text: where can i get the t-bill interest rate information? websites? updated regularly websites? the best site to get information about the current rate of most t-bills is the treasury direct website provided directly by the government.  http://www.treasurydirect.gov/  this is a great website to not only get information, but if you are interested in investing in t-bills commission free, this site allows you to set up an account with the government, and invest personally.  it even allows you to set up automatic monthly withdrawals, automatic rollovers when your t-bills mature, and access to a wide variety of us government securities.