Hello Adriano,

To remove Unutilized tax amount , you need to do the changes in upgrade app template.
Go to Root/plugins/payplans/upgrade/upgrade/tmpl/upgrade_from.php, near line no. 64, find below mentioned code

<tr>

							<td><?php echo XiText::_('COM_PAYPLANS_UPGRADES_DETAILS_NOT_UTILIZED_TAX');?></td>

							<td class="payplans-upgrade-unutilized-tax"><?php echo $this->_render('partial_amount', compact('currency', 'amount'), 'default'); ?></td>

						</tr>

Remove above mentioned code.

Update me if you still have any issue.

Great! That was exactly it. Thank you, my dear =)

Your most welcome. Glad to hear that your issue has been resolved now.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.