Transactions Report to include Tax Liability
One of the most important thing when importing things into another accounting software such as Quickbooks is the ability to have everything under one report.
The Transactions report you have is missing an important component: Tax Liability. I can see there is a separate report for that, however, it doesn't match up because of the due-date / paid-date discrepancies.
Can you please include in future releases the Total, Subtotal, Tax lines just like it used to be in WHMCS 5 and before it. This is critical, we had to revert back to transactions.php from v5 because v6 lacks the tax report.