Yes, it does. The difference is that Group Pricing makes changes to the products' prices and the base tax processing does its thing. For Quantity Discounts, the products' prices are left as-is and the deduction (both in product-cost and tax) is calculated after-the-fact.
Are you thinking about something else maybe? The built-in Group Pricing module is an order total module just like the Quantity Discounts order total module. It doesn't change prices. It gives you a single line item discount.
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Are you thinking about something else maybe? The built-in Group Pricing module is an order total module just like the Quantity Discounts order total module. It doesn't change prices. It gives you a single line item discount.
Yep, I was thinking about the built-in quantity discounts' processing.