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Most LLC owners I talk to know April 15. Fewer know that if their LLC files as an S corp or a partnership, the return is due a month earlier, on March 15.
The other one that catches people is June. Estimated payments sound quarterly, but the second one comes two months after the first.
So here's the whole year on one page. Save it to your phone and you won't have to think about it again until January.
Katie Walker
CFO, Tenax Accounting
The short answer
LLC tax deadlines in 2027 depend on how the LLC is taxed. LLCs taxed as partnerships or S corps file by March 15, 2027. Single-member LLCs report on the owner's personal return, due April 15, 2027. Estimated tax payments for 2027 are due April 15, June 15, and September 15, 2027, and January 18, 2028.
By how your LLC is taxed
Single-member LLC
Form 1040 with Schedule C
April 15 return due
October 15 if extended (Form 4868)
Partnership
Form 1065, K-1s to partners
March 15 return due
September 15 if extended (Form 7004)
S corp
Form 1120-S, K-1s to owners
March 15 return due
September 15 if extended (Form 7004)
Every 2027 date
- January 15 Q4 2026 estimated tax payment
- February 1 W-2s and 1099-NEC to the IRS and recipients
- March 1 Paper-filed 1099s to the IRS
- March 15 S corp and partnership returns, or extend with Form 7004
- April 15 Single-member LLC return, or extend with Form 4868. Q1 estimated payment.
- June 15 Q2 estimated payment
- September 15 Q3 estimated payment. Extended S corp and partnership returns.
- October 15 Extended single-member LLC return
Federal deadlines only. State deadlines vary.
Questions
Is my LLC's tax return due March 15 or April 15, 2027?
It depends on how the LLC is taxed. LLCs taxed as partnerships (Form 1065) or S corps (Form 1120-S) are due March 15, 2027. Single-member LLCs report on the owner's personal return (Form 1040 with Schedule C), due April 15, 2027.
When are 2027 estimated tax payments due?
For the 2027 tax year: April 15, June 15, and September 15, 2027, and January 18, 2028. The January 15, 2027 payment covers the fourth quarter of 2026.
Does an extension give me more time to pay?
No. An extension gives you more time to file the return. Tax owed is still due on the original deadline, and interest and penalties apply to late payments.
What is the extended deadline for an LLC return in 2027?
September 15, 2027 for partnership and S corp returns extended with Form 7004. October 15, 2027 for single-member LLC returns extended with Form 4868.
Related
2027 tax calendar for LLC owners (free download) →
How LLC founders get paid →
What bookkeeping and tax cost at Tenax →