US Treasury bill rates unchanged for both 3-month and 6-month bills at weekly auction

Interest rates on short-term Treasury bills were unchanged in Monday's auction with both the three-month and six-month bills going for the same rates as the previous week.

The Treasury Department auctioned $29 billion in three-month bills at a discount rate of 0.030 percent, matching last week's rate. Another $24 billion in six-month bills was auctioned at a discount rate of 0.050 percent, also unchanged from last week.

The discount rates reflect that the bills sell for less than face value. For a $10,000 bill, the three-month price was $9,999.23 while a six-month bill sold for $9,997.47. That would equal an annualized rate of 0.030 percent for the three-month bills and 0.051 percent for the six-month bills.

Separately, the Federal Reserve said Monday that the average yield for one-year Treasury bills, a popular index for making changes in adjustable rate mortgages, edged up to 0.11 percent last week from 0.10 percent the previous week.