Nope it shouldn't affect sales taxes at all: we'll just add the rounding line to all cash transactions, the same way the do in Australia.
Cash register receipts down-under total up the prices, add general sales tax, then have a line which is either blank, or says 'rounding -0.02', 'rounding -0.01', 'rounding 0.01' or 'rounding 0.02', depending on the deviation from the nearest amount divisible by 5 cents Australian.
It's like having one of those 'take a penny, leave a penny' bins, with everyone required to participate.
I've been advocating it for years, and have taken to calling the little bins or cups 'Currency Reform Bins'.
I think the more pennies we see on the ground, it's a sign that they'll stop producing them.
Yes. There is no one centime/rappen coin in Switzerland. The 5 is the smallest and prices are determined accordingly. Any % off sale just rounds it to 5. Big Whoop.
What we need are some dollar coins that are common and circulated.
The military has been doing the same thing at commissaries and exchanges overseas for years. It cost too much to ship the pennies over so they have been rounding up and down; doesn't seem to have caused much of a problem.