march15th.com(718) 227-6035

March 15 comes for every S-corp and partnership.

Business returns, K-1s for every owner, extension requests and new S-corp elections are all due the same day, a month before everyone else's. Our CPAs in New York and New Jersey file them on time, every year.

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Get on the calendar

Have a CPA file your 1065 or 1120‑S

Earlier is always cheaper than later.

Business tax season, in order

  1. Jan 31W-2s and 1099-NECs out to workers and contractors
  2. Mar 15Partnership (1065) and S-corp (1120-S) returns, K-1s to owners, extension requests, and new S-corp elections
  3. Apr 15Individual returns, which need the K-1s from March
  4. Sep 15Extended 1065 and 1120-S returns

Calendar-year businesses. When a date falls on a weekend or holiday, it moves to the next business day.

The fine print, explained

Who has to file by March 15?+

Calendar-year partnerships, including most multi-member LLCs, file Form 1065, and S corporations file Form 1120-S, along with their New York or New Jersey returns. Their owners need the K-1s from those returns to file their own.

Can I just file an extension?+

Yes. Form 7004 gives an automatic six-month extension, to September 15, but it has to be filed by the March deadline. It extends the time to file, not to pay, and your partners or shareholders still wait on their K-1s.

What happens if we miss it?+

The IRS charges a late-filing penalty for every partner or shareholder, for every month the return is late, up to 12 months. For a business with a few owners it adds up quickly, and state penalties come on top.

Is March 15 also the S-corp election deadline?+

For a calendar-year business, yes. Form 2553 is due two months and 15 days into the tax year, so March 15 is the last day to elect S-corp treatment for this year without asking for late-election relief.

Our books aren't ready. Is it too late to hire you?+

No, but sooner is better. Send us what you have. We'll tell you honestly whether we can file by the deadline or should file the extension now and finish properly.

Don't let the 15th sneak up.