If a taxpayer had a financial interest in, or signature authority over, a financial account in a foreign country, or they received a distribution from, or were a grantor of or transferor to, a foreign trust, what must be completed and filed? Form 1099-INT, Interest Income. Part I of the Schedule B (Form 1040), Interest and Ordinary Dividends. Part II of the Schedule B (Form 1040), Interest and Ordinary Dividends. Part III of the Schedule B (Form 1040), Interest and Ordinary Dividends