Commercial paper is a short-term, unsecured promissory note that large corporations and financial institutions sell directly to institutional investors to cover immediate funding needs like payroll, inventory, and receivables. Notes mature in no more than nine months, which keeps them outside the SEC’s registration process for most securities. The U.S. market held roughly $1.3 trillion outstanding in late 2025, with yields recently running between about 3.6% and 4.4% depending on the issuer’s credit quality and how long the note runs.
What Commercial Paper Is, Legally
At its core, a piece of commercial paper is a promissory note: the issuing company promises to pay the holder a fixed amount on a specific date. Under Article 3 of the Uniform Commercial Code, these notes qualify as negotiable instruments, so they can be freely transferred from one investor to another.1Legal Information Institute. Uniform Commercial Code 3-104 – Negotiable Instrument Whoever holds the note holds a direct claim against the issuer for the face value when it comes due. That transferability is what separates commercial paper from an ordinary private loan.
The “unsecured” label is the detail that matters most for risk. Nothing is pledged as collateral. If the issuer defaults, holders stand in line as general creditors with no asset to seize. The only thing backing the note is the issuer’s overall creditworthiness, which is why the market effectively limits participation to companies with strong credit ratings.
Most commercial paper today exists as electronic book entries rather than physical certificates. Denominations are large, typically $100,000 or more, which keeps this market firmly in institutional territory. Individual investors almost never buy commercial paper directly; retail exposure comes through money market funds.
The Nine-Month Maturity Limit
The single most important rule governing commercial paper sits in Section 3(a)(3) of the Securities Act of 1933. That provision exempts from SEC registration any note that arises out of a current transaction and matures in no more than nine months.2Office of the Law Revision Counsel. 15 USC 77c – Classes of Securities Under This Subchapter The Federal Reserve treats this as a 270-day ceiling for purposes of tracking the market.3Federal Reserve. Commercial Paper Rates and Outstanding Summary – About
Staying under that limit is what makes commercial paper cheap and fast to issue. A full SEC-registered bond offering takes weeks or months of legal review, audits, and disclosure drafting. Commercial paper bypasses all of that. Notes can move from pricing to settlement in hours. A note that exceeded the nine-month window would lose the exemption and expose the issuer to the full weight of federal registration requirements, including potential penalties for selling unregistered securities.
In practice, most paper matures far sooner than the legal maximum. The Federal Reserve reports an average maturity of about 30 days.3Federal Reserve. Commercial Paper Rates and Outstanding Summary – About Many notes mature overnight or within a week. Shorter maturities let issuers continuously adjust how much they borrow to match actual cash needs. Money market funds, the largest class of buyers, also push issuers toward shorter paper: SEC Rule 2a-7 caps the dollar-weighted average maturity of a money market fund’s portfolio at 60 days.4eCFR. 17 CFR 270.2a-7 – Money Market Funds
What the Money Can Be Used For
The registration exemption carries a strings-attached rule about use of proceeds. Section 3(a)(3) requires that the money go toward “current transactions,” meaning the issuer’s day-to-day operational spending.2Office of the Law Revision Counsel. 15 USC 77c – Classes of Securities Under This Subchapter That covers payroll, inventory purchases, managing receivables, and other routine business expenses. Financial companies use proceeds to fund short-term lending to their own customers.
What it does not cover: building a factory, acquiring another company, or restructuring long-term debt. Those are capital expenditures and strategic investments, not current transactions. An issuer that used commercial paper proceeds for long-term purposes would risk losing the exemption, which would retroactively turn the notes into unregistered securities. Federal banking regulations reinforce the same test, defining commercial paper as notes whose proceeds fund current transactions and that are sold to sophisticated institutional buyers.5eCFR. 12 CFR 250.221 – Issuance and Sale of Short-Term Debt Obligations by Bank Holding Companies
The current transactions test provides a form of built-in investor protection. Because the money flows into activities that generate revenue quickly, incoming cash from sales or services should be available to repay the note when it matures.
Who Can Issue, and the Role of Credit Ratings
No law requires an issuer to obtain a credit rating before selling commercial paper. The market, however, won’t function without one. Investors buying 30-day notes don’t have time to run their own deep financial analysis on each issuer. They rely on the rating agencies to signal whether the issuer can pay.
Moody’s assigns short-term ratings on a scale where P-1 represents “superior ability to repay short-term debt obligations,” P-2 indicates “strong ability,” and P-3 means “acceptable ability.”6Moody’s. Moody’s Rating Symbols and Definitions S&P uses a parallel scale where A-1 is the highest short-term category, with an A-1+ designation for issuers whose capacity to pay is “extremely strong.”7S&P Global Ratings. S&P Global Ratings Definitions Issuers rated below the top tiers either find no buyers or must offer yields high enough to make the paper uneconomical compared to a bank loan.
Ratings aren’t a one-time stamp. Agencies monitor issuers continuously, and a downgrade can shut an issuer out of the market overnight because many institutional buyers have internal policies prohibiting lower-rated paper.
Backup Lines of Credit
Rating agencies and institutional buyers also expect issuers to maintain backup credit lines with commercial banks. These facilities act as insurance: if an issuer can’t sell new paper to repay notes coming due, it draws on the bank line instead. The bank charges a commitment fee for keeping the credit available, and the issuer may never actually use it. This arrangement became standard after Penn Central Transportation Company defaulted on $82 million in commercial paper in 1970 and rattled the market; within a few years, virtually all nonfinancial issuers maintained backup commitments covering their full commercial paper balance.8Berkeley Law. When Safe Proved Risky: Commercial Paper During the Financial Crisis of 2007-2009
How Commercial Paper Reaches Investors
There are two distribution channels. Large financial companies often sell directly to investors, cutting out intermediaries and keeping close relationships with their funding sources. Most nonfinancial corporations go the other way, using investment banks as dealers to market notes across the dealer’s network of buyers.
Dealer fees are smaller than most people expect. Federal Reserve data shows dealer spreads of roughly 1 to 6 basis points (a basis point is 0.01%), depending on the issuer’s credit quality and bargaining power. For highly rated financial issuers, the average spread on individual transactions runs about 2 basis points.9Federal Reserve. Dealer Intermediation in the Primary Market of Commercial Paper Lower-rated nonfinancial issuers pay more.
On the buyer side, money market funds, pension funds, insurance companies, and corporate treasurers dominate. These institutions use commercial paper to park cash for short periods while earning a return that edges above Treasury bills. As of late March 2026, AA-rated nonfinancial commercial paper yielded around 3.7% for 30-day maturities, while lower-rated A2/P2 paper paid closer to 4.2% for the same term.10Federal Reserve. Commercial Paper Rates and Outstanding Summary
How Investors Earn a Return
Commercial paper is almost always sold at a discount from its face value. Buy a $1 million note maturing in 90 days for $990,000, and you receive the full $1 million at maturity. The $10,000 difference is the return. No separate interest payments are made during the life of the note. The size of the discount depends on prevailing interest rates, the issuer’s credit quality, and the note’s maturity.
For federal tax purposes, the discount is treated as ordinary income rather than a capital gain. The IRS classifies the difference between purchase price and face value as original issue discount (OID), a form of interest income.11Internal Revenue Service. Topic No. 403, Interest Received Because most commercial paper matures within a single tax year, the full discount is typically reported in the year the face value is received. Investors who hold commercial paper through a money market fund see this income reflected in the fund’s dividend distributions and don’t deal with OID calculations directly.
Asset-Backed Commercial Paper
Not all commercial paper is unsecured. Asset-backed commercial paper (ABCP) is issued by a special purpose vehicle, essentially a shell entity created by a bank or financial company, that holds a pool of assets like trade receivables, auto loans, or commercial loans. Cash flows from those assets support repayment of the paper. This structure lets the sponsoring bank move assets off its balance sheet while still earning management fees.
The key difference from traditional commercial paper is the collateral. Investors aren’t relying solely on an issuer’s promise to pay; they have a claim against a pool of income-producing assets. The collateral isn’t always as solid as it sounds, though. ABCP conduits typically require additional credit enhancement from the sponsoring bank, often a committed credit line covering the full amount of outstanding paper. When the underlying assets perform well, investors never see the backup support. When asset quality deteriorates, the sponsoring bank absorbs the first losses.
ABCP made up a substantial portion of the market before the 2008 financial crisis. Its share has diminished since, but it remains a significant segment. As of March 2026, AA-rated asset-backed paper yielded around 3.8% to 3.9% for 30-to-90-day maturities.10Federal Reserve. Commercial Paper Rates and Outstanding Summary
Rollover Risk and Market Disruptions
The biggest structural vulnerability in the commercial paper market is rollover risk. Because most notes mature in 30 days or less, issuers constantly need to sell new paper to repay the paper that’s coming due. As long as investors keep buying, the cycle runs smoothly. When confidence breaks, the market can seize up fast.
The 2008 financial crisis showed what that looks like. When Lehman Brothers filed for bankruptcy in September 2008, the Reserve Primary Fund, a money market fund managing over $65 billion, disclosed that it held more than $785 million in Lehman commercial paper. A run on that fund spread to other money market funds and triggered a broader exodus from commercial paper. Financial commercial paper outstanding dropped nearly 30% in six weeks, falling from $806 billion to $568 billion between September and October 2008.8Berkeley Law. When Safe Proved Risky: Commercial Paper During the Financial Crisis of 2007-2009
The Federal Reserve responded by creating the Commercial Paper Funding Facility (CPFF), which purchased three-month commercial paper directly from eligible issuers. By the end of 2008, the Fed had bought $335 billion in paper through the program. The CPFF was reactivated in March 2020 during the COVID-19 market disruption under Section 13(3) of the Federal Reserve Act, and it ceased operations in March 2021.12Federal Reserve. Commercial Paper Funding Facility The Fed has now deployed this tool twice in twelve years, which says something about the fragility of a market that depends on continuous investor confidence.
How It Compares to Other Short-Term Instruments
Weighing commercial paper against alternatives comes down to three practical differences from Treasury bills. T-bills are backed by the full faith and credit of the U.S. government; commercial paper carries the credit risk of a private corporation. That extra risk means commercial paper typically pays a higher yield. And the secondary market for commercial paper is thinner than the Treasury market, so selling a note before maturity may be harder or require accepting a small price concession.
Against certificates of deposit, commercial paper offers more flexibility on maturity dates but lacks FDIC insurance. Against repurchase agreements, commercial paper is unsecured unless it’s ABCP, which means the investor bears more credit risk but avoids the operational complexity of managing collateral. For most institutional cash managers, the question is whether the yield premium on commercial paper justifies the credit exposure compared to government-backed alternatives.