If I have any clients who want to do this, I'm going to make sure THEY keep track of the fact money will need to be sent 12/2021 & 12/2022.   I gave up babysitting as one of my professional services last year 🤣

They are free to contact me later in the year, once the IRS/Intuit comes up with the proper way to send the payment - but THEY have to be proactive about it.