We have been using Anybill to process all payments related to sales and use tax on a monthly and quarterly basis. It simplifies payments so that you don't need to log in to each state to remit payments. Review collected by and hosted on G2.com.

When you transfer funds before authorizing payments, it is not super clear where those funds are sitting, and you have to dig around the portal to find them. Review collected by and hosted on G2.com.