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On the Settings window, Tax tab in kBilling® there are 3 different options for rounding. These options affect both prices and taxes.
These options are taken into account when the end total of a calculation is outside the number of decimals normally used with currency.
For example, an invoice line item with a quantity of 3.55 and a perunit price of $56.33 is exactly $199.9715  however, no one could pay that amount.
With the "always round up" option $199.9715 becomes $199.98
With the "always round down" option $199.9715 becomes $199.97
With the "always round nearest" option $199.9715 becomes $199.97 as well. However, if it had been $199.975, it would have rounded up. The "nearest" option uses basic arithmetic rounding where >= 5 is rounded up, <= 4 is rounded down.
Tax calculations can also result in an exact number that is outside the realm of "real" currency values so these options also affect rounding with regard to tax.
Note that the US dollar symbol was used in these examples but these features are in no way tied to currency.