These deadlines are relevant to your 2018 individual and business tax return.
March 15, 2019
Partnership
March 15, 2019 is the deadline to file your partnership (including multi-member LLCs filing as a partnership) tax return (Form 1065) and pay any taxes owed. Why the earlier due date you ask? The earlier deadline gives partners a chance to receive Schedule K-1s before the personal tax return due date.
For an automatic six-month extension, file Form 7004 and deposit your estimated taxes owed.
S corporation
March 15th, 2019 is the deadline to file S corporation (including multi-member LLCs filing as an S corporation) tax returns (Form 1120S) and pay any taxes owed.
For an automatic six-month extension, file Form 7004 and deposit your estimated taxes owed.
April 15, 2019
Individual and sole proprietorship
April 15, 2019 is the deadline to file individual (Form 1040, 1040A, 1040EZ) and sole proprietorship (including single-member LLCs filing as a sole proprietorship) (Schedule C 1040) tax returns.
For an automatic six-month extension, file Form 4868 and deposit your estimated taxes owed by today.
C corporation
April 15, 2019, is the deadline to file C corporation tax returns (Form 1120).
For an automatic six-month extension, file Form 7004 and deposit your estimated taxes owed by today.