The tax must be reported  on Form 720, Quarterly Federal Excise Tax Return, due for the first full calendar quarter after the end of the corporation’s taxable year, with the Form 7208, Excise Tax on Repurchase of Corporate Stock, attached. Form 7208 is used to calculate the amount of stock repurchase excise tax owed.

The forms due for taxable years ending after Dec. 31, 2022, and on or before June 30, 2024, must be filed by October
31 this year

Corporations with more than one taxable year ending after Dec. 31, 2022, and on or before June 30, 2024, should file a single Form 720 with two separate Forms 7208 (one for each taxable year) attached by October. 31.