The billing tab is accessed from the SETTINGS page on the Taxfiler menu.
This page contains a list of all the invoices raised for your subscription, and whether they are paid or outstanding.
Note that if you pay by direct debit it may take a couple of days after the funds leave your account before they are marked as paid on an invoice.
Viewing your VAT invoices
You can view or download a VAT invoice by clicking on its description.