You'll need at least $10 in earnings
You'll get a 1099-DIV each year you receive a dividend distribution, capital gains distribution, or foreign taxes paid for your taxable investments.
But if the amount is less than $10 for the year, no 1099-DIV is sent.
Note: Clients that transitioned from mutual fund account(s) to a Vanguard Brokerage Account
The mutual fund account reports earnings at the Fund level whereas the Brokerage account will report the aggregate earnings across all investments.
But remember: You're still required to report that income to the IRS.