I assume that you are creating a pro-forma for others to use. Very simply, you could offer a cell that asks the user to nominate the applicable tax rate for their tax jurisdiction, or, if you know (or assume the value), place that into a cell then multiply the taxable amount by 1+the tax rate, ie I buy shoes for $4 and have a 10% tax rate. Multiply the price of the shoe by 1.04 and you have the final price, inclusive of taxes.
Usually all fees and charges are applied before the taxes are calculated., but check your local tax rules because some government levied charges may not be taxable.
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