Partnership tax returns are due March 15 for businesses operating on a calendar year. If your fiscal year ends on a different date, the return is due on the 15th day of the third month after your year-end. The earlier deadline compared to individual returns exists because partnerships issue K-1s to partners, and those partners need that information to file their own returns by April 15.

Form 1065 is an information return, meaning the partnership itself doesn’t pay income tax. Instead, profits and losses flow through to the individual partners who report them on their personal returns. This pass-through structure is why timing matters so much. A late partnership return means late K-1s, which can delay every partner’s personal filing.

Extensions are available by filing Form 7004 before the March 15 deadline. This gives you an automatic six-month extension, pushing the due date to September 15. The extension applies to filing the return, not to any tax obligations the partners might have. Partners may still need to make estimated payments based on their expected share of partnership income even while the return is on extension.

Boca Raton fractional CFO services often include coordinating partnership return timing with the partners’ personal tax planning. For partnerships with multiple owners, getting K-1s distributed promptly affects everyone’s ability to plan and file accurately.

Late filing penalties for partnerships are steep. The IRS charges $220 per partner per month the return is late, up to 12 months. A five-partner LLC that files three months late owes $3,300 in penalties before any other considerations. These penalties apply even if no tax is owed at the partnership level because the return is still required.

K-1s should reach partners by March 15 or shortly after if an extension is filed. Many partnership agreements require K-1 distribution within a specific timeframe. Even without a contractual requirement, partners need this information to complete their own returns or extend them properly.

State filing requirements vary. Florida doesn’t impose a state income tax, so Florida partnerships file federally and provide K-1s but don’t have a separate state partnership return. Partnerships with operations in other states may have additional filing obligations with different deadlines.

Planning ahead makes the March deadline manageable. Business tax return preparation works best when books are closed and reconciled well before the filing deadline. Waiting until early March to start gathering documents creates unnecessary pressure and increases the chance of errors or missed deadlines.