January 15, 2025 - Estimated payment #4 for tax year 2024
January 15, 2025 - IRS begins accepting business returns
January 27, 2025 - IRS begins accepting individual returns
January 31, 2025 - Form 1099-NEC, Form W-2, Form 941/944, Form 940
February 18, 2025 - Form 1099-Misc to receipient
February 28, 2025 - paper filed Form 1099-Misc
March 17, 2025 - Tax returns for Partnership (Form 1065) and S Corporation (Form 1120S)
March 31, 2025 - E-file Form 1099-Misc
April 15, 2025 - Tax returns for Individual (Form 1040) and C Corporation (Form 1120)
April 15, 2025 - Estimated payment #1 for tax year 2025
April 15, 2025 - deadline to file 2021 tax returns in order to receive a refund
May 15, 2025 - Annual return for Non-Profit (Form 990) (Dec 31 fiscal end)
June 16, 2025 - Estimated payment #2
September 15, 2025 - Estimated payment #3; Extesion deadline Partnership and S Corporation
October 15, 2025 - Extension deadline Individual and C Corporation
November 15, 2025 - Extension for Non-Profit (Dec 31 fiscal end)