Hi @nathan882
There isn’t a facility to pay monthly at the moment I’m afraid, although this is something that’s planned:
http://community.quickfile.co.uk/t/important-changes-affecting-large-and-extra-large-accounts/8260/86
To help answer your question with your account being classified as Large, there is a report that will break everything down for you. Take a look at this post for info:
http://community.quickfile.co.uk/t/important-changes-affecting-large-and-extra-large-accounts/8260/122?u=qfsupport