Yes—TaxAct supports adding one 2025 Form 8621 within its stated e-file limit, and you should file it together with your Form 1040, not mail it separately after e-filing the 1040.

The TaxAct® program supports the entry of fifty (50) Forms 8621 Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund per return. If you need to file more than 50 Forms 8621 through TaxAct, you must paper file your return, but you can still enter the 50+ Forms 8621 in TaxAct so they flow to the other necessary forms by following these steps:

You can use the Forms Assistant to search for and add Form 8621 to your return.

When and Where To File

Attach Form 8621 to the shareholder's tax return (or, if applicable, partnership or exempt organization return) and file both by the due date, including extensions, of the return at the Internal Revenue Service Center where the tax return is required to be filed. If you are not required to file an income tax return or other return for the tax year, file Form 8621 directly with the Internal Revenue Service Center, Ogden, UT 84201-0201.

Part II-C; Part IV

Once made, the election applies to all subsequent tax years unless the election is revoked or terminated pursuant to Regulations section 1.1296-1(h)(3). A shareholder that has made a mark-to-market election under section 1296 with respect to PFIC stock completes lines 10a through 12 with respect to PFIC stock that the shareholder holds at the close of its tax year, and lines 13a through 14c, with respect to PFIC stock that it sold or disposed of during its tax year.

Part IV, lines 14b–14c

Enter the loss from line 13c, but only to the extent of unreversed inclusions on line 14a. Include this amount as an ordinary loss on your tax return. If the loss on line 13c exceeds unreversed inclusions on line 14a, complete line 14c. Enter the amount by which the loss on line 13c exceeds unreversed inclusions on line 14a. Include this amount on your tax return according to the rules generally applicable for losses provided elsewhere in the Code and regulations.

1296(b)(1)

The adjusted basis of stock in a passive foreign investment company— (A) shall be increased by the amount included in the gross income of the United States person under subsection (a)(1) with respect to such stock, and (B) shall be decreased by the amount allowed as a deduction to the United States person under subsection (a)(2) with respect to such stock.

1296(c)(2)

loss on the sale or other disposition of marketable stock in a passive foreign investment company (with respect to which an election under this section is in effect) to the extent that the amount of such loss does not exceed the unreversed inclusions with respect to such stock, shall be treated as an ordinary loss. The amount so treated shall be treated as a deduction allowable in computing adjusted gross income.

Tax Year 2025 Form Number 8621 Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund

Page 2, When To File; Total Time Allowed

For a 2025 calendar year return, this is April 15, 2026, for most people. Generally, we can’t extend the due date of your return for more than 6 months (October 15, 2026, for most calendar year taxpayers). Although you aren’t required to make a payment of the tax you estimate as due, Form 4868 doesn’t extend the time to pay taxes.

Purpose of Form

Use Form 8949 to report sales and exchanges of capital assets. File Form 8949 with the Schedule D for the return you are filing.