1- What is the Meaning of Invoice?
Invoice is a document given from the seller to the customer in exchange for sold goods and services. It shows the amount of debit and regarded as a commercial document.

2- What kind of data should be written in an invoice?
The data that should be written in an invoice are listed below:

Date – Serial Number – Item Number
1. Invoice Date
2. Serial Number
3. Item Number

Seller’s Data
1. Seller’s Name, Trade Name (If any)
2. Seller’s Work Address
3. Seller’s Tax Office and Tax Number

Customer’s Data
1. Customer’s Name, Trade Name
2. Customer’s address
3. Tax Office and Tax Number (If any)

Type – Amount – Price – Sum
1. Type of product or service
2. Amount, (Number, Kg etc.)
3. Price (Unit Price)
4. Sum

3- Should there be a delivery note number in an invoice?
Delivery date of the goods and delivery note number,
1- should be issued by the seller on condition that the goods are delivered or sent by the seller;
2- should be issued and kept in the vehicle by the customer if the goods are delivered or sent by the customer.

4- How should a delivery note be issued if the goods are delivered to other branches except than the main office?
The person who sends the goods should issue a delivery note if the goods are delivered between more than one offices and branches or to another reseller.

5- Should there be stated price and amount in delivery notes?
No.
It is not compulsory to state price and amount in delivery notes stated above.

6- Should there be written where and to whom the goods are delivered?
No.
There should be written where and to whom the goods are delivered.

7- Is delivery note compulsory for retails sold to final customers?
No.
If final customers, who buy the goods as retail with the intent of consumption, send or deliver the goods, it is not compulsory to issue delivery note on condition that they keep the invoices or retail voucher.

8- What is the legal basis of issuing an invoice?
According to article 232 of the Tax Procedure Law, taxpayers stated in this article are supposed to issue or demand and get invoice for sold goods or services.

9- Is it possible to issue a receipt in order to issue a retail voucher? (Retail voucher-Cash voucher)
If the goods or service costs less than 900 TL, it is possible to issue a retail voucher instead of an invoice.

If customer demands an invoice, the seller should demand an invoice whatever the amount is.

Source: Tax Procedure Law