Absolutely. When the number of members in your Group goes beyond your subscription’s base allowance, you’re charged prorated amounts for the time your additional member block is active. For example, say your Group has a Premium plan, and there are 100 members at the beginning of the month. That’s covered by the base price of $300/month. If you add another member halfway through the month, that change would require an additional block of members for your group. In the Premium plan, each additional block of members is $50/month, so adding an additional block would bring your subscription to $350/month. However, for that month that you made the change, you would be billed a total of $325, as follows: $300 for the base block members +$25 prorated charge for the additional block of members for the second half the month As a group administrator, you can always see your estimated upcoming charges in your group's settings, including any applicable proration details.