If you are expecting a refund, get your tax returns filed as soon as you are able so that you are not delaying the receipt of your tax refund.
If you owe taxes for the 2019 tax year, the payments are now not due until July 15th. Hold off on making these payments until much closer to the due date as there are no interest or penalties assessed so long as the tax is paid by July 15th.
If you or your business are impacted by the Coronavirus and/or the shut down, be aware of government sponsored programs that are available to assist you. There are programs to assist with student loans, unemployment benefits as well as federal loans for small businesses, etc.
US Internal Revenue Service https://www.irs.gov/coronavirus
CA Tax Franchise Board https://www.ftb.ca.gov/