Commercial Paper and ABCP

A large, well-rated corporation needs $50 million for six weeks to cover a seasonal payroll gap. Going to a bank for a six-week loan is slow and relatively expensive; issuing a public bond for six weeks is absurd. The market's answer is commercial paper: a short-term, unsecured IOU sold directly to money-market investors, typically maturing in under nine months so it avoids SEC registration requirements entirely. It is corporate borrowing stripped down to its simplest, fastest form — no collateral, no covenants beyond the issuer's own credit standing, priced like a Treasury bill.

Pricing a CP note

Like a T-bill, CP is quoted on a discount basis. A corporation issues 90-day paper with $10 million face value at a discount rate of 5.00%.

Price today.

$$P = F \times \left(1 - d\times\frac{n}{360}\right) = 10{,}000{,}000 \times \left(1 - 0.0500\times\frac{90}{360}\right) = 9{,}875{,}000$$

i.e. a price of $9,875,000

The corporation's actual cost of borrowing (bond-equivalent yield):

$$\text{BEY} = \frac{10{,}000{,}000 - 9{,}875{,}000}{9{,}875{,}000}\times\frac{365}{90} \approx 5.13\%$$

The company raises $9.875 million today and repays $10 million in 90 days — an effective annualized cost of about 5.13%, typically cheaper than an equivalent bank line for a top-rated issuer, which is the entire commercial case for using CP instead of a bank loan.

Rolling paper — and the risk hidden in it

CP is almost never a single 90-day transaction; issuers roll it continuously, issuing new paper to repay maturing paper, effectively running permanent short-term financing through a chain of temporary loans. This is efficient when credit markets are calm and dangerous when they are not: if investors suddenly refuse to buy an issuer's new paper, there is no time to arrange alternative financing before the maturing paper comes due. That is why virtually every CP issuer maintains a backup bank credit line — insurance against being unable to roll, rarely drawn, but priced into the issuer's overall cost of funding.

Ratings do the underwriting

Because CP carries no collateral and is sold quickly, money-market funds and other buyers lean almost entirely on credit ratings to decide what to hold. The top rating tier — A-1/P-1 in the two major agencies' notation — is effectively a prerequisite for easy access to the market; a downgrade out of that tier can shut an issuer out of CP altogether within days, forcing it to draw down its backup bank line at a much higher cost. This is a sharper cliff than in the bond market, where a single-notch downgrade usually just widens a spread rather than closing off funding entirely, and it is part of why CP issuers manage their credit ratings so conservatively relative to how much leverage they could otherwise carry.

ABCP: the same trick for a pool of receivables

Asset-backed commercial paper applies the identical structure to a different kind of borrower: instead of a corporation's general credit, a bankruptcy-remote conduit issues CP backed by a pool of assets — credit card receivables, auto loans, trade receivables — that generate cash flow to repay it. The conduit typically carries a liquidity backstop from a sponsoring bank, a committed line meant to repay maturing ABCP if the conduit cannot roll new paper.

Where it shows up

Commercial paper is a core holding for money-market funds (see Money Market Funds and Constant NAV) seeking yield above T-bills with only modestly more credit risk, and CP issuance volumes are watched as a real-time gauge of corporate funding stress — a sharp drop in outstanding CP, or a widening of CP-to-bill spreads, is one of the earliest signals that credit markets are tightening, well before it shows up in bank lending data.

Key terms

• Commercial paper (CP) — short-term, unsecured corporate debt, typically maturing under nine months, sold at a discount to face value.
• Rolling — replacing maturing CP with newly issued CP to maintain continuous financing.
• Backup line — a bank credit facility that stands ready to repay CP an issuer cannot roll.
• ABCP conduit — a bankruptcy-remote vehicle issuing CP backed by a pool of receivables, typically with a bank liquidity backstop.