Businesses already do rounding on sales tax, since percentage tax will often be fractional cents. And they do round down if it is below half a cent. I don't se

Businesses already do rounding on sales tax, since percentage tax will often be fractional cents. And they do round down if it is below half a cent. I don't see why this would be different. Most likely there would be a law that covers it. (I believe there already is regarding sales tax)