>I don't think that is possible - due to rounding scenarios
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>Take this for example
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>Provincial tax on $1.74 is round(1.74 * .095, 2) or $0.17
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>What amount is the base of $0.17 tax ?
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>round($.017 / .095,2) = $1.79 (see how this compares to the original $1.74)
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>iow, you need the Total including all taxes, and knowing the two percentages and the order in which they were applied, you work your way back
This is what I think too but I will take a look at the other message you provided.