Important Tax Dates for 2025

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Jan 31 — File W-2/W-3 with SSA and furnish W-2s to employees; file 1099-NEC with the IRS and furnish to recipients.

Feb 28 (paper) / Mar 31 (e-file) — Most 1099s (except NEC) are due to the IRS, marking important federal tax dates for 2025 tax deadlines.

Mar 3 — Farmers & fishermen (if no Jan 15 estimate paid): file and pay 2024 tax.

Mar 17 — Partnership (1065) and S-corp (1120-S) returns (calendar-year) or file Form 7004. (Mar 15 falls on a Saturday.)

Apr 15 — Individuals (1040) file/pay or file 4868; 2025 Q1 estimated tax; C-corp (1120) file/pay or file 7004.

Jun 16 — 2025 Q2 estimated tax (moved from Jun 15 for weekend).

Sep 15 — 2025 Q3 estimated tax; Partnership & S-corp returns on extension.

Oct 15 — Individual (1040) and C-corp (1120) returns on extension; FBAR (FinCEN Form 114) extended due date (automatic—no form needed).

For Indiana tax deadlines, remember the employer payroll (Form 941) quarterly filings: Apr 30, Jul 31, Oct 31 (Q1–Q3 2025).

Individuals (Indiana)

The 2025 tax deadlines for filing the IT-40 are due on April 15, 2025, with extensions available until November 17, 2025. Indiana Government

For the 2025 Indiana estimated tax (ES-40/IN-ES), the payment deadlines are April 15, June 16, September 15, 2025, and January 15, 2026. IARA

Employers (Indiana)

Employers must submit the WH-3 along with W-2s to the DOR by January 31, 2025 (e-filing is required if there are more than 25 W-2s). Indiana Government+1

Monthly WH-1 & ST-103 filings are due on the 20th for early filers or the 30th for monthly filers of the following month—this is now reflected in the notes. Indiana Government

Businesses (Indiana)

For S-corporations (IT-20S) and Partnerships (IT-65), the 2025 tax deadlines are set for April 15, 2025, for calendar-year filers (or if federal 7004 is accepted). IARA+1

C-corporations (IT-20) need to file by May 15, 2025, which is the 15th day of the fifth month after year-end, in accordance with Indiana tax deadlines. Indiana Government