Quesiton
Is the value entered in Sell(inc) column always taken as including tax irrespective of what is selected in Tax column?
Column header says (Inc) but as per the calculations which are in place, the value in Tax column does matter for the value in Sell (Inc) column.
Answer
If the 'tax %' field is populated with a value this will define what appears in the sell (inc) field. The 'Tax' field has no bearing on the calculation.