Configure WHMCS to automatically store client data (the client's name, address, and tax ID) at the time of invoice generation.
Troubleshoot and resolve unexpected client details on an invoice.
Troubleshoot and resolve unexpected changes to a service's Next Due Date value.
Change the sales tax rates on future generated invoices. You may need to do this if your local government changes your sales tax rates.
You can easily change the logo in emails, on generated invoices, and in the Client Area.