A client called this morning and stated that the IRS hadn't withdrawn her 1st quarter estimate.

Yes, and refunds are late, too.

I have 2 clients reported the same delay.  As of 4/19/2021, the 4/15/2021 payment has not be taken out yet.

Same here. Client reported payment not taken out yet since 4/8. Can anybody confirm if IRS already took your payment from your bank?  Thank you!