Hypothetically, a taxpayer sells 100 shares of an ETF, harvesting a long-term capital loss. Three weeks later, they receive 2.471 shares of the same ETF through the brokerage's automatic dividend reinvestment program.
Does that count as a wash sale in the same way as an intentional purchase would? And if it does count as a wash sale, does the investor lose all the tax benefit of the loss on the 100 shares, or only 2.471% of it to match the shares "purchased"?