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- PKW ( PJR )Lv 71 decade agoFavorite Answer
If there is a sales tax or VAT , the tax authority will issue approved form of tax invoices to a trader selling goods. A portion of money on the price will be added as a sales tax or VAT. These tax will be accounted for and remitted to the tax authority. So, this is also served as a tax collection document. e.g. In Mainland, a special VAT invoice should be used.
Invoice is just an ordinary invoice issued to your customers. It normally used where there is no sales tax or VAT.