They really should use WebPay to be sure it is paid in time. 

https://www.ftb.ca.gov/forms/2025/2025-3893.pdf if they REALLY WANT TO MAIL SOMETHING.

They will make the payment online and I still send them a voucher, which has the information they need to enter online.  Lacerte should have this 2nd payment voucher, CCH does, it's a big miss.  Filling out a manual voucher for each client isn't going to happen.  

Hi @sfmeliss Nice to see you in the community and thanks for posting about Form 3893. We recommend reaching out to Lacerte Support. They might be able to provide further guidance on entering information for this form.