I have not done this. I've only bought Savings Bonds from TreasuryDirect, mostly because the website is absolute ass. Whenever I've contemplated buying "Treas

I have not done this. I've only bought Savings Bonds from TreasuryDirect, mostly because the website is absolute ass. Whenever I've contemplated buying "Treasury Marketable Securities", I've always just looked at using my broker. Every year, you'll get a 1099-INT for the coupon payments. But yes, if you want to sell not-at-maturity, you'll transfer it to a broker. That transfer should be in-kind and should not have any tax reporting consequences. When you sell you will get a 1099-B and your broker might not know your cost basis, so you may get a reported basis of zero and have to correct it. Or you might get the correct cost basis.