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Cost to Borrow
Cost to borrow is the annual fee a short seller pays to borrow shares, quoted as a percentage of the position's value and charged a little each day the short stays open. A high fee means the shares are scarce. It doesn't mean the shorts are trapped.
What the fee is
To short a stock you sell shares you don't own, so someone has to lend them to you. Cost to borrow is the rent on those shares. It's quoted as an annual rate, but nobody bills you once a year. The fee accrues every day the short is open, based on the current value of the borrowed shares, and your broker takes it out of the account, usually monthly.
Most large, liquid stocks borrow for a fraction of a percent a year, which is close enough to free that most short sellers never think about it. The interesting names are the ones where the rate runs into double or triple digits. At that point the fee stops being a rounding error and becomes the main cost of the trade.
How the daily charge works
Daily fee = market value of the short x annual rate / 360
Many US brokers divide by 360. Some use 365. Check your broker's statement before you trust any estimate, ours included. Example numbers only:
| Example short value | Annual rate (example) | Fee per day | Fee over 30 days |
|---|---|---|---|
| $10,000 | 0.3% | $0.08 | $2.50 |
| $10,000 | 5% | $1.39 | $41.67 |
| $10,000 | 50% | $13.89 | $416.67 |
| $10,000 | 200% | $55.56 | $1,666.67 |
The table assumes the price and rate never change. In real life both move. If the stock rises 20% against you, that $10,000 short is now worth $12,000, so the daily fee at 100% goes from about $27.78 to $33.33. The fee grows exactly when the trade is already hurting. That's the part people underestimate.
Who sets it
Lenders and brokers do. Shares come from broker inventory, from customer margin accounts, and from institutions that lend out their holdings for extra income. The rate is a price for a scarce thing: when lots of people want to borrow and few shares are available, it climbs. Your broker then adds its own markup, which is why two brokers can quote different rates on the same stock on the same morning. Rates can also change daily, and a rate you saw at the open isn't promised for tomorrow.
How borrow and utilization interact
Utilization is the share of the lendable supply that's already on loan. When it's low, there are plenty of shares to go around and the fee stays cheap. As utilization climbs toward 100%, the remaining shares get pricey fast, and new shorts may not be able to borrow at all. That's when a name usually lands on the hard-to-borrow list.
Here's how it fails as a signal. A very high fee tells you shorting is expensive and crowded. It doesn't tell you who will blink. Shorts with a strong view will pay a fat fee for a while, and a lender recall or a new share offering can change the picture overnight. A fee is not a squeeze. Read it alongside short interest, float and days to cover.
FAQ
Is cost to borrow charged daily or annually?
It's quoted annually and charged daily on the current value of the short. Most brokers total it up and debit it monthly.
Why is my borrow rate different from what a data site shows?
Data sites usually show an estimated market rate. Your broker charges its own rate, which depends on its supply and its markup. Your broker's number is the one you pay.
Does a high borrow fee mean a squeeze is coming?
No. It means shares are scarce and shorting is expensive. A squeeze needs the price to move against the shorts hard enough that they cover. High fees can sit for weeks with nothing happening.
Can the fee change while I'm short?
Yes. Rates can reset daily, and the charge follows the current value of the shares. A rising stock and a rising rate together can make a short very expensive in a short time.
For how shorting and squeezes connect in practice, see our lesson on short selling and squeezes and the squeeze metrics reference.
This page is education, not financial advice.