Commercial paper is a short IOU issued by a large, trusted company.

It usually comes due in one to three months, sometimes just days.

Firms use it to cover payroll, inventory, and other short-term needs, rolling it over again and again.

The U.S. commercial paper market held around $1.3 trillion in mid-2025.

2025 brought the heaviest new issuance in nearly two decades.

Household names like Coca-Cola, PepsiCo, and Netflix borrow here.

Money market funds are among the biggest buyers.

At each quarter-end, like June 30, this market gets tighter as lenders pull back.

A firm sells paper today and promises to repay in, say, 60 days.

Before that day comes, it usually sells new paper to repay the old.

This rolling is cheap and easy when lenders are calm.

The firm never really pays down the debt; it refinances it over and over.

That works only as long as buyers keep showing up.

If they stop, the firm must find cash fast or draw a backup bank line.

The first stress point is rollover risk. If buyers vanish, the firm cannot refinance.

That is exactly what froze in 2008, when the paper market seized and the Fed had to step in.

The second is the buyer base. Money funds dominate, so their moods move the market.

The third is quarter-end. Lenders tidy their books, funding gets scarce, and rates pop.

A firm that leans too hard on paper can get caught when the window narrows.

For strong firms, commercial paper is cheap, flexible funding, and it works smoothly most of the time.

That efficiency is real and deserves credit.

What can break is rollover in a panic, when even good firms cannot sell new paper.

You can watch the market yourself. The Fed publishes commercial paper outstanding and rates every week.

A sudden drop in outstanding paper, or a jump in rates, signals buyers pulling back.

Commercial paper is a rollover machine: cheap and smooth until the day buyers stay home.

For blue-chip firms it is sound. The risk is refinancing at the exact moment cash gets scarce.

The next test is any funding squeeze or quarter-end crunch. Watch weekly paper outstanding and rates.