30 Day Window

The 30 day window refers to the period before and after a sale during which the purchase of a substantially identical asset will trigger the wash sale rule. Specifically, if an investor buys a substantially identical asset within 30 days before or after the date of a loss sale, the loss is disallowed.

This creates a 61 day total period, including the day of the sale, where re-entry is restricted for tax purposes. Traders must track this window carefully to ensure they do not inadvertently lose the benefit of their tax loss harvesting strategies.

It is a critical timeframe for managing capital gains in taxable accounts.