Overview:
The VAT factor change will take effect on 01 April 2018.
1. Steps to update the Vat factor:
Log into TNG - General Settings - Company Details and in "VAT Factor e.g. 1.14 for 14%" change the current value to 1.15 and click on "Apply Changes".
Once complete, click on "Synchronize Data" and select the date - 01 April 2018.
2. To re-cost call data from 01 April 2018, please refer to post below:
How do I recost calls in TNG?