Income

Cash sales

If you sell goods or services and the customer pays immediately using cash, payment cards or mobile payment solutions (such as Vipps), it's called a cash sale. 

If you’re involved in cash sales, you must use a cash register with a product declaration to register and document the cash sales.

If you do not use a cash register with product declaration, you may be required to pay a non-compliance penalty.

Read more about your obligation to use a cash register, the receipt requirement, balancing the cash drawer, etc. at Altinn

Invoicing

Credit sales of goods and services are made using invoices.

You must send an invoice to your customer no later than one month after the customer has received goods or services. When you send the invoice, you must post the income in your accounts, even if you've not yet received the payment.

An important requirement is that you cannot set the invoice number yourself. This means there are only two ways of invoicing:

  • by using an computer/based invoicing system, where you cannot set the invoice number yourself
  • by using invoices with printed invoice numbers

The invoice must contain:

  • date of sale and due date for payment of the invoice
  • name and address of both customer and seller
  • organisation number (followed by "VAT" if you're registered in the Value Added Tax Register and the Register for Business Enterprises)
  • a specification of the goods/services you've sold, including time and place of delivery
  • price, specified value added tax (VAT) and total sum including VAT

You're obliged to keep invoices that contain errors or similar that you never send to the customer. Mark them with "Cancelled" or "Deleted", and post them in the correct order of numbers with the copies of other invoices.