Usually that is correct, especially for Muni-Bonds.
For Muni's any premium paid is required to be amortized yearly until the basis=face value (usually, amortized to the first call date). Thus the basis is only different if you sell the bonds before their call date.
Depending on when you bought them, the yearly amortized amount of the premium paid was indicated in box 13 of the 1099-INT and reduced the reported box 8 amount each year of amortization ( years back it was in a different box, or even in a special spot, since box 13 didn't exist until 2015)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
