Accounting SIE export
SIE is a file format for importing vouchers into an accounting system, mostly used in Sweden.
Cardboard’s SIE export allows you to import the payments done via Cardboard to most Swedish accounting systems without setting up an accounting system integration.
This tutorial assumes that you have already configured Cardboard for accounting as described in Accounting settings.
Exporting
Your monthly payments can be exported from Cardboard to a SIE file by following these steps:
- Navigate to Accounting > Export.
- Select the month you want to export.
- Click SIE with 45xx. To leave out the 45xx and 4599 lines, first open the menu next to the button and choose SIE without 45xx. See The taxable amount for which variant to use.
Importing
How to import the SIE file varies from accounting system to accounting system. Please refer to your accounting system's documentation if you don't find any specific instructions below.
Importing to Fortnox
Cardboard’s SIE export allows you to upload all the payments and receipts collected by Cardboard directly to Fortnox.
In Fortnox, open the menu hidden behind the name of your company in the top-right corner and select "Import".

Drag-and-drop the .si file downloaded from Cardboard into the section labeled as "Dra och släpp en SIE-fil här eller klicka på Läs in fil uppe till höger." or press the "Läs in fil" button in the top-right corner.
By default, Cardboard exports the purchases against account "1935 - Cardboard SEK konto". This can be changed in the accounting settings of Cardboard or changed during import into Fortnox.

Under the section "Transaktioner" it could make sense to select "Koppla" under "Åtgärd" (1 below) and enter "E" into the "Verserie" field (2 below) in order to connect the payments to "Utbetalningar till leverantörer" (3 below).

Press "Importera" in order to import the transactions into Fortnox.
Using merged receipts
If Receipt delivery is set to One PDF per receipt, payments will appear like this in Fortnox:

Adding collected receipts exported from Cardboard as vouchers will require you to press into each item and upload the matching receipt. If you want to save time, set Receipt delivery to One merged PDF in Cardboard's accounting settings and export the SIE file again. All transactions will then be grouped into a single item in Fortnox like this:

All purchases are grouped into a single item, to which you can attach the merged receipt. Download it from the receipt button next to the SIE button. If the button shows Receipt archive, choose Merged receipt in its menu.
"Kostnadsställe" and "projekt"
The KS and PR, kostnadsställe and project respectively, can be populated with correct values by entering values for "Department code" and "Project code" in Cardboard's accounting settings.