Thanks!

#1: Absolutely. I have clients in that exact situation and I'm telling them they can choose to wait until October to pay their IRS balances due and estimates. 

Note it also applies to payroll tax RETURNS but not the payments.

#2: IR-2023-33, as you mentioned, is the source. 

IR-2023-33, Feb. 24, 2023

WASHINGTON — Disaster-area taxpayers in most of California and parts of Alabama and Georgia now have until Oct. 16, 2023, to file various federal individual and business tax returns and make tax payments, the Internal Revenue Service announced today. Previously, the deadline had been postponed to May 15 for these areas.

The IRS is offering relief to any area designated by the Federal Emergency Management Agency (FEMA) in these three states. There are four different eligible FEMA declarations, and the start dates and other details vary for each of these disasters. The current list of eligible localities and other details for each disaster are always available on the Tax Relief in Disaster Situations page on IRS.gov.

The additional relief postpones until Oct. 16, various tax filing and payment deadlines, including those for most calendar-year 2022 individual and business returns. This includes: Individual income tax returns, originally due on April 18; Various business returns, normally due on March 15 and April 18; and returns of tax-exempt organizations, normally due on May 15.

Among other things, this means that eligible taxpayers will also have until Oct. 16 to make 2022 contributions to their IRAs and health savings accounts.

In addition, farmers who choose to forgo making estimated tax payments and normally file their returns by March 1 will now have until Oct. 16, 2023, to file their 2022 return and pay any tax due.

The Oct. 16 deadline also applies to the estimated tax payment for the fourth quarter of 2022, originally due on Jan. 17, 2023. This means that taxpayers can skip making this payment and instead include it with the 2022 return they file, on or before Oct. 16.

The Oct. 16 deadline also applies to 2023 estimated tax payments, normally due on April 18, June 15 and Sept. 15. It also applies to the quarterly payroll and excise tax returns normally due on Jan. 31, April 30 and July 31.