Cash management bill

A cash management bill (CMB) is a short-term debt security issued by the U.S. Treasury to bridge temporary shortfalls in the government's cash balance — for example, in the days before a large wave of tax receipts arrives. Unlike regular Treasury bills, which are auctioned on a fixed schedule, CMBs are issued irregularly, whenever the Treasury needs cash.

CMBs work like T-bills: they pay no coupon, are sold at a discount to face value, and return the full face amount at maturity, with the difference representing the investor's interest. Their maturities are unusually short and flexible — often just a few days to a few months — and are set to match the Treasury's projected cash needs. A CMB might mature in 7, 14, or 42 days, for instance.

Because they are direct obligations of the U.S. government, cash management bills carry essentially no default risk. They typically trade in large denominations and are bought mainly by institutional investors such as money market funds looking for a safe, very short-term place to park cash. Their yields are usually close to those of comparable T-bills, sometimes slightly higher to compensate for the irregular issuance schedule.

On the Series 7 exam, cash management bills appear alongside Treasury bills, notes, and bonds as part of the U.S. government debt landscape. Know that CMBs are the most flexible Treasury security: unscheduled issuance, very short maturities, sold at a discount, and backed by the full faith and credit of the U.S. government.