That's normally something included in your consolidated form 1099 from your brokerage (or the 1099-DIV from the fund itself).
If dividends of $10 or more were paid to you, then the brokerage or fund is required to issue a 1099-DIV. In the brokerage consolidated 1099, you should see both the amount of dividends and any foreign tax paid appear in the particular 1099-DIV section of the statement. You may also see footnotes or additional explanatory entries relating to foreign source income. It may require reading the fine print.
Different brokerages and fund companies may present items in different ways. The standard form 1099-DIV has dividends in box 1a, qualified dividends in box 1b, and foreign tax paid in box 6.