Lesson 6 of 15

A legally valid invoice in Estonia

Last updated 2026-10-312 min read

A sales invoice is a document that you give your customer to show what they bought and what they owe. In Estonia it must contain certain details, and a VAT-registered company must show VAT on it. This lesson lists the parts that Sapita fills in for you, and what you have to check.

What the invoice must show

  • A number and a date. The number runs in order with no gaps, so use the prefix and sequence that Sapita sets.
  • Your name, address, registry code and VAT number, if you have one.
  • The customer's name and address, and their registry code or VAT number where the sale needs it.
  • A description of each item or service, the quantity and the price.
  • The VAT rate and the VAT amount for each line, and the total with and without VAT.
  • The payment details: the bank account and the due date.

Numbering

Numbers must follow each other. Once the first invoice exists, Sapita locks the numbering prefix and the starting number. A mistake is corrected with a credit note, which is a new document that cancels the old one. Read the credit note lesson in the glossary for the details.

The due date

The due date is the day the customer must pay. Sapita counts it from the invoice date and the payment terms you choose, for example 14 or 30 days. The due date appears on the invoice and in the list of receivables.

Your check before sending

  • Is the customer's name and registry code correct?
  • Is the VAT rate right for what you sold?
  • Does the total match the lines?

Sapita checks the arithmetic and the required fields, but it cannot know the terms of your contract. Those remain your responsibility.