Short selling is a trading strategy where an investor borrows shares, sells them on the market, and later repurchases them at a lower price to return to the lender, profiting from the price decline.
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Typically, investors short stocks they do not own when they expect the stock price to drop.
However, an older and now largely obsolete strategy, known as “shorting against the box,” involved shorting a stock while also owning it.
At first glance, this seems contradictory—why would an investor bet against their own holdings?
Historically, this strategy was used to defer capital gains taxes, hedge against market volatility, and manage portfolio risk.
However, due to regulatory changes, tax law updates primarily led by the US, and more efficient hedging methods, shorting a stock you already own no longer serves its original purpose in most major financial markets.
This article will explore how shorting a stock you own works, why investors used to do it, and why it has largely fallen out of use in modern markets.
Shorting a stock that an investor already owns historically involved a strategy called “shorting against the box.”
This meant simultaneously holding a long position (owning the stock) and opening a short position (borrowing and selling the same stock). The result was a neutralized exposure to price movements, meaning no gains or losses from the stock’s price fluctuations.
To understand how this strategy worked, let’s first break down traditional short selling:
Now, when an investor already owns the stock and shorts it simultaneously, the situation changes. The long position and the short position cancel each other out, meaning that any price movement in the stock results in neither a profit nor a loss.
For example:
This means that shorting a stock you already own does not generate a profit from a decline in price, unlike regular short selling. The entire point of the strategy was to “lock in” gains or losses without exiting the position outright.
In the US, yes. Shorting against the box is considered illegal for tax avoidance purposes under the Taxpayer Relief Act of 1997, meaning that if you attempt to use this strategy to defer capital gains taxes, it will be considered a taxable event and you could face penalties.
Before 1997, U.S. investors used shorting against the box to defer capital gains taxes. Instead of selling shares and triggering a taxable event, investors could short the stock they owned, effectively locking in gains without officially selling.
They could then close the position in a later tax year, deferring the capital gains tax liability.
However, the Taxpayer Relief Act of 1997 closed this loophole. The IRS now considers shorting against the box a “constructive sale,” meaning unrealized gains are taxed as if the investor had sold the stock outright. This effectively eliminated the tax benefit that once made this strategy attractive.
Today, investors in the U.S. can no longer use this method to defer capital gains taxes, making the strategy largely obsolete as a tax-deferral tool.
It still exists today in certain specialized contexts, particularly among institutional investors in other countries, however.
Although tax deferral is no longer a valid reason, some institutional investors and hedge funds still engage in this practice for hedging, arbitrage, or regulatory compliance reasons.
Even in these scenarios, shorting against the box has largely been replaced by more efficient financial instruments, such as options, swaps, and synthetic positions.
Most brokers do not allow retail investors to short against the box because:
Because of these limitations, many brokers simply do not permit this type of trade anymore.
With shorting against the box now largely obsolete due to regulatory restrictions and tax law changes, investors seeking risk management solutions have turned to more efficient hedging strategies.
These modern alternatives allow investors to protect their portfolios, hedge against declines, and manage capital gains exposure—without the drawbacks of shorting a stock they own.
Below are some of the most effective hedging strategies used today.
One of the most common and efficient ways to hedge a stock position is buying put options. A put option gives the investor the right (but not the obligation) to sell a stock at a predetermined price (strike price) before the option expires.
If the stock declines, the put option increases in value, offsetting the losses from the long position.
An investor owns 1,000 shares of Company X at $100 per share. They buy put options with a $95 strike price expiring in three months. If the stock drops to $80, the put option gains value, offsetting the losses from the long position. If the stock price rises, the put expires worthless, but the investor still benefits from holding the stock.
This makes put options a preferred method for investors who want to protect against short-term volatility without giving up long-term stock ownership.
A protective collar is a strategy that combines buying a put option with selling a covered call option. This allows investors to hedge downside risk at a lower cost than simply buying a put option.
This strategy is commonly used by long-term investors who want downside protection without fully exiting their position.
Rather than shorting individual stocks, many investors hedge risk by diversifying their portfolios across different asset classes and sectors. This approach reduces exposure to any single stock or market downturn.
For most long-term investors, proper diversification is often the best and simplest hedge against market volatility.
Inverse Exchange-Traded Funds (inverse ETFs) are designed to move in the opposite direction of a specific stock index. Investors can use these funds to hedge against market downturns without shorting individual stocks.
For example:
While not a perfect hedge, inverse ETFs offer a way to bet against the market without needing a margin account or options trading approval.
If an investor expects moderate downside risk but does not want to fully hedge their stock, they can sell covered call options against their long position.
Covered calls are a good strategy for hedging mild volatility while still collecting income but are not a strong hedge for severe price drops.
For more thorough guidance, please seek the services of a financial planner.