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March 2026 Tax Calendar: Critical Deadlines for Partnerships and S Corps
March is a pivotal month in the tax world, particularly for flow-through entities. While individual taxpayers are still gathering documents, businesses—specifically Partnerships and S Corporations—face their primary filing deadline. At The Tax Cuttery, we view this period not just as a compliance hurdle, but as a critical checkpoint in your annual wealth strategy. Ensuring accuracy on these returns is essential because the K-1s issued now dictate the personal tax outcomes for partners and shareholders later.
Here is your roadmap for business tax deadlines in March 2026.
March 2: Information Returns & Paper Filings
While many deadlines fall on the first of the month, the specific timing for 2026 pushes these to March 2. This date primarily affects businesses that still file paper forms or have specific industry requirements.
Information Returns (Forms 1099 & 1096)
If you are filing paper copies with the government, you must submit Forms 1096 and the accompanying 1099s (excluding the 1099-NEC, which was due earlier) by this date. Note that for 1099-NECs, the window has already closed.
Gambling Winnings & Tip Reporting
For payers of gambling winnings, file Form 1096 along with Copy A of all Forms W-2G issued for 2025. Similarly, large food and beverage establishments must file paper Form 8027 to report tip income. If you file these electronically, you automatically gain an extension until March 31.
ACA Reporting (Forms 1094 & 1095)
Applicable Large Employers (ALEs) filing paper forms must submit Forms 1094-C and 1095-C to the IRS. Other providers of minimum essential coverage must file Forms 1094-B and 1095-B. As with other information returns, electronic filers have until the end of the month.
Important for Employees: Regardless of how you file with the IRS, you must provide the recipient copies (Form 1095-B or 1095-C) to your responsible individuals or full-time employees by this date.
Farmers and Fishermen
If you did not make an estimated tax payment by January 15, your 2026 income tax return (Form 1040) is due today to avoid penalties. If you made the estimated payment, you have until the standard April deadline.
March 16: The Major Business Deadline
For many of our clients in Central Florida and nationwide, this is the most significant date on the Q1 calendar. It represents the filing deadline for calendar-year Partnerships and S Corporations.
Partnerships (Form 1065)
You must file the 2025 Form 1065 and furnish Schedule K-1s to each partner. The K-1 is vital as it reports the partner's share of income, deductions, and credits required for their personal returns.
Need more time? You can request an automatic 6-month extension by filing Form 7004.
Extension Note: If you extend, you must still provide the K-1s (and K-3s if applicable) to partners by September 15.
S Corporations (Form 1120-S)
S Corps must file their 2025 income tax return and pay any tax due. Similar to partnerships, shareholders must receive their Schedule K-1s by this date to complete their individual filings.
Filing an Extension: If the books aren't quite ready, file Form 7004 for a 6-month extension. However, please remember: an extension to file is not an extension to pay. You must estimate and pay any tax owed by March 16 to avoid interest and penalties.
S Corporation Election (Form 2553)
If you are an LLC or corporation intending to be taxed as an S Corp for the calendar year 2026, you must file Form 2553 by this date. Missing this window generally means the election won't take effect until 2027, potentially costing you significant self-employment tax savings.
March 31: Electronic Filing Deadline
As a modern, tax-first firm, we highly encourage electronic filing for accuracy and efficiency. March 31 is the deadline for electronically filing the following with the IRS:
Forms 1099 (excluding 1099-NEC) and 1098.
Forms W-2G (Gambling Winnings).
Forms 8027 (Tip Income).
ACA Forms 1094-C, 1095-C, 1094-B, and 1095-B.
Holidays, Weekends, and Disaster Relief
When a due date falls on a weekend or legal holiday, the deadline shifts to the next business day. Additionally, the IRS frequently grants relief to designated disaster areas. If your business is located in an affected region, check the FEMA and IRS disaster relief pages for updated extensions.
Managing business tax deadlines is about more than just avoiding late fees; it's about maintaining the financial health of your company. If you need assistance with S Corp elections, filing extensions, or year-round tax planning, contact The Tax Cuttery today.
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Securities offered through PFS Investments Inc., member FINRA & SIPC. Investment advisory services may be offered through PFS Investments Inc. or, where applicable, through a separately registered investment adviser. Paul D. Diaz is an IRS Enrolled Agent & IRS Certifying Acceptance Agent and provides ITIN/W-7, tax preparation, tax resolution, and tax advisory services through THE TAX CUTTERY®, an independent firm. Tax services are not offered through PFS Investments Inc. or its affiliates and are solely the responsibility of THE TAX CUTTERY®. This message is not intended as an offer or solicitation in any jurisdiction where such offer or solicitation would be unauthorized. All investments involve risk, including the potential loss of principal. Past performance is not indicative of future results.
Paul D. Diaz, EA, MBA, has unlimited representation rights before the Internal Revenue Service.