Accrued interest on the coupon you would apply as an adjustment to your 1099-INT in the year you get the first coupon after purchase. If you bought the Treasury later in 2024 after the last coupon then you need to carry it over for 2025 (your broker likely won't track this, just provide details of what was paid each year not how it lines up to the coupons - the onus is on the bond holder here)
Note there is a flaw in TT on accrued interest adjustments - if your 1099-INT contains more than one type of income (i.e. Box 1/3/8) and you have accrued interest on any of them then you need to enter the 1099-INT details separately by box (along with respective premium boxes if they apply), because you can only input one accrued interest adjustment per 1099-INT and TT doesn't know which box it applies to. The adjustment is entered into TT in the interview screens following the main 1099 entry screen.
See Pub550 (link below) - "Accrued interest on bonds" section
"If you received a Form 1099-INT that reflects accrued interest paid on a bond you bought between interest payment dates, include the full amount shown as interest on the Form 1099-INT on Schedule B (Form 1040), Part I, line 1. Then, below a subtotal of all interest income listed, enter “Accrued Interest” and the amount of accrued interest you paid to the seller. That amount is taxable to the seller, not you. Subtract that amount from the interest income subtotal. For more information, see Bonds Sold Between Interest Dates, earlier."
Re the AMD (unless you elect to pay this as part of income currently i.e. annually), in 2027 you will get a 1099-B for the maturity showing the AMD and Gain/Loss; this will be adjusted by TT to reflect the AMD on Schedule B as ordinary income and $0 gain on Schedule D. Note there is some ambiguity/interpretation whether AMD is state tax exempt depending how your state tax code is worded.
See Pub 550 "Market Discount Bonds" section
https://www.irs.gov/pub/irs-pdf/p550.pdf
Not a CPA/Expert above is correct to best of my knowledge/experience dealing with these, hope this helps; - pls see Pub 550 for more info.
