What is Form 8865?

How it works

Form 8865 mirrors Form 5471 but for partnerships. It's filed annually with the US partner's tax return (Form 1040 for individuals, 1065 for partnerships, 1120 for corporations). Four categories of filer trigger it:

• Category 1: US persons who controlled (>50% interest) a foreign partnership at any time during the year.
• Category 2: US persons who owned at least 10% interest while the partnership was controlled by US persons each holding 10%+.
• Category 3: US persons who contributed property of $100,000+ value (or whose contribution took aggregate contributed property to >10% of the partnership) during the year.
• Category 4: US persons whose interest crosses certain reporting thresholds during the year — acquisition, disposition, or proportional change.

Each category requires a different bundle. Category 1 attaches the most: full income statement (Schedule K), partner shares (K-1), balance sheet (L), capital reconciliation (M-1, M-2), and transactions with partners (N). Category 3 attaches Schedule O for the contribution detail.

Examples

• US LLC partner in a Singapore LLP. A US-owned Delaware LLC holds 40% of a Singapore Limited Liability Partnership; two Singapore residents hold 30% each. The Delaware LLC files Form 8865 as Category 2: US persons collectively control the partnership when traced through to the US owner, and the Delaware LLC alone holds 10%+. A partial Schedule K-1 from Singapore feeds through to the US owner's Schedule E each year.
• Property contribution to a UK LLP. A US founder contributes $250,000 of intellectual property to a new UK LLP in exchange for 25% interest. The contribution alone triggers Category 3; she files Form 8865 with Schedule O detailing the property's basis, fair market value, and the partnership's allocations on the contribution.

Common mistakes

• Treating "LLP" as a corporation. Most foreign LLPs default to partnership classification under the check-the-box rules — UK LLPs, Singapore LLPs, German GmbH & Co. KG, etc. Form 8865 applies, not Form 5471. Mis-classifying the entity means filing the wrong form, which the IRS treats as failure to file the right one.
• Skipping it because the partnership has no US-source income. Like 5471 and 5472, this is an information return — independent of income source.
• Forgetting Category 3 on contributions. Category 3 triggers on a single act of property contribution. A one-off transaction at the start of the year is easily overlooked the following spring at filing.
• Missing the dual-status arrival year. New US tax residents with pre-existing foreign partnership interests routinely miss the first 8865 of their first US tax year — the form is owed for the resident portion of the year.