In the case of a monthly contract, we will charge a one-time, pro-rata amount to the credit card to cover the cost of the account for the new user for the remainder of the current billing period. For example, suppose your team uses the standard plan, which costs 20 EUR per user per month. You add a new team member 10 days after the start of your current billing cycle, and there are 20 days left in the month. The cost per user per day is 20 / 30 EUR, so we will charge your team's credit card with 13.33 EUR (20 / 30 days x 20 days) once. With an annual contract, we will apply new prices for all users from the moment you move to a new schedule because you get a new volume discount. Example: You have 40 users and add another 10 users after half a year. You pay 6912€ (40 users x 12 months x 14,40€) at the beginning of the year. You pay 624€ after half a year, where you would have to pay 816€ for 10 users (10 x 6 months x 13,60€) but you get 192€ credited (40 users x 6 months x 0,8€) because they were overpaid by the initial contract. We call that fair.