IRS Form 1065 — U.S. Return of Partnership Income

What is Form 1065?

Form 1065 (U.S. Return of Partnership Income) is the annual information return filed by partnerships, multi-member LLCs taxed as partnerships, and certain other pass-through entities. The partnership itself does not pay federal income tax — instead, income, deductions, credits, and other tax items flow through to partners via Schedule K-1 (Form 1065). Practitioners who handle partnership clients must understand both the entity-level Form 1065 and the partner-level Schedule K-1 reporting.

Who Must File Form 1065?

The following entities must file Form 1065:

• General partnerships
• Limited partnerships (LPs)
• Limited liability partnerships (LLPs)
• Multi-member LLCs (unless elected to be taxed as a corporation)
• Foreign partnerships with US income or US partners
• Certain investment clubs and joint ventures

Exception: Single-member LLCs are disregarded entities and do not file Form 1065 (they file Schedule C or are included in the owner's return).

Form 1065 Due Date

Form 1065 is due on the 15th day of the 3rd month after the tax year ends — March 15 for calendar-year partnerships. A 6-month extension (to September 15) is available by filing Form 7004. This is earlier than the individual return deadline (April 15), which is intentional — partners need their K-1s to complete their own returns.

Practitioner note: Late filing of Form 1065 triggers a penalty of $245 per partner per month (up to 12 months) for 2026. A 10-partner LLC that files 3 months late faces a penalty of $7,350. File Form 7004 proactively if the return cannot be completed by March 15.

Key Schedules and Attachments

Partnership Basis — The Critical Planning Issue

Partnership basis is one of the most complex and consequential areas of partnership taxation. A partner's outside basis determines:

• Whether losses can be deducted currently (basis limitation under §704(d))
• The tax consequences of distributions (taxable if distributions exceed basis)
• The gain or loss on sale of the partnership interest

Outside basis increases: Capital contributions, share of partnership income, share of partnership liabilities (recourse and nonrecourse)

Outside basis decreases: Distributions, share of partnership losses, share of partnership deductions

Self-Employment Tax and Partnerships

General partners pay self-employment tax on their distributive share of partnership ordinary income. Limited partners generally do not pay SE tax on their distributive share (only on guaranteed payments). For multi-member LLCs, the SE tax treatment depends on the member's level of participation and whether they are treated as general or limited partners for SE tax purposes — an area of ongoing IRS guidance and litigation.

The §754 Election — Step-Up in Basis

A partnership can make a §754 election to adjust the inside basis of partnership assets when a partner sells their interest or when a partner dies. This election prevents the "phantom income" problem where a new partner pays tax on pre-existing built-in gains. The election is made on the partnership return and applies to all future transfers until revoked.

Guaranteed Payments

Guaranteed payments (§707(c)) are payments to partners for services or capital that are determined without regard to partnership income. They are deductible by the partnership and taxable to the receiving partner as ordinary income (subject to SE tax for general partners). Guaranteed payments must be reported on Schedule K-1 Box 4 and are not subject to the basis limitation rules.

Form 1065 — U.S. Return of Partnership Income

Form 1065 is the annual information return filed by partnerships, multi-member LLCs taxed as partnerships, and certain other entities. Unlike corporate returns, Form 1065 is an information return — the partnership itself pays no federal income tax. Instead, income, deductions, credits, and other tax items flow through to the partners via Schedule K-1, and each partner reports their share on their individual return.

Who Must File Form 1065

Form 1065 must be filed by:

• Every domestic partnership (general, limited, LLP)
• Every multi-member LLC that has not elected to be taxed as a corporation
• Foreign partnerships with US-source income or US partners
• Certain investment clubs and joint ventures

Exception: A two-member LLC where both members are spouses and the LLC is in a community property state can elect to be treated as a "qualified joint venture" — filing two Schedule Cs instead of Form 1065. This simplifies compliance significantly for spousal businesses.

Form 1065 Due Date

Form 1065 is due on March 15 (for calendar-year partnerships) — one month before individual returns. This early deadline ensures partners receive their Schedule K-1s in time to complete their personal returns by April 15. A 6-month extension (to September 15) is available by filing Form 7004. The extension applies to the return itself — not to any tax owed by the partners.

Key Sections of Form 1065

Schedule K — Separately Stated Items

Schedule K is the heart of Form 1065. It lists all items that must be separately stated and allocated to partners because their tax treatment depends on each partner's individual circumstances. Key separately stated items:

• Net rental real estate income/loss (§469 passive activity rules apply)
• Other net rental income/loss
• Guaranteed payments to partners
• Interest income
• Ordinary dividends and qualified dividends
• Royalties
• Net short-term and long-term capital gains/losses
• §1231 gains/losses
• §179 deduction
• Charitable contributions
• Investment interest expense
• Self-employment earnings (for general partners)
• Credits (§45B tip credit, WOTC, etc.)

Partner Capital Accounts — Tax vs. Book

Form 1065 requires reporting partner capital accounts. For tax years beginning in 2020 and later, the IRS requires capital accounts to be reported on the tax basis method (not GAAP or §704(b) book value). Tax basis capital accounts reflect each partner's adjusted basis in their partnership interest — a critical number for loss limitation and distribution planning.

Guaranteed Payments on Form 1065

Guaranteed payments to partners are deducted on Line 10 of Form 1065 (reducing ordinary income) and reported on Schedule K, Line 4. Each partner receiving guaranteed payments has them reported on their Schedule K-1, Box 4. Guaranteed payments are subject to SE tax for the receiving partner and are includible in ordinary income.

Form 1065 Penalties

The penalty for late filing of Form 1065 is $245 per partner per month (up to 12 months) for returns due after December 31, 2022. For a 10-partner LLC that files 3 months late, the penalty is $7,350. The penalty can be abated for reasonable cause or under the First-Time Abatement policy.

BBA Centralized Partnership Audit Regime

Since 2018, most partnerships are subject to the Bipartisan Budget Act (BBA) centralized audit regime. Under BBA, the IRS audits the partnership at the entity level and assesses any resulting tax against the partnership (not the individual partners). Partnerships can elect out of BBA if they have 100 or fewer eligible partners and file a timely election. Practitioners should evaluate the BBA election for each partnership client — it can significantly affect audit risk and tax liability.

Form 1065: Complete Practitioner Guide for Partnership Tax Returns

Form 1065 (U.S. Return of Partnership Income) is the annual information return filed by partnerships, multi-member LLCs taxed as partnerships, and certain other entities. While the partnership itself pays no federal income tax, Form 1065 is a critical compliance document — it reports the partnership's income, deductions, credits, and other tax items, and generates the Schedule K-1s that partners use to report their distributive shares on their individual returns.

Who Must File Form 1065

Every domestic partnership that receives income, incurs losses, or has deductions or credits must file Form 1065. This includes general partnerships, limited partnerships, limited liability partnerships (LLPs), and multi-member LLCs that have not elected to be taxed as a corporation. Single-member LLCs are disregarded entities and do not file Form 1065 (their income is reported on Schedule C or Schedule E of the owner's return).

Foreign partnerships with U.S. source income or U.S. partners must also file Form 1065 (or Form 1065-B for electing large partnerships). Certain small partnerships (10 or fewer partners, all of whom are U.S. citizens or resident aliens, with simple income items) may be eligible for simplified reporting under the "small partnership" exception.

Due Date and Extensions

Form 1065 is due on the 15th day of the 3rd month after the close of the partnership's tax year — March 15 for calendar-year partnerships. An automatic 6-month extension is available by filing Form 7004, extending the due date to September 15. The extension is for filing only — partnerships do not pay tax, so there is no payment due with the extension.

Important: The March 15 due date for partnerships is earlier than the April 15 due date for individual returns. This is intentional — partners need their K-1s to prepare their individual returns. Practitioners must plan their workflow to complete partnership returns before the March 15 deadline to avoid cascading extension requests for partners.

Schedule K: Partners' Distributive Shares

Schedule K is the heart of Form 1065 — it summarizes the total amounts of each income, deduction, credit, and other tax item that will be allocated to partners on their Schedule K-1s. The key Schedule K items: ordinary business income or loss (line 1), net rental real estate income or loss (line 2), other net rental income or loss (line 3), guaranteed payments (line 4), interest income (line 5), dividends (line 6), royalties (line 7), net short-term capital gain or loss (line 8), net long-term capital gain or loss (line 9a), §1231 gain or loss (line 10), §179 deduction (line 12), other deductions (line 13), self-employment earnings (line 14), and credits (lines 15–16).

Schedule K-1: Allocating Items to Partners

Each partner receives a Schedule K-1 showing their share of each item from Schedule K. The allocation must be made in accordance with the partnership agreement — either pro-rata based on partnership interests or through special allocations that have substantial economic effect under §704(b). Practitioners must ensure that the K-1 allocations match the partnership agreement and that any special allocations are properly documented.

The K-1 also reports each partner's beginning and ending capital account balance, their share of partnership liabilities (recourse, qualified nonrecourse, and nonrecourse), and any other information needed to compute the partner's outside basis. Practitioners should reconcile the K-1 capital account to the partner's outside basis schedule — they are often different because outside basis includes the partner's share of partnership liabilities while the capital account typically does not.

The Centralized Partnership Audit Regime (BBA)

The Bipartisan Budget Act of 2015 (BBA) fundamentally changed how the IRS audits partnerships. Under the BBA centralized audit regime (effective for tax years beginning after December 31, 2017), the IRS audits the partnership at the entity level and assesses any resulting tax against the partnership itself — not against individual partners. The partnership pays the "imputed underpayment" at the highest individual or corporate rate (currently 37%).

Partnerships can elect out of the BBA regime if they have 100 or fewer eligible partners (individuals, C-Corps, S-Corps, estates of deceased partners, and certain foreign entities — but not partnerships, trusts, or disregarded entities). The election out must be made annually on a timely filed Form 1065. Practitioners should evaluate the BBA election for every eligible partnership — the election allows the IRS to assess tax against individual partners at their actual rates, which is almost always more favorable than the 37% partnership-level rate.