Ann: Investor Presentation, page-155

I must admit I have seen both but more often it is not (in my experience) taken into account. Not sure if SEA Ryder Scott one does or not.

If it does it typically overstates the amount of corporate taxes to be paid as the FASB requirements require it to be taken into account for "the entity's proved oil and gas reserves" and does not take into account past tax losses or other non-reserve deductions like amortization of goodwill.