Originally Posted by
swguy
I assume you're using Free Shipping for over $100 by configuring Admin > Modules > Order Total > Shipping (free shipping over).
If so, that module is coded using this check:
if ($pass && ($order->info['total'] - $order->info['shipping_cost']) >= MODULE_ORDER_TOTAL_SHIPPING_FREE_SHIPPING_OVER) {
You could change it to use the subtotal instead of the total, or subtract the tax out, as you see fit.
The relevant variables are $order->info['subtotal'] and $order->info['tax'].
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