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Partnership Tax Filing Guide: Form 1065 and K-1 Deadlines

If you operate a multi-member LLC or a general partnership, the IRS considers your business a partnership by default. Partnerships do not pay federal income tax at the entity level. Instead, they file an informational return and pass income, deductions, and credits through to each partner. Understanding this process is essential because even though the partnership itself does not owe tax, missing the filing deadline triggers steep penalties.

How Partnerships Are Taxed

A partnership is a pass-through entity. The business itself does not pay federal income tax. Instead, each partner reports their share of the partnership's income or loss on their personal tax return (Form 1040). This applies equally to general partnerships, limited partnerships, and multi-member LLCs that have not elected corporate taxation.

The IRS treats any multi-member LLC as a partnership unless the LLC files Form 8832 (Entity Classification Election) to be taxed as a C-Corp or Form 2553 to elect S-Corp status. If you formed a two-member LLC and never filed either election, you are a partnership in the eyes of the IRS.

Form 1065: The Partnership Return

Every partnership must file Form 1065, U.S. Return of Partnership Income, each year. This form reports the partnership's total income, deductions, gains, losses, and credits. It is an informational return only — no tax is paid with it.

Key items reported on Form 1065 include:

• Gross receipts and cost of goods sold
• Ordinary business income or loss
• Guaranteed payments to partners
• Rental income, interest income, and capital gains
• Deductions for salaries, rent, depreciation, and other business expenses

The completed Form 1065 generates a Schedule K-1 (Form 1065) for each partner. The K-1 shows that partner's distributive share of income, deductions, and credits for the tax year.

Form 1065 Filing Deadline

For calendar-year partnerships, Form 1065 is due March 15. If March 15 falls on a weekend or federal holiday, the deadline shifts to the next business day.

If you need more time, file Form 7004 to request an automatic six-month extension, which pushes the deadline to September 15. However, the extension only grants additional time to file, not additional time for partners to pay any tax owed on their individual returns.

Schedule K-1 Distribution

Each partner must receive their Schedule K-1 by the 1065 deadline (March 15, or the extended deadline if the partnership filed for an extension). Partners need the K-1 to complete their personal returns. The K-1 reports:

• Ordinary business income or loss (Box 1)
• Rental real estate income (Box 2)
• Interest and dividend income (Boxes 5 and 6a)
• Net short-term and long-term capital gains (Boxes 8 and 9a)
• Section 179 deduction (Box 12)
• Self-employment earnings (Box 14)

Partners use this information on their individual Form 1040, reporting partnership income on Schedule E, Part II. Each partner pays income tax at their personal rate on their share of the partnership's income, regardless of whether cash was actually distributed.

Quarterly Estimated Tax Payments

Because partnerships pass income to partners without withholding tax, each partner is typically responsible for making quarterly estimated tax payments using Form 1040-ES. The estimated payment due dates are:

• Q1: April 15
• Q2: June 15
• Q3: September 15
• Q4: January 15 of the following year

Partners who expect to owe $1,000 or more in tax for the year must make estimated payments to avoid underpayment penalties. The IRS provides two safe harbor methods: pay at least 100% of the prior year's tax liability, or pay at least 90% of the current year's liability. High-income taxpayers (AGI above $150,000) must pay 110% of the prior year's liability to qualify for safe harbor. For a deeper look at estimated payments, see our quarterly estimated tax payments guide.

Penalties for Late Filing

The penalty for filing Form 1065 late is $220 per partner per month (2026 rate), up to a maximum of 12 months. For a four-partner LLC that files three months late, that is $220 x 4 x 3 = $2,640 in penalties — and the partnership did not even owe any tax. This penalty applies even if no tax is due. For more on how IRS penalties work, read our IRS late filing penalties breakdown.

State Filing Obligations

Many states require partnerships to file a state-level partnership return. Some states impose entity-level taxes on partnerships. For example, California charges a minimum $800 annual franchise tax on LLCs, plus an LLC fee for gross receipts above $250,000. Texas requires partnerships to file the franchise tax report. Even in states with no income tax, you may still face franchise taxes, annual report fees, or other obligations.