From the IRS website:
The IRS has established a special section focused on steps to help taxpayers, businesses and others affected by the coronavirus. This page will be updated as new information is available. For other information about the COVID-19 virus, people should visit the Centers for Disease Control and Prevention (CDC) (https://www.coronavirus.gov) for health information. Other information about actions being taken by the U.S. government is available at https://www.usa.gov/coronavirus and in Spanish at https://gobierno.usa.gov/coronavirus. The Department of Treasury also has information available at Coronavirus: Resources, Updates, and What You Should Know.