The IRS has announced that it will resume issuing the 500 series balance due notices to taxpayers later in October. While these notices were paused on May 9 due to COVID-19, the agency did not officially confirm this pause until August 21, 2020. 

"Although the IRS continued to issue most agency notices, the 500 series were suspended temporarily because of a backlog of mail at the IRS due to COVID-19. The mail backlog is now caught up enough to account for the timely mailed payments. Some taxpayers will begin seeing in late October or early November, the updated 500 series notices with current issuance and payment dates," the IRS said.

The 500 series includes the CP501, the CP503 and the CP504 notices.

The full IRS announcement is available to read here.