How to enable posting sales tax when posting sales packing slip in AX 2012

    1. In the “Inventory management parameters” form, we need to check “Post physical sales tax”
2.     In the “Item model group” form, we need to check “Post to Deferred Revenue Account on Sales Delivery”. Because the deferred sales tax is calculated based on the deferred revenue.
3. Set up the posting accounts related to deferred revenue and tax in posting form.
4. After finishing the settings above, we can post the packing slip with sales tax voucher. See below as an example.