Tune your prices so everything rings up in whole dollars — tax included. Your register stops needing coins, and it costs you nothing at the till because no discount is ever applied. Works with any POS that can export and import its price list.
Export it from your POS first — Square: Items → Actions → Export library. Shopify: Products → Export. Clover: Inventory → Export. Or just paste names and prices.
— or paste a list (name, price per line) —
— or type items one at a time —
Set your tax rate, then untick anything you'd rather leave alone. Nothing changes until you download.
Keep the original. If anything looks wrong after importing, import the original and you're exactly back where you started.