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The acquisition premium is is an amount that reduces the amount of OID that is considered to be taxable interest and is amortized.

Box 6. Acquisition Premium 

For a covered security acquired with acquisition premium, enter the amount of premium amortization for the part of the year the debt instrument was owned by the holder.  If you reported a net amount of OID in box 1, 8, or 11, as applicable, leave this box blank. You may, but are not required to, report the acquisition premium for a tax-exempt obligation that is a covered security acquired before January 1, 2017.

This can be found when you are entering your Form 1099-OID.  Make sure to use the following steps to enter the acquisition premium.

1. Open your TurboTax account/return (Online or CD/Download)
2. Select Wages & Income > Interest and Dividends > 1099-OID, Foreign Accounts > Start or Update
3. Select the check box beside 'Form 1099-OID...' > Continue > Yes > I'll type it in myself > Continue
4. Type in the information for each box where there is an amount on your Form 1099-OID
5. See the image below.

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