
- Builds a calendar for the March 15 deadline, Form 8813 installments and any Form 7004 extension.
- Helps identify a suitable US-based partnership representative arrangement for foreign-only memberships.
Frequently Asked Questions
Can a partnership with foreign members file Form 1065 on paper?
Only if it is not required to e-file. Partnerships with more than 100 partners, or that file 10 or more returns of any type in the year (counting forms such as W-2s and 1099s), must generally file electronically unless a waiver applies.
Do the foreign members need to file their own US returns?
If the partnership has effectively connected income, each foreign member generally files a US return — Form 1040-NR for individuals or Form 1120-F for companies — and claims credit for the Section 1446 tax withheld. If there is no effectively connected income, that obligation may not arise.
Would electing C-Corp status avoid Form 1065?
Yes, a Form 8832 election makes the LLC file Form 1120 instead, but the company then pays corporate tax on its profits and distributions may be taxed again as dividends. Choose the classification for business and tax reasons, not to avoid a form.
What if the partnership made a loss?
It still files Form 1065. The loss is allocated to members on their K-1s, and accurate reporting matters because members may use the loss on their own returns where the rules allow.
