@ilg10402021
See https://www.irs.gov/pub/irs-pdf/f1099oid.pdf
If there is an amount in both boxes 6 and 11, for a tax-exempt obligation that is a covered security acquired on or after January 1, 2017, and is issued with OID, the amount in box 6 shows the amount of acquisition premium amortization for the year that reduces the amount of your tax-exempt OID for the year. The payer may, but is not required to, report the acquisition premium for a tax-exempt obligation that is a covered security acquired before January 1, 2017, and issued with OID
