If you have transactions that can't be imported into Taxdoo using our standard supported interfaces, you can upload data from other systems (e.g. Navision) in the form of a CSV file.
Please note that in ongoing operation CSV transactions must be uploaded by no later than the 3rd of the following month, at 23:59.
Also note that we don't recommend CSV uploads. This is because the use of the Taxdoo API is easier and faster for you, especially in the case of many transactions. You can find in-depth documentation about this here: https://dev.taxdoo.com/#introduction.