Tax Timing

Could someone provide insight into configuring Epicor to credit tax accounts during revenue recognition (at the point of shipment)?

Specifically, the customer is pre-paying, and I am trying to recognize revenue and tax at the point of shipment. I am using an AR advance billing invoice to credit deferred revenue. The system knows to convert the deferred revenue into revenue for the shipment invoice.

The problem comes when tax is involved; the AR tax appears to immediately get credited during advance billing. By switching the tax timing from invoice to fully paid, the system uses an interim tax until payment, but this payment is still received prior to actual shipment in my case. Is there an alternative way to configure this such that the interim tax is converted to AR tax only during the final shipment invoice as with revenue recognition?