This module address 2 main tax requirement in Thailand

1. Tax Invoice (VAT)
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Point of tax invoice can occur either on Invoice (VAT) or on Payment
(Undue VAT on invoice become VAT on payment)

2. Withholding Tax
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This is the tax that is deducted during payment. There are 2 kinds of withholding tax calculataion.

#. Fixed rate of based amount, i.e., service 3%
#. Progressive rate of accumulated amount, i.e., personal income tax
