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Please clarify your question. You are asking where on Form 1099INT would Box 8 be entered.
On Form 1099INT, Box 8 -shows the original issue discount on U.S. Treasury obligations. This represents taxable interest on the federal income tax level but is typically tax-exempt interest for state and local income taxes.
See below, there is a box 8 in the Interest & Dividend section of the TurboTax Business interview.
Also, see the additional link below for more information on OID.
