What do I pay when I sign up for a monthly subscription?

When you start a subscription for the first time you pay a starting fee of 249 SEK + the monthly fee from the start date. How much you pay for the monthly fee depends on what day of the month you choose to sign up.
 
If you start your subscription the 15th or earlier, you only pay for the remaining days of the month. If you start it after the 15th, you pay for the remaining days of the month + the upcoming monthly fee. This is because the automatic payment needs to have enough time to be activated.