Time limit for issuing invoices
Based on current rules, invoices must be issued within seven days of the date of delivery of the goods/rendering of the service. According to the new rules, suppliers are obliged to issue invoices until the 15th calendar day of the month following the supply. Certain exceptions to this rule allow for a deadline of thirty, sixty or even ninety days for issuing an invoice.  It will also be possible to issue invoices prior the supply of goods/services; nevertheless, not more than thirty days in advance.

Determining the tax base
Under the current rules the taxable amount corresponds to the net turnover. Under the new rules the taxable amount will be defined as being the consideration, namely, everything that the supplier of goods/services obtains or is deemed to obtain. Subsidies, along with other means of payment directly linked to the price of goods/services will also be included in the tax base.