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- Extended tax year 2025 returns are due October 15, 2026 for single member LLCs and C corps, and tax year 2026 returns are due in 2027.
- LLCs taxed as partnerships or S corps file by March 15, 2027, while single member LLCs and C corps file by April 15, 2027.
- LLC owners, not the LLC itself, make quarterly estimated tax payments if they expect to owe $1,000 or more, and the next one is due January 15, 2027.
- Filing an extension gives more time to file but not to pay, so any tax owed is still due on the original deadline.
- Late filing penalties build every month and are charged per owner for partnerships and S corps.
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Book a Free ConsultationCalendar year LLCs taxed as partnerships or S corps file by March 15, and single member LLCs and C corps file by April 15. For tax year 2026, those dates fall in 2027.
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