A wash trade is a transaction in which the same person or entity is effectively on both sides, so beneficial ownership never actually changes. In securities and commodities markets, wash trades are a form of illegal market manipulation carrying prison time and heavy fines. In tax law, the IRS uses a related concept — the “wash sale” rule — to block you from deducting a loss when you sell a security and buy it right back. Same name, different consequences, and confusing the two trips up investors regularly.
How a Wash Trade Works
The defining feature is that no one gives up the position. In a real transaction, one party surrenders an asset and another takes it on, along with the risk and reward of owning it. A wash trade skips that step. The same person ends up holding the same position after the trade closes, and the only thing produced is a record that something happened.
In practice, this usually means trading between two accounts controlled by the same person, or coordinating with a partner to swap shares back and forth at pre-arranged prices. Because price and quantity are set in advance, nobody bears market risk. The trade bypasses the competitive bidding that makes prices meaningful. No wealth changes hands, and the only output is a line on an exchange’s trade log.
Why People Wash Trade
The usual goal is to fabricate volume. When a stock or digital asset shows high trading volume, other investors read that as genuine interest and liquidity, which draws in real money. By trading with themselves hundreds or thousands of times, wash traders manufacture that appearance from nothing. The tactic is sometimes called “painting the tape.”
Real investors pile in based on the inflated data, the artificial activity stops, and the price collapses. In a 2025 SEC enforcement action, a trader was found to have executed more than 11,000 wash trades involving roughly three million options contracts to collect liquidity rebates from exchanges, generating hundreds of thousands of dollars in illegal profits before being permanently enjoined from further violations.1U.S. Securities and Exchange Commission. Suyun Gu, et al.
NFT marketplaces have become especially fertile ground. Because blockchain transactions are pseudonymous and many platforms lack surveillance, one person can create multiple wallets and trade an NFT back and forth to inflate its apparent value. Warning signs include an NFT selling multiple times in a single day, the same wallet appearing repeatedly on both sides, and collections showing high volume but almost no unique traders.
Federal Laws That Prohibit Wash Trading
Two separate statutory regimes apply depending on the asset.
For securities, Section 9(a)(1) of the Securities Exchange Act of 1934 makes it illegal to execute a transaction involving no change in beneficial ownership for the purpose of creating a false appearance of active trading.2Office of the Law Revision Counsel. 15 USC 78i – Manipulation of Security Prices The statute also covers matched orders, where a buyer and seller coordinate identical orders at the same price and time to simulate genuine trading.
For commodity futures and swaps, Section 6c(a) of the Commodity Exchange Act flatly prohibits any transaction “of the character of, or commonly known to the trade as, a ‘wash sale’ or ‘accommodation trade,'” along with any fictitious sale used to report a price that isn’t genuine.3Office of the Law Revision Counsel. 7 USC 6c – Prohibited Transactions The SEC and CFTC both enforce these prohibitions in their respective markets.
Criminal Penalties
A willful violation of the Securities Exchange Act carries fines up to $5 million and up to 20 years in prison for an individual. For entities like corporations or funds, the fine ceiling rises to $25 million.4Office of the Law Revision Counsel. 15 USC 78ff – Penalties In a 2024 DOJ prosecution targeting cryptocurrency market manipulation, defendants faced charges combining market manipulation (up to 20 years), wire fraud (up to 20 years), and conspiracy (up to five years), with fines up to $5 million or twice the gross gain from the offense.5United States Department of Justice. Eighteen Individuals and Entities Charged in International Operation Targeting Widespread Fraud and Manipulation in the Cryptocurrency Markets
Civil Penalties
The SEC can also bring civil actions under Section 21(d)(3) of the Exchange Act, which sets a three-tier penalty structure.6Office of the Law Revision Counsel. 15 USC 78u – Investigations and Actions Wash trading typically falls under the highest tier because it involves fraud and causes substantial losses to other investors. Under the SEC’s 2025 inflation adjustment, top-tier civil penalties reach $236,451 per violation for individuals and $1,182,251 per violation for entities, or the gross amount of profit gained, whichever is greater.7U.S. Securities and Exchange Commission. Adjustments to Civil Monetary Penalty Amounts Courts can also order disgorgement of all profits from the manipulation.
The IRS Wash Sale Rule Is a Different Thing
Separately, the IRS has a “wash sale” rule under Section 1091 of the Internal Revenue Code. It targets a different behavior: selling a stock or security at a loss for the tax deduction, then buying it right back to keep the same investment position. The IRS treats that as a paper loss rather than a genuine change in your portfolio.
The rule applies if you sell a security at a loss and acquire a “substantially identical” security within a 61-day window: 30 days before through 30 days after the sale.8Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities The trigger includes purchases, exchanges, and even entering into a contract or option to acquire the replacement. When it applies, you cannot deduct the loss on your current return.
The loss usually isn’t gone forever. The disallowed amount gets added to your cost basis in the replacement security, so you’ll eventually recognize a larger loss (or smaller gain) when you sell that replacement without triggering another wash sale.9eCFR. 26 CFR 1.1091-1 – Losses From Wash Sales of Stock or Securities The tax benefit is deferred, not eliminated. Retirement accounts are the major exception, discussed below.
The rule also applies to short sales. If you close a short position at a loss and then sell short (or buy) substantially identical securities within the same 30-day window on either side, the loss is disallowed under Section 1091(e).
What Counts as Substantially Identical
The IRS has never published a bright-line test, and this ambiguity catches people off guard. IRS Publication 550 says you must consider “all the facts and circumstances.”
Some cases are clear. Selling 100 shares and buying 100 shares of the same stock is a wash sale. Buying a call option on the same stock you just sold at a loss also triggers the rule, because the option gives you the right to reacquire the identical position. Convertible preferred stock can be treated as substantially identical to the common stock if both trade in lockstep with the conversion ratio.
The gray area lives in mutual funds and ETFs. The general IRS position is that shares of one mutual fund are “ordinarily” not substantially identical to shares of a different fund, even if both track the same index. But two S&P 500 index funds with nearly identical holdings and returns that mirror each other push the boundary, and no IRS ruling has directly addressed that scenario. Cautious investors selling an index fund at a loss typically buy a fund tracking a different index for the replacement.
The Retirement Account Trap
This is where the rule can cause permanent damage. If you sell a stock at a loss in your regular brokerage account and then buy substantially identical shares inside your IRA or Roth IRA within the 61-day window, Section 1091 still disallows the loss. But the usual remedy of adding the disallowed loss to your replacement shares’ basis doesn’t work in a retirement account.10IRS. Revenue Ruling 2008-5 – Loss From Wash Sales of Stock or Securities
Revenue Ruling 2008-5 holds that your IRA’s basis is not increased when a wash sale loss gets disallowed. Since you can’t adjust the cost basis of holdings inside a tax-deferred account the way you can in a taxable account, the loss simply vanishes. You lose the deduction now and never recover it later. If you manage positions across taxable and retirement accounts, watch the timing of any IRA purchases during the 61-day window around a taxable loss sale.
Reporting a Wash Sale on Your Tax Return
When a wash sale occurs, report it on Form 8949 using code “W” in column (f) and enter the disallowed loss as a positive number in column (g).11IRS. Instructions for Form 8949 – Sales and Other Dispositions of Capital Assets That adjusts the gain or loss flowing through to Schedule D.
Your broker will flag wash sales that happen within the same account on Form 1099-B, box 1g. But brokers are only required to track wash sales within a single account. If the triggering purchase happens in a different account, even at the same brokerage, the 1099-B won’t reflect it, and the IRS still expects you to report the wash sale. Investors who hold the same securities across multiple accounts, or who trade in both taxable and retirement accounts, bear the burden of tracking cross-account wash sales themselves.
Cryptocurrency Is Not Covered — Yet
As of early 2026, cryptocurrency and other digital assets are not subject to the wash sale rule under Section 1091. The IRS classifies crypto as property rather than a “stock or security,” and Section 1091 applies only to stock and securities. You can sell Bitcoin at a loss, buy it back immediately, and still claim the deduction.
That gap may not last. The IRS finalized digital asset broker reporting regulations in 2024, requiring brokers to report gross proceeds starting in 2025 and cost basis for later transactions. Legislative proposals to extend the wash sale rule to digital assets have circulated in Congress for several years. If you’re relying on this exception for tax-loss harvesting, watch annual tax law changes closely.
The market manipulation prohibition is a different matter. Wash trading crypto to inflate volume is still fraud, and the DOJ has prosecuted it aggressively. The 2024 case charging 18 individuals and entities with cryptocurrency market manipulation specifically targeted wash trading used to fake demand for tokens.5United States Department of Justice. Eighteen Individuals and Entities Charged in International Operation Targeting Widespread Fraud and Manipulation in the Cryptocurrency Markets
How Exchanges Try to Stop Wash Trades
Modern exchanges use automated self-trade prevention (STP) systems that block wash trades before they execute. When an incoming buy order and a resting sell order share the same identifier (same account, same firm, or same beneficial owner) the system cancels one side before a match occurs. These tools help honest firms avoid accidental self-trades in fast-moving markets, but they’re no defense for someone deliberately wash trading through separate brokers or off-exchange venues, and firms remain fully responsible for compliance regardless of whether they use them.
One Narrow Exception for Dealers
Section 1091 carves out one narrow exception from the tax wash sale rule: dealers in stock or securities can deduct wash sale losses if the loss comes from a transaction made in the ordinary course of their dealing business. Retail investors don’t qualify.