Private foundations must donate 5 percent of their assets every year. Elon Musk’s enormous charity missed that standard for three consecutive years. Musk Foundation, Musk, Elon, Philanthropy, Tax Credits, Deductions and Exemptions, Internal Revenue Service, United States Politics and Government Private foundations must donate 5 percent of their assets every year. Elon Musk’s enormous charity missed that standard for three consecutive years. NYT > Business