If you use a tax exemption card, you don't pay taxes. However you still pay labor market contributions (AM-bidrag) which is 8 %.

This means that you will see a small amount is taken from your shifts (as shown in the example below). 
How much is deducted from your pay, you can see in the salary visualiser. Access it via the "Shifts" page. 👉 Click where the turquoise arrow points to.