The Wash Sale Rule Explained: How to Avoid This Costly Trading Trap

Here's the mechanic that turns an ordinary tax annoyance into a real, permanent loss of money. The wash sale rule applies across every account you or your spouse own, not just the one where you made the trade. That includes a taxable brokerage account, a joint account, and any IRA, Traditional or Roth.

The IRS settled this specifically in Revenue Ruling 2008-5. Sell a security at a loss in your taxable account, and have your IRA buy substantially identical shares within the 61-day window, and the loss is disallowed exactly as if you'd bought it back in the same taxable account. Except there's no fix available. Shares inside an IRA have no cost basis for capital gains purposes at all, since nothing inside the account is ever taxed as a capital gain or loss in the first place. There's nowhere for the disallowed loss to go. It's simply gone.

Play that out with real numbers. You sell 200 shares of a stock in your taxable account for a $4,000 loss. Three weeks later, your Roth IRA, funded by a scheduled contribution you set up at the start of the year, buys the same stock. That $4,000 loss is disallowed under Revenue Ruling 2008-5, permanently. In the 24% federal bracket, that's roughly $960 in tax savings that simply never happens, not deferred to next year, not recoverable any other way.

The IRS has also indicated that a wash sale can occur across spouses: one spouse selling at a loss while the other buys the same security shortly after can trigger the rule too. And your broker can't save you here. Brokers only track wash sales within a single account on your Form 1099-B. They have zero visibility into your other accounts, your spouse's accounts, or your IRA. Catching a cross-account wash sale before it costs you money is entirely your job, especially if you or your household run automatic contributions, dividend reinvestment, or scheduled purchases into any retirement account that might overlap with something you traded elsewhere.

Buying back the exact same stock is obviously identical. Beyond that, the line gets blurrier, and it's worth knowing where.

Options on the same underlying stock count. Buying a call, or selling an in-the-money put, on a stock you just sold at a loss is treated as acquiring a substantially identical position and will trigger the rule. Bonds from the same issuer with similar maturity and coupon terms are generally treated as identical too. Different share classes of the same company, if they carry similar rights, usually are as well.

The genuinely gray area is similar ETFs. Selling an S&P 500 ETF at a loss and buying a different provider's S&P 500 ETF is risky territory. They're technically distinct securities, but the IRS hasn't issued definitive guidance, and their near-identical performance gives an examiner real room to argue they're substantially identical anyway. Swapping into an ETF tracking a genuinely different index, moving from an S&P 500 fund into a Nasdaq 100 fund, for example, is the safer move if you want to stay invested in roughly the same market without the ambiguity.

A dividend reinvestment plan can trigger a wash sale without you making a single deliberate trade, since an automatic repurchase counts exactly the same as a manual one. This is precisely what happened in the IRA scenario that opened this article, and it's worth checking whether any of your accounts have DRIPs or scheduled contributions running quietly on autopilot.

Being assigned on a short put, or exercising a long call, also counts as acquiring the underlying stock. An assignment you didn't initiate, on a stock you happened to sell at a loss recently, can trigger the rule with zero deliberate action on your part. And late-December loss sales are particularly disruptive for tax planning specifically, since a repurchase in early January pushes the disallowed loss into the following tax year, potentially wrecking a deduction you were counting on landing in the current one.

Not currently. The IRS classified virtual currency as property, not a security, in Notice 2014-21, and the wash sale rule under IRC Section 1091 applies specifically to stock and securities. Property that isn't a security falls outside the rule entirely, which means selling Bitcoin, Ethereum, or another directly held crypto asset at a loss and buying it straight back carries no wash sale consequence as of 2026.

This isn't a permanent feature of the tax code, just the current state of it. Congress has repeatedly proposed extending wash sale treatment to digital assets, and none of those proposals have passed as of this writing. Crypto ETFs and crypto-related stocks are a different story entirely: those are securities in their own right, and the wash sale rule applies to them exactly like any other stock or ETF. The full picture of how crypto trading gets taxed is covered in the crypto day trading taxes guide.

Start with the accounts you might be forgetting about. If you or your spouse run any automatic investing, DRIPs, scheduled IRA contributions, robo-advisor rebalancing, in an account that might hold the same securities you actively trade elsewhere, that's exactly the setup that produced the opening story of this article. Either pause automatic purchases around a planned loss sale, or check what they'll buy before you sell anything at a loss.

For a deliberate loss sale in a taxable account, the simplest fix is patience: wait a full 31 days after the sale before buying the same security back anywhere. If you want to stay invested in the same theme without waiting, buy something similar but not substantially identical, a different stock in the same sector, or an ETF tracking a clearly different index, and you stay outside the rule's reach entirely.

For traders who've qualified for Trader Tax Status, there's a permanent structural fix rather than a habit to maintain. Electing Section 475(f) mark-to-market accounting converts your trading securities from capital assets to ordinary assets, and the wash sale rule only ever applied to capital assets in the first place. Once that election is properly in effect, documented correctly, since a botched election helps nobody, the rule simply stops touching your covered trades, at the cost of giving up long-term capital gains treatment on anything you might otherwise have held past a year.