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Sales Tax error

John der Kinderen

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In version 6.1.12 I'm seeing an error in sales tax calculation.  It happens ONLY when I apply a promo code.  In other words, sales tax is correct in a normal cart.  There is no obvious mathematical relationship (that I can see) between the correct amount and the calculated amount when the promo code is applied.  The promo code itself calculates discount correctly.

I've also noticed that the incorrect amount CHANGES when I change shipping method.  It changes be an amount that seems not to be related to anything obvious.

I have a very simple sales tax calculation of 5.5% applied only to addresses in my state.  The promo code is a 20% discount on product (not shipping).

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