Jan. 16: Final estimated tax payment for 2023 due

Jan. 29: IRS begins processing 2023 tax returns

April 15: Filing deadline for 2023 taxes. First estimated tax payment for tax year 2024 due

June 17: Second estimated tax payment for 2024 due

Sept. 16: Third estimated tax payment for 2024 due

Oct. 15: Extended deadline to file 2023 tax return

Jan. 15, 2025: Fourth estimated tax payment for 2024 due