March 2026 Business Tax Deadlines: Compliance Meets Strategy

March is a pivotal month in the tax calendar. It represents the bridge between closing out the previous year's financial data and solidifying your strategy for the year ahead. For many of our clients at Lizza & Carullo CPAs & Advisors, this month is about more than just checking boxes; it is about ensuring that the financial infrastructure of your business is sound.

While the focus is often on S Corporations and Partnerships, March also carries significant deadlines for information reporting and payroll. Below is a breakdown of what is due, structured to help you maintain clarity and control over your compliance obligations.

Business processes and compliance gears

March 16: The Big Deadline for Pass-Through Entities

For most small and mid-size businesses, specifically those structured as flow-through entities, March 16 is the primary date on the calendar. This applies to businesses operating on a calendar year basis.

Partnerships (Form 1065)

If your business is a partnership, you must file Form 1065 by this date. Crucially, you must also provide each partner with their Schedule K-1 (and Schedule K-3 if applicable), detailing their share of income, deductions, and credits.

Strategic Note on Extensions: If your books require more time to reach the level of accuracy we demand—especially for complex multi-entity structures or real estate strategies—filing an extension (Form 7004) is often the smarter move. This grants an automatic 6-month extension to file the return (moving the deadline to September 15), allowing us to finalize data without rushing. Remember, an extension to file is not an extension to pay taxes owed.

S Corporations (Form 1120-S)

S Corporations must file Form 1120-S and pay any tax due by March 16. Similar to partnerships, shareholders must receive their Schedule K-1s by this date unless an extension is filed.

If we are filing an extension (Form 7004) on your behalf, we must estimate the tax owed and pay it by this date to avoid penalties. The final return and shareholder K-1s will then be due by September 15.

S Corporation Election (Form 2553)

For business owners looking to optimize their tax structure, this is a critical deadline. If you intend to be treated as an S Corporation for the calendar year 2026, you must file Form 2553 by March 16. Filing late means the S Corp treatment generally won't take effect until 2027, potentially missing out on a year of tax efficiency regarding owner compensation and distributions.

March 2: Information Returns and Paper Filing

While electronic filing is the standard for modern businesses, certain paper filing deadlines land early in the month. If you are still filing paper returns for information reporting, the following are due March 2.

  • Forms 1099 & 1096: File government copies of information returns (Forms 1099) and transmittal Forms 1096 for payments made in 2025. Note that 1099-NEC forms were due back in February.
  • Gambling Winnings: File Form 1096 and Copy A of Forms W-2G.
  • ACA Reporting (ALE): Applicable Large Employers must file paper Forms 1094-C and 1095-C. Other providers of minimum essential coverage must file paper Forms 1094-B and 1095-B.
  • Large Food & Beverage Establishments: File Form 8027 (Tip Income) and Form 8027-T.

Gain Year-Round Financial Clarity and Confidence
Partner with Lizza & Carullo CPAs & Advisors for ongoing guidance, proactive tax planning, and strategic financial support. Whether you’re growing a business or navigating personal taxes, our year-round advisory approach helps you stay organized, tax-efficient, and in control — with a team that’s here when you need us, not just at tax time.
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Note: If you file any of the above forms electronically, your deadline is automatically extended to March 31 (see below).

Farmers and Fishermen

File your 2025 income tax return (Form 1040 or 1040-SR) and pay any tax due by March 2. However, if you already paid your 2025 estimated tax by January 15, 2026, you have until April 15 to file.

Meeting delivery deadlines

March 31: Electronic Filing Deadline

At Lizza & Carullo, we emphasize tech-forward financial systems. Electronic filing is cleaner, faster, and more secure. March 31 is the final deadline for electronically filing the following with the IRS:

  • Forms 1099 (excluding 1099-NEC) and 1096
  • Forms W-2G
  • Forms 1094-C, 1095-C, 1094-B, and 1095-B (ACA Reporting)
  • Form 8027 (Tip Income)

Payroll and Withholding

March 16: If you are on a monthly deposit schedule for Social Security, Medicare, and withheld income tax, your deposit for February payments is due. This also applies to non-payroll withholding.

General Housekeeping

Weekends & Holidays: Compliance rules state that if a due date falls on a Saturday, Sunday, or legal holiday, it is pushed to the next business day.

Disaster Area Extensions: We closely monitor updates for our clients in New Jersey and nationwide. If a geographical area is designated as a disaster area, IRS deadlines may be extended. You can verify current designations here:

Moving from Compliance to Advisory

Meeting these dates is required to avoid penalties, but understanding why the numbers look the way they do is how you grow. Whether you are finalizing a partnership return or restructuring for tax efficiency, our goal is to help you move forward with confidence.

If you have questions about your filings or need to discuss an extension strategy, please reach out to our team in East Rutherford.

Gain Year-Round Financial Clarity and Confidence
Partner with Lizza & Carullo CPAs & Advisors for ongoing guidance, proactive tax planning, and strategic financial support. Whether you’re growing a business or navigating personal taxes, our year-round advisory approach helps you stay organized, tax-efficient, and in control — with a team that’s here when you need us, not just at tax time.
Schedule Your Discovery Call
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