Form 2439 Notice to Shareholder of Undistributed Long-Term Capital Gains is a form received after the end of the year like any other form (i.e. W-2, 1099-INT, etc.). If you received a Form 2439 with an amount in Box 2 Tax paid by the RIC or REIT on box 1a gains, you would report the amount on Schedule 3 (Form 1040) Additional Credits and Payments, Line 12a.
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