Anyone who conducts business through a sole proprietorship can basically choose between two different accounting methods.
One is the billing method, which is the most common method and is called frequently for the main method. Billing method is somewhat more difficult than the second method, kontantmetoden.
Billing method simply means that you report VAT in the accounting period in which the invoice according to generally accepted accounting principles have been recognized or should have been recorded. VAT according to lists of unpaid bills at the end of the period, be recognized in the period.