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Tax Invoice 
A document that shows a value-added tax item and which is recognized by the tax authorities as evidence that a VAT transaction occurred. Tax invoices are thus used to substantiate tax returns.
The law requires you to create a tax invoice within seven days of a sale, and to show all the information listed under “Structure” below.
When you have created a billing document, you can print out a tax invoice using the Output function. You must print out two copies of each tax invoice: The original is marked with the word Oryginał, and the copy with the word Kopia.
If you need to correct a tax invoice, create a Correction Tax Invoice.
The tax invoice header contains the following information:
· Names, addresses, and NIP numbers of the buyer and seller
· Sale date
· Tax invoice issue date and number
· Words “VAT invoice” (in Polish, Faktura VAT)
It must show the following information for each item:
· Name of the goods or service
· PKWiU (for tax-exempt and reduced-rate items only)
· Unit of measure, net price per unit, and net price per item
· VAT rate and VAT amount
The tax invoice must also show the following:
· Subtotals of all items taxed at the same rate, showing the net amount, VAT, and gross amount
Note that the subtotals of tax-exempt items are marked zw.
· Total amount receivable (including VAT), in numbers and in words
· Signature of a person authorized to issue the tax invoice
