A foreign partnership must meet U.S. filing requirements whenever it earns income from U.S. sources or conducts business inside the country, and separate obligations fall on any U.S. person who holds an interest in one. The core filings are Form 1065 for the partnership itself, Forms 8804/8805/8813 for withholding on foreign partners, and Form 8865 for U.S. persons reporting their interest. Penalties start at $255 per partner per month for a late Form 1065 and climb to $10,000 per year (and more) for unreported foreign partnership interests.
When Form 1065 Is Required
A foreign partnership — one created or organized outside the United States — generally has no U.S. return obligation until it develops a financial connection to the country. Under 26 U.S.C. § 6031(e), the partnership must file Form 1065 for any tax year in which it has gross income from U.S. sources (such as interest, dividends, rents, or royalties paid by U.S. entities) or gross income effectively connected with a U.S. trade or business.1Office of the Law Revision Counsel. 26 U.S. Code 6031 – Return of Partnership Income The two categories are not the same thing. U.S.-source income is defined by where the payment originates, regardless of where the partnership operates. Effectively connected income is tied to the partnership actually doing business in the country.
Form 1065 is an information return. The partnership reports its income, deductions, and each partner’s distributive share, but the entity itself does not pay income tax on that income. Instead, income flows through to the partners, who report it on their own returns. The partnership issues each partner a Schedule K-1 showing that partner’s allocation of income, losses, deductions, and credits.2Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income Before it can file, the partnership needs an Employer Identification Number from the IRS and a complete record of every partner’s name, address, and taxpayer identification number.
Withholding on Foreign Partners’ Shares
When a partnership earns income effectively connected with a U.S. trade or business and any share of that income is allocable to a foreign partner, the partnership must withhold and remit tax on that share.3Office of the Law Revision Counsel. 26 U.S. Code 1446 – Withholding of Tax on Foreign Partners Share of Effectively Connected Income The partnership is the withholding agent, and the duty applies even when no cash actually leaves the partnership during the year.
The rate depends on the partner’s classification. Noncorporate foreign partners are withheld at 37%. Corporate foreign partners are withheld at 21%.4Internal Revenue Service. Who Must Withhold on Partnership Withholding Those rates can drop if a partner supplies documentation supporting a lower rate on particular income — typically Form W-8BEN-E for entities or Form W-8BEN for individuals.5Internal Revenue Service. Instructions for Form W-8BEN-E
The partnership reports total Section 1446 liability on Form 8804 and attaches a Form 8805 for each foreign partner, showing the effectively connected income allocated and the tax withheld.6Internal Revenue Service. Partnership Withholding Each foreign partner gets a copy of Form 8805, even when no tax was withheld. Quarterly installments are paid using Form 8813, due on the 15th day of the 4th, 6th, 9th, and 12th months of the partnership’s tax year.7Internal Revenue Service. About Form 8813, Partnership Withholding Tax Payment Voucher (Section 1446) Miss a quarterly deadline and interest accrues on the shortfall. Amounts withheld are credited against each foreign partner’s eventual U.S. income tax liability.
Withholding on Transfers of Partnership Interests
When a foreign person sells or otherwise transfers an interest in a partnership that conducts a U.S. trade or business, the buyer generally must withhold 10% of the amount realized.8eCFR. 26 CFR 1.1446(f)-2 – Withholding on the Transfer of a Non-Publicly Traded Partnership Interest Section 1446(f) exists to catch gains that would otherwise leave the U.S. tax system when a foreign partner exits. The buyer reports the withholding on Form 8288 and sends Form 8288-A to the IRS and the seller.9Internal Revenue Service. About Form 8288, U.S. Withholding Tax Return for Certain Dispositions by Foreign Persons
Exceptions do exist. The most common one applies when the seller provides a signed affidavit certifying they are not a foreign person, with their taxpayer identification number. If the buyer has no reason to doubt the affidavit, the withholding obligation falls away. Other exceptions cover cases where the partnership certifies that a sale would produce no effectively connected gain, or where the IRS approves a reduced amount. If the buyer fails to withhold, the partnership itself becomes liable to deduct the shortfall from future distributions to that buyer.
Form 8865 for U.S. Persons Holding Interests
Filing runs both ways. U.S. citizens, U.S. residents, and domestic entities that hold interests in foreign partnerships file Form 8865, which is organized into four categories that reflect the type and level of involvement.10Internal Revenue Service. About Form 8865, Return of U.S. Persons With Respect to Certain Foreign Partnerships
Categories 1 and 2: Control and Significant Ownership
Category 1 covers a U.S. person who controlled the foreign partnership at any point in the tax year, meaning ownership of more than 50% of the partnership’s capital, profits, or deductions. Category 2 covers a U.S. person who owned at least 10% of a foreign partnership that was itself controlled by U.S. persons collectively holding more than 50%.11Office of the Law Revision Counsel. 26 U.S. Code 6038 – Information Reporting With Respect to Certain Foreign Corporations and Partnerships Both require detailed disclosures about the partnership’s income, assets, and transactions.
Category 3: Property Contributions
Category 3 applies when a U.S. person contributes property to a foreign partnership in exchange for an interest, and either owns at least a 10% interest immediately after the contribution or contributed (together with related parties) more than $100,000 in property value during the surrounding 12-month period.12Internal Revenue Service. Instructions for Form 8865 (2025)
Category 4: Changes in Ownership
Category 4 catches U.S. persons who cross certain ownership thresholds. A reportable event happens when an acquisition takes a person from below 10% to 10% or more, when an interest increases or decreases by at least 10 percentage points from the last reporting, or when a disposition brings a person below 10%.12Internal Revenue Service. Instructions for Form 8865 (2025)
Schedules K-2 and K-3
Partnerships with items of international tax relevance file Schedule K-2 with the partnership return and issue Schedule K-3 to each partner. These schedules separate out the international components partners need to compute their foreign tax credits, treaty benefits, and other cross-border items.13Internal Revenue Service. Partnership Instructions for Schedules K-2 and K-3 (Form 1065) A foreign partnership with U.S.-source or effectively connected income will almost always need both.
FBAR and Form 8938 for U.S. Partners
Reporting can extend beyond Form 8865. If the foreign partnership holds financial accounts outside the United States and a U.S. partner has a financial interest in or signature authority over those accounts, that partner must file FinCEN Form 114 (the FBAR) when the aggregate value of all foreign financial accounts exceeds $10,000 at any point during the calendar year.14Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements
Form 8938 (Statement of Specified Foreign Financial Assets) is separate. For an unmarried individual living in the United States, the threshold is $50,000 on the last day of the year or $75,000 at any point during the year.15Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets Thresholds are higher for joint filers and taxpayers living abroad. Form 8938 does not replace the FBAR; many taxpayers file both.14Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements
Deadlines and Extensions
A domestic partnership files Form 1065 by the 15th day of the third month after its tax year ends, which is March 15 for calendar-year filers.16Internal Revenue Service. Starting or Ending a Business 3 A foreign partnership filing Form 1065 follows a deadline that depends on whether it maintains an office or place of business in the United States, so check the current-year Form 1065 instructions for the exact date that applies.
Any partnership can file Form 7004 for an automatic six-month extension.17Internal Revenue Service. About Form 7004, Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns The extension gives more time to file, not more time to pay. Section 1446 withholding still follows its quarterly schedule, and any estimated tax owed is due on the original date. Form 8804 is due on or before the 15th day of the third month after the partnership’s tax year ends, and it too can be extended, with the same catch: pay by the original deadline.
Penalties
For Form 1065 returns due in 2026, filing late or filing incomplete costs the partnership $255 per partner per month or partial month, up to 12 months.18Internal Revenue Service. Failure to File Penalty A 10-partner partnership six months late owes $15,300. The penalty is assessed against the partnership, and reasonable cause is the only defense.19Office of the Law Revision Counsel. 26 U.S. Code 6698 – Failure to File Partnership Return
A U.S. person who fails to file Form 8865 as a Category 1 or Category 2 filer owes $10,000 per annual accounting period. If the IRS sends a notice and the person still does not file within 90 days, an additional $10,000 accrues for each 30-day period of continued noncompliance, up to $50,000 more.11Office of the Law Revision Counsel. 26 U.S. Code 6038 – Information Reporting With Respect to Certain Foreign Corporations and Partnerships Total exposure for a single missed year can reach $60,000. A Category 3 filer who fails to report a property contribution owes 10% of the property’s fair market value at transfer, capped at $100,000 per transfer unless the IRS shows the failure was intentional, in which case the cap disappears.20GovInfo. 26 U.S.C. 6038B – Notice of Certain Transfers to Foreign Persons
A partnership that fails to withhold and remit under Section 1446 is liable for the full amount that should have been withheld, plus interest from the original due date. Failure-to-deposit and failure-to-pay penalties can stack on top, and the IRS can collect from the partnership and its responsible persons. Reasonable cause is available across most of these penalty provisions, but the IRS reads it narrowly in the international context. Not knowing about a requirement is rarely enough.
Partnership Representative
Under the Bipartisan Budget Act of 2015, the IRS audits partnerships — including foreign ones — at the entity level. Every partnership in this regime must designate a partnership representative with sole authority to act for the partnership during an audit.21Internal Revenue Service. BBA Centralized Partnership Audit Regime The representative does not need to be a partner but must have a substantial presence in the United States. Smaller partnerships may elect out on a timely filed return if they meet the eligibility rules.