2018 tax adjustment in 2019

in 2019 I was billed for an additional $107.67 the IRS said I owed for 2018.  (I didn't owe, but it was the IRS so I just paid it.  Then I received a notice of "interest paid or credited" for $169.22 saying it's taxable interest and I must report it as income on my return.  Says it may have been paid or applied against other taxes owed.   Where do I put this on my return?