Sales Invoice Process
Based on the regulations of Act CXXVII of 2007 on Value Added Tax related to issuing of an
      invoice, a sales invoice must include this data:
    - Invoice Date - The date on which the invoice is issued
 - Delivery Date – The date on which the goods are delivered. If the invoice issue date is different from the delivery date, this date is used to identifying the tax period.
 - Document Number – The unique alphanumeric code used to generate document number
 - Buyer Data: The name, address, and tax number of buyer
 - Vendor Data: The name, address, and tax number of the vendor
 - Description of the goods sold or services performed
 - Quantity of the goods sold or services performed
 - Net Unit Price - The unit price of the goods or services (without the tax amount)
 - Net Sales Value - The sale value of the goods or the services performed, without the tax amount
 - Tax Rate and Amount – The total amount on which the tax is calculated and the rate on which the tax is calculated
 
 A sales invoice can also include this optional data:
    - Harmonized System Code – If items belongs to the Reverse Charge taxation category, it is recommended to use this information on invoices
 - Payment Method
 - Due Date
 
In special scenarios, these fields are mandatory to be included on sales invoice:
  - Buyer EU tax number – In case of sale within community without VAT
 - Customer EU tax number – In case of member of EU community
 - Exchange rate and VAT amount in local currency - In case of non local currency,
 - The words “fordított adózás” (“reverse charge procedure”) – In case the customer is liable for payment of VAT
 - The words “önszámlázás” (“self-billing”) - In case the customer receiving a supply of goods or services is issuing the invoice;