The IRS had previously released Notice 2020-18 extending the due date of returns and payments due April 15, 2020. Any person or entity (corporations, partnerships, LLCs, etc.) that has a return due April 15, 2020 or a tax payment due on that date has an automatic extension for both filing returns and paying those payments until July 15, 2020. Extensions are not required.
IRS Notice 2020-23 has changed the due date for SECOND quarter estimated tax payments from June 15, 2020 to July 15, 2020. In summary, Notice 2020-23 extends the due date for filing all income, estate and gift tax returns, and the due date of any required tax payments with those forms, due between April 10, 2020 and July 15, 2020 to July 15, 2020.
If additional time is required for filing returns that are now due July 15, 2020, an extension of time must be filed by the July 15 deadline. The extensions do NOT go beyond the normal extension dates. I.e., if an individual taxpayer files and extension, Form 4868, on or before July 15, 2020 the extended due date will be October 15, 2020. Extensions filed on July 15 DO NOT extend the time for paying the taxes.
Many states have adopted conforming language to extend the state due dates and payment dates to July 15. Click this link to view a summary of those states.