Commercial paper is an unsecured, short-term IOU that large corporations with strong credit ratings sell to institutional investors to cover routine operating costs like payroll, inventory, and receivables. Instead of paying interest, the issuer sells the note at a discount to its face value and repays the full face amount at maturity, usually within a month or two. The market is enormous, with roughly $1.3 trillion outstanding as of early 2026, and it sits at the center of how big companies fund their day-to-day operations and how institutional cash managers earn a return on parked money.1Board of Governors of the Federal Reserve System. Commercial Paper Rates and Outstanding Summary
How the Discount Mechanic Works
A commercial paper note is a promise to pay a fixed face value on a specific date. The buyer pays less than face value up front, and the gap between what they pay and what they receive at maturity is the return. If a company issues a $1 million note for $995,000 with a 30-day maturity, the buyer hands over $995,000 today and collects $1 million in a month. That $5,000 is the yield.
Annualized, that yield generally runs below what the same company would pay to draw on a bank line of credit, which is why creditworthy borrowers use the market in the first place. In late March 2026, top-rated 30-day nonfinancial commercial paper was pricing at an annualized rate around 3.71%.2Board of Governors of the Federal Reserve System. Commercial Paper Rates and Outstanding Summary The actual rate on any given issue depends on the issuer’s credit rating, the maturity, and where the Federal Reserve has set short-term rates.
One rule shapes everything else about the instrument: the money raised has to fund current operations. Working capital, inventory, receivables, payroll. It cannot be used to buy factories, real estate, or other long-term assets. That constraint comes from the federal exemption that lets commercial paper skip SEC registration, discussed below.
The Defining Features
No Collateral Behind the Note
Commercial paper is unsecured. Nothing is pledged against it. The investor is trusting the issuer’s balance sheet and the credit rating that reflects it. That is why only companies with top-tier short-term ratings can realistically sell paper at attractive rates.
Very Short Maturities
Federal law caps the maturity of exempt commercial paper at nine months, and market convention treats that as 270 days.3Office of the Law Revision Counsel. 15 USC 77c – Classes of Securities Under This Subchapter4Board of Governors of the Federal Reserve System. Commercial Paper Rates and Outstanding Summary The reality is much shorter. Average maturity is around 30 days, and plenty of paper matures in one to seven days. Companies that need ongoing funding simply issue fresh paper as old paper comes due, a practice called rolling over. The short duration is a feature for buyers, who want their cash back quickly, and a permanent source of stress for issuers, who need the market to stay open every time they need to roll.
Denominations That Exclude Retail
Minimum face values typically start at $100,000, and most trades happen in multiples of $1 million.5Federal Reserve Bank of Richmond. Chapter 9 – Commercial Paper Individual investors do not buy commercial paper directly. If you hold it, you hold it through a money market mutual fund that owns commercial paper as part of a broader short-term portfolio.
Who Issues It and Who Buys It
Issuers are the kind of names that carry a top-tier short-term credit rating: P-1 from Moody’s, A-1 from Standard & Poor’s, or the equivalent. Major banks, large industrial firms, finance companies, and utilities dominate the issuer side. Paper rated below the top tier finds little demand from the institutional buyers who set the market.
On the buyer side, money market mutual funds are the biggest single class, joined by insurance companies, pension funds, bank trust departments, and corporate treasuries managing their own cash. SEC Rule 2a-7 limits money market funds to securities with minimal credit risk and remaining maturities of 397 days or less, with the overall portfolio held to a weighted average maturity of 60 days or less.6eCFR. 17 CFR 270.2a-7 – Money Market Funds Commercial paper fits inside those limits almost by design, which is why money market funds absorb so much of it.
That relationship cuts both ways. Money market funds need commercial paper to earn a yield above Treasuries. Corporations need money market fund demand to keep their borrowing costs down. When the relationship breaks, as it did in 2008 and again in 2020, the strain shows up quickly on both sides.
How Paper Gets to Buyers
Companies place commercial paper in one of two ways. Large, frequent issuers, particularly financial firms that sell paper daily, run their own direct placement desks and sell straight to institutional buyers. Everyone else uses a dealer, typically a major securities firm that buys the paper and resells it to investors for a small commission.
Before any of that happens, the issuer needs a short-term credit rating. The rating agencies act as gatekeepers, and the rating they assign drives the discount the market will demand. A downgrade is dangerous because buyers can walk away, leaving the issuer unable to sell new paper to repay maturing notes.
Almost every issuer maintains a standby bank credit line sized to cover its outstanding paper as protection. If the market closes, the company draws on the credit line to pay off maturing notes. The rating agencies effectively require these backup lines before assigning top-tier ratings, so the bank facility and the rating support each other.
There Is No Real Secondary Market
Commercial paper does not trade actively after it is issued. Buyers hold to maturity, which is usually only weeks away. If a holder needs cash sooner, finding a buyer is difficult. In practice, institutional investors match their paper holdings to known upcoming cash needs and treat the position as illiquid.
The Regulatory Line That Shapes the Market
Commercial paper works as a fast, cheap funding tool only because it avoids SEC registration. Section 3(a)(3) of the Securities Act of 1933 provides the exemption on two conditions: maturity of nine months or less, and proceeds used for current transactions.3Office of the Law Revision Counsel. 15 USC 77c – Classes of Securities Under This Subchapter Current transactions means working capital, not long-term investment. The statute also describes the notes as ones “not ordinarily purchased by the general public,” which is the legal reason denominations stay high and the buyer pool stays institutional.5Federal Reserve Bank of Richmond. Chapter 9 – Commercial Paper
The Federal Reserve influences the market more directly through short-term interest rates. When the Fed moves the federal funds rate, commercial paper rates move with it, which changes what issuers pay and what investors earn on each new issue.
Asset-Backed Commercial Paper Is a Different Animal
Not all commercial paper is unsecured. Asset-backed commercial paper, or ABCP, is issued by special-purpose entities that hold pools of financial assets, typically trade receivables, auto loans, or credit card balances. A sponsoring bank sets up the entity, moves the receivables in, and the entity issues short-term paper backed by the cash flows those assets throw off. Reserve accounts and overcollateralization absorb losses before investors do.
ABCP carries a different risk profile than traditional commercial paper. Credit risk on the underlying assets matters, but so does liquidity risk when the assets’ cash flows do not line up with the note maturities. The sponsoring bank’s strength matters too, because the sponsor usually provides the liquidity backstop. That structure held up in calm conditions and then broke badly in 2007.
The Real Risks
Rollover Risk
The dominant risk in commercial paper is not credit loss, it is rollover risk. Because maturities are so short, issuers must constantly sell new paper to repay the paper coming due. Under normal conditions this is routine. When investors lose confidence, either in a specific issuer or in the market broadly, new paper cannot be sold and the issuer faces an immediate cash crunch with obligations due and nothing to fund them.
The pattern is old. Penn Central’s 1970 default caused investors to pull back from other issuers. Enron’s 2001 collapse produced the same reaction. Confidence is what keeps the market functioning, and confidence can vanish fast.
The 2007-2008 ABCP Run
The most severe disruption hit asset-backed commercial paper in 2007. As mortgage-related worries spread, investors refused to roll over ABCP. Outstanding ABCP fell about $190 billion in August 2007 alone, nearly 20% of the total. By year-end the market had contracted by roughly $350 billion, close to 30%. More than a third of all ABCP programs experienced runs within weeks, and once a program was in a run it rarely recovered quickly.7Board of Governors of the Federal Reserve System. Panic in the Asset-Backed Commercial Paper Market
The 2020 Freeze and the CPFF
When COVID-19 triggered a panic in March 2020, the commercial paper market seized again. Even highly rated issuers had trouble placing new paper. The Federal Reserve reactivated the Commercial Paper Funding Facility, originally built during the 2008 crisis, to buy eligible three-month unsecured and asset-backed paper directly from issuers. The backstop restored confidence quickly. The facility’s authorization expired on schedule in March 2021.8Federal Reserve Bank of New York. Commercial Paper Funding Facility
Two Fed interventions in roughly a decade point to something structural. The market runs smoothly when nothing is wrong, and it locks up when confidence breaks. Anyone holding commercial paper through a money market fund is holding an instrument whose worst-case backstop has effectively become the Federal Reserve.
Default Risk
Outright defaults are rare. High credit ratings, backup bank lines, and short maturities together keep losses uncommon. But there is no collateral, so when a default does happen, recovery depends entirely on what the bankruptcy process produces, which can be very little.
The larger danger for most people is indirect. If a money market fund holds paper from a defaulting issuer, the fund can “break the buck,” meaning its net asset value drops below $1.00 per share. That is what happened to the Reserve Primary Fund in September 2008 when it held Lehman Brothers commercial paper and its value fell to $0.97. The event triggered runs on money market funds across the industry. SEC reforms since then, including tighter credit quality rules under Rule 2a-7, have reduced but not removed this risk.6eCFR. 17 CFR 270.2a-7 – Money Market Funds
How It Compares to Other Short-Term Instruments
Commercial paper sits between the safest and the most complex parts of the money market. Treasury bills carry the full faith and credit of the U.S. government and yield less. Certificates of deposit carry FDIC insurance up to applicable limits and are less liquid for large institutional sums. Repurchase agreements are collateralized and can be overnight, with more mechanical complexity. Commercial paper offers a higher yield than Treasuries and a simpler structure than repos, at the cost of credit risk that the other three largely avoid.
For issuers, the comparison is against a bank revolving credit line. Drawing on a revolver costs more in interest and usually carries covenants restricting what the borrower can do. Commercial paper gives a creditworthy company access to a deep pool of institutional cash at rates close to the federal funds rate, with no covenants beyond repayment at maturity. The trade-off is reliability. A committed bank credit line is available in a crisis; commercial paper access can disappear overnight. That is why most issuers keep both.