Per the IRS, file Form 1099-INT for each person:
- To whom you have paid amounts of at least $10, reportable in boxes 1, 3, and 8.
- For whom you withheld, and on whose behalf you paid, any foreign tax on interest.
- From whom you withheld (and did not refund) any federal income tax under the backup withholding rules regardless of the amount of the payment.
View More About Form 1099-INT on IRS.gov