For Example :
CSV imported into our system says that the order having a total of 200 or more will be having free shipping.In our system, which is inclusive of tax. Let suppose our total is $200.10 out of which $13.09 is tax and grand total exclusive of tax is $187.01.By default, Magento will consider amount exclusive of tax and charge a delivery fee for this order which is obviously wrong. Advanced Inclusive Tax Table Rates extension corrects this scenario and counts the order of $200.10 to be eligible for free shipping.