When you purchase a bond or note at a discount (less than its face value), you'll get Form 1099-OID (Original Issue Discount). The discount is taxable interest over the life of the bond, which gets reported every year you hold the bond, even if you don't actually receive any interest.
If you have Form 1099-OID please see below for more information on how to enter it in TurboTax Online:
https://ttlc.intuit.com/replies/5397942
