Wash Sale Rule Explained for Traders

The wash sale rule catches active traders more than any other group, precisely because frequent buying and selling of the same or similar securities is exactly what triggers it.

Part 1. What the Wash Sale Rule Actually Prohibits

The IRS disallows a tax loss deduction if you sell a security at a loss and buy the same or a "substantially identical" security within 30 days before or after the sale (a 61-day window total). Instead of being deductible immediately, the disallowed loss is added to the cost basis of the replacement position.

Part 2. Why Active Traders Get Caught by This So Often

A trader who sells a losing position and re-enters the same stock within days — a completely normal part of active trading — can unintentionally trigger wash sale treatment repeatedly throughout the year, deferring rather than eliminating losses, and complicating tax reporting significantly.

Part 3. "Substantially Identical" Is Broader Than Just the Same Ticker

The rule can also apply to options on the same underlying, or securities considered economically equivalent — not just an exact repurchase of the identical stock. This nuance catches traders who think switching from shares to options on the same company avoids the rule.

Part 4. The Mark-to-Market Election (Section 475(f))

Traders who qualify for and elect "trader tax status" with a mark-to-market election under Section 475(f) are exempt from wash sale rules entirely — gains and losses are treated as ordinary income/loss rather than capital gains, and positions are treated as sold at year-end for tax purposes regardless of whether they were actually closed. This is a significant, traders-specific tax election with real trade-offs, not something to elect without professional advice.

Part 5. Track Re-Entries So Wash Sales Don't Surprise You at Tax Time

Wash sales are a record-keeping problem as much as a tax one:

1. Log every trade in TRADZY with exact dates, so you can see at a glance whether a loss and a re-entry on the same symbol fall inside the 30-day window.
2. Tag re-entries on a recently-closed losing position specifically, to build a clear picture of your wash-sale exposure across the year.
3. Export your full trade history at tax time to hand to a tax professional rather than reconstructing it from memory or scattered broker statements.

Part 6. Wash Sales Across Multiple Accounts

The rule applies across ALL of your accounts, including a spouse's accounts and IRAs in some interpretations — buying the "same" security in a different account doesn't avoid the rule, a common and costly misconception.

This is general information, not tax advice — confirm your specific situation with a qualified US tax professional, especially if you're considering trader tax status or a mark-to-market election.

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