If a Treasury Bill is bought on the secondary market in 2023 and matures in 2023, where does the cap gains portion of the gain go on tax forms? On a line on the 8949? The interest obviously goes along with other interest, but I am referring to the gain/loss on the bill itself since it was bought on the secondary market for a premium or a (whatever the word is that is when a bond is bought for a lower price than issued to make up for the interest). For Example you can buy T-Bills on the secondary market with a rate of 2% but is priced differently to make up for the interest change. Where does that gain/loss go on tax forms?