The way we calculate taxes in Brandibble is by applying it to each menu item and each modifier separately. Each tax gets rounded up so if you try to calculate tax on an order total, it's never going to be exactly the same as the sales tax. This is the correct way to apply sales tax.
For example, this is how an 8.875% tax rate would be calculated and applied to this order:
If you applied the tax rate to the order total, you'd get $2.01.
If there are individual taxes or overrides on certain items and modifiers, the same rules apply: the tax will be applied to each item individually, rounded up to two decimal places, and then added to the total.
All POS systems calculate taxes in their own unique way and typically allow for a small margin of difference (usually up to 10¢ per order). If you see any egregious discrepancies, please reach out to our support team so we can take a look!