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by projektfu 1382 days ago
In the US, discounts applied to taxable items reduce the sales tax. If you're given a credit instead, it's applied after the sales tax. If a store gives you $5 non-refundable credit, they end up paying some sales tax for you. If they give you a $5 coupon, then the whole amount can be applied to a subtotal before tax.

However, the coupon has no accounting value beyond its $0.0001 face value.

I'm sure there are even more oddities and complications a tax accountant can mention that I'm not even aware of.