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Can the Wash Sale Rule Be Triggered by Trading Different Strike Prices of the Same Option?

Yes, it can be triggered. While options with different strike prices are generally not "substantially identical," if the difference in strike price is minor, or if the option is deep in-the-money, the IRS could argue they are substantially identical.

The determination is based on facts and circumstances, but to be safe, traders should assume options with similar terms may trigger the rule.

What Is the Wash Sale Rule and How Does It Apply to Options Trading?
What Constitutes “Substantially Identical” in the Context of Options and the Wash Sale Rule?
Does Holding a Futures Contract and a Substantially Offsetting Position Trigger a Constructive Sale?
Under What Circumstances Would It Be Optimal to Exercise an American Option Early?