Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Are wash sale rules different for stocks and ETFs / Mutual Funds?
The IRS rules are actually the same.  26 U.S. Code § 1091 - Loss from wash sales of stock or securities In   the case of any loss claimed to have been sustained from any sale or   other disposition of shares of stock or securities where it appears   that, within a period beginning 30 days before the date of such sale   or disposition and ending 30 days after such date, the taxpayer has   acquired (by purchase or by an exchange on which the entire amount of   gain or loss was recognized by law), or has entered into a contract or   option so to acquire, substantially identical stock or securities,   then no deduction shall be allowed... What you should take away from the quote above is "substantially identical stock or securities." With stocks, one company may happen to have a high correlation, Exxon and Mobil come to mind, before their merger of course. With funds or ETFs, the story is different. The IRS has yet to issue rules regarding what level of overlap or correlation makes two funds or ETFs "substantially identical."  Last month, I wrote an article, Tax Loss Harvesting, which analyses the impact of taking losses each year. I study the 2000's which showed an average loss of 1% per year, a 9% loss for the decade. Tax loss harvesting made the decade slightly positive, i.e. an annual boost of approx 1%.