The Eaton Vance Tax-Managed Buy-Write Income Fund operates as a closed-end equity investment vehicle, which was established and is overseen by Eaton Vance Management, with Parametric Portfolio Associates LLC sharing co-management duties. The fund's primary objective is to allocate capital to publicly traded stocks within the United States, specifically targeting large-capitalization companies across a diverse array of sectors. A distinctive aspect of its investment strategy involves selling call options on one or more U.S. market indices, covering a significant portion of its underlying common stock holdings. The fund's performance is benchmarked against the S&P 500 Index. It was founded on April 29, 2005, and is legally based in the United States.