Taxation regimen requirement range
Taxation regimens vary with the item or service traded. An invoice can include items of different taxation regimens. This applies to GST/VAT, State tax, County tax, City tax, Transit tax, Reverse charge VAT as well as Withholding tax (which is why Manager currently has the option to externally calculate the withholding tax then add an invoice specific fixed dollar amount).
Having one Manager tax code per taxation regimen (independent of aggregation) supports efficiency of accounting analysis (localisation, reports).
There are several different ways taxation regimens could be applied to accounting records while maintaining compatibility with the range of taxation regimens used world wide.