How to short a stock. Step by step.

Short selling is mechanically straightforward at any broker that supports it. The hard part is the discipline (covered in the short selling stocks post). This page is the practical walkthrough of the order entry mechanics, the regulatory steps, and the position management for retail traders shorting at major brokers.

Step one. Open a margin account

Short selling requires a margin account. Cash accounts cannot short. Standard margin account suffices for most retail short selling.

Apply for the margin account at a broker that supports short selling. Most brokers require completing a margin application that asks about trading experience, financial situation, and risk tolerance. Approval is typically within a few business days.

Minimum account size for short selling is the same as the standard pattern day trader threshold ($25,000) for active short selling, though individual short positions can be smaller if the trader stays under the day trade limit.

Step two. Verify the broker supports shorting the specific stock

Not every stock can be shorted at every broker. The broker needs shares available to borrow before allowing a short sale. Some stocks (hard to borrow) have limited inventory. Others (penny stocks, recent IPOs, certain volatile names) may not be shortable at all at retail brokers.

The broker's order entry screen typically shows whether shares are available. If the locate fails, the order is rejected.

Interactive Brokers generally has the deepest borrow inventory and supports shorting more stocks than smaller brokers.

Step three. Place the short sell order

Navigate to the order entry screen. Search for the stock ticker.

Select sell short as the order type. Some brokers label this differently (Sell, then a separate flag indicating short, or simply Short).

Enter the number of shares to short. The broker will check margin requirements and locate availability before accepting the order.

Choose order type. Limit order is recommended for most short entries. Specify the limit price at the current bid (for an immediate fill) or slightly above (to wait for a better price).

Time in force. Day order for intraday shorts. GTC (good till cancelled) for swing shorts.

Submit the order.

Step four. The fill and the cash

When the short fills, the broker borrows the shares from its inventory or from another customer's margin account. The shares are sold immediately at the fill price.

The cash from the sale appears in the account as proceeds. This cash is held as collateral against the short position. It cannot be withdrawn while the short is open.

The position shows in the account as a negative share quantity. 100 shares short shows as -100.

Step five. The daily mechanics

Daily borrow fee.

The broker charges a daily fee for the borrowed shares. The fee is the annualized cost to borrow divided by 365. A 10 percent annualized CTB on $10,000 shorted is roughly $2.75 per day.

The fee accrues daily and is debited from the cash balance. Long held shorts on hard to borrow stocks accumulate meaningful fees.

Mark to market.

The position is valued at the current market price daily. Unrealized gains or losses show in the account equity.

Margin maintenance.

The maintenance margin for shorts is typically 30 percent. If the equity in the account falls below this threshold, a margin call is issued.

Recall risk.

The broker can recall the borrowed shares at any time. If recalled, the broker may force close the short or locate replacement shares. This rarely happens at major brokers but is possible especially on hard to borrow names.

Step six. Close the short with a buy to cover

To close the short, the trader buys back the shares. The order type is "buy to cover" on most brokers (some just say buy and detect the short close automatically).

The shares are returned to the lender. The cash collateral is released. The profit or loss is the difference between the original sell price and the buy back price, minus the cumulative borrow fees and commissions.

If the trader bought back at a lower price, the difference is profit. If at a higher price, the difference is a loss.

The costs of shorting

Commission.

Most major brokers charge $0 commission on stock orders including shorts.

Borrow fee.

Annualized cost to borrow charged daily. Easy to borrow stocks cost under 1 percent annualized. Hard to borrow can reach 10 to 100 percent.

Margin interest.

If the short uses additional borrowing beyond the cash collateral, margin interest applies. Typical rates 7 to 13 percent annualized depending on broker.

Dividend payment.

If the shorted stock pays a dividend during the short, the short seller owes the dividend amount to the original share lender. The dividend is debited from the account on the ex date.

The regulatory checks

Reg SHO locate requirement.

The broker must locate borrowable shares before allowing the short. The broker confirms this at order entry.

Threshold security list.

Stocks with persistent settlement failures (fails to deliver) get added to the SEC's threshold security list. Shorts on these names face additional restrictions including mandatory close out after settlement failures.

SEC Rule 201 (alternative uptick rule).

Stocks that have dropped 10 percent or more from the prior close can only be sold short at prices above the highest current bid. The rule slows aggressive shorting during declines.

Naked short selling ban.

Selling short without first borrowing the shares (naked shorting) is generally prohibited for retail. The locate requirement enforces this.

The broker comparison

Interactive Brokers.

Best for shorting. Deepest borrow inventory. Lowest borrow fees on hard to borrow names. Direct routing options.

Schwab (and inherited TD Ameritrade ThinkOrSwim).

Solid all around. Good borrow inventory. Standard borrow fees.

Fidelity.

Similar to Schwab. Reliable for standard shorting.

Webull.

Supports shorting on liquid names. Inventory more limited than the major brokers.

Robinhood.

Does not support direct stock shorting. Inverse ETFs (SQQQ, SPXS) can be used as a workaround for limited bearish exposure.

E*Trade and Merrill Edge.

Support shorting on liquid names. Standard inventory.

The common mistakes

Trying to short on Robinhood without realizing it is not supported. The order entry shows sell but actually closes existing long positions or fails. Use a different broker for direct shorts.

Forgetting about the borrow fee. The trader holds a short for months and is surprised by the accumulated borrow cost. Track the daily fee and factor it into the trade math.

Holding through ex dividend. The short seller owes the dividend. Surprise debit on the ex date. Plan around dividend dates.

Using market orders on illiquid shorts. The fill can be meaningfully worse than the displayed quote. Use limit orders.

Ignoring the recall risk on hard to borrow names. The broker can force close at any time. Position size accordingly.

Where the audit fits

The audit reads the actual short entries and shows whether the discipline rules are being followed or whether the trader is taking marginal shorts that produce losses. For most retail short sellers the pattern is shorting recent momentum names that squeeze. The plan locks the rules from the short selling stocks post. Five to seven pages.