Do NOT open an account with Treasury Direct. I attempted to change the bank account linked to my treasury direct account and now my account is locked. I had to submit a form notorized by my bank. Now Im being told it will take 6 months to make any changes. They are now basically holding the money from my t bills that have matured and not giving me any interest on them for 6 months. The customer service is horrendous and the website is flawed. Instead buy your t-bills in the secondary market because you are basically getting the same return.