Open P&L is the unrealized profit or loss on a trade you haven’t closed yet. It represents how much you would gain or lose if you sold your position right now at the current market price. The number fluctuates constantly as the market moves, and it only becomes “real” once you actually sell or close the trade.
How Open P&L Is Calculated
The math behind open P&L is straightforward: take the difference between your entry price and the current market price, then multiply by the size of your position.
If you bought 100 shares of a stock at $50 and it’s now trading at $55, your open P&L is $500 (100 shares × $5 gain). If the price drops to $47, your open P&L becomes negative $300 (100 shares × $3 loss). The same logic applies to forex, futures, options, and crypto. In forex, for example, a 100,000-unit position that moves 15 pips in your favor at $0.0001 per pip produces an open profit of $150.
Your trading platform typically calculates this for you in real time, updating as the market ticks. Some platforms label it “unrealized P&L,” “floating P&L,” or simply “open P&L.” They all mean the same thing: money you haven’t locked in yet.
Open P&L vs. Realized P&L
The distinction matters for practical and tax reasons. Open P&L exists only on paper. It can grow, shrink, or flip from profit to loss at any moment. Realized P&L is the final number you get after closing a trade. Once you sell or exit the position, the gain or loss is locked in and can’t change.
Think of it this way: if you bought a house for $300,000 and a neighbor’s similar home just sold for $350,000, you have an unrealized gain of roughly $50,000. You haven’t actually made that money until you sell your house. The same principle applies to stocks, bonds, currency pairs, or any other tradeable asset. Until you hit the sell button, your profit is theoretical.
This also means open profits can vanish. A position showing $2,000 in open profit on Monday could show $800 by Friday if the market reverses. Traders who treat open P&L as money already earned sometimes hold too long and watch gains evaporate.
How It Affects Your Account Balance
Even though open P&L isn’t “real” yet, it directly impacts how much buying power you have in your account. Most brokerages use a process called mark-to-market, which recalculates the value of your open positions at the end of each trading day (or continuously, depending on the platform). Your account equity equals your cash balance plus or minus your open P&L on all positions.
This matters especially if you trade on margin, meaning you’ve borrowed money from your broker to take larger positions. Brokers require you to keep a minimum level of equity in your account, known as the maintenance margin. If your open losses drag your equity below that threshold, the broker issues a margin call, requiring you to deposit more funds or close positions. For example, if you have $10,000 in equity and the maintenance margin is 25%, your equity can’t fall below $2,500. A string of open losses that pushes you past that line forces action whether you’re ready or not.
Open profits work in your favor here. If your positions are up, your equity increases, giving you more room to open new trades or absorb losses elsewhere in your portfolio.
Tax Treatment of Open P&L
You do not owe taxes on open P&L. Because no sale has occurred, the IRS does not consider unrealized gains to be taxable income. You also cannot claim unrealized losses as deductions. Taxes only enter the picture once you close the trade and realize the gain or loss.
When you do close a position, the holding period determines your tax rate. Investments held for more than a year are taxed at long-term capital gains rates of 0%, 15%, or 20%, depending on your income. Investments held for less than a year are taxed at your ordinary income tax rate, which is typically higher.
This creates a planning opportunity. As long as a position stays open, you defer any tax obligation. Some investors intentionally hold winning positions past the one-year mark to qualify for the lower long-term rate. Of course, the tradeoff is market risk: holding longer to save on taxes means your open P&L could decline before you sell.
Why Traders Watch Open P&L Closely
Open P&L is one of the first numbers traders check because it captures how their active positions are performing right now. It helps answer basic but important questions: Is my strategy working today? Am I approaching a level where I should take profits? Am I close to my maximum acceptable loss?
Many traders set rules around open P&L to manage risk. A common approach is using stop-loss orders that automatically close a position if the open loss hits a predefined amount. Others set profit targets that trigger a sell when open gains reach a certain level. Without these guardrails, it’s easy to let emotions drive decisions, holding losers too long hoping for a recovery, or closing winners too early out of fear the market will reverse.
Portfolio-level open P&L is equally useful. If you have ten positions open, looking at the combined open P&L tells you whether your overall exposure is working in your favor or against you. A portfolio showing large aggregate open losses may signal that you’re overexposed to a sector or direction that’s moving against you, prompting rebalancing before the losses become realized.