The article mentions several practical and legal issues, and your comment does not address any of them.

Also, "whatever they do" currently is rounding to two decimal places - that doesn't help us here. I'm not saying the software changes required are challenging, but I'm sure there are lots of POS systems that are not properly maintained anymore that will cause issues for a lot of smaller merchants.

My comment is meant to be high level.

If you want a specific solution:

1. use a POS that supports rounding to the nearest 5 cents

2. ignore laws written assuming the penny is in production. they obviously need to be updated. judges are not idiots.

Ah - the "trust me bro" defense. How does that protect you from the legal costs of malicious prosecution? Even if you win it will cost you.

No it's the "penny is no longer in production" defense.

Look, if you own a business do whatever you want.

The problem is that the rounding you are asking them to do is illegal in a few states.