If you already own a seat and purchase an additional seat during the contract period of that seat, you will be billed on a pro-rated basis from the day you purchase the additional seat to the next contract renewal date.
In the case of additional seat purchases on a monthly basis
The additional seat will be charged on a pro-rated basis until the next monthly contract renewal date.
The formula for calculating the daily fee is as follows
Total daily fee = ( Monthly fee / Number of days in the month ) x Number of days remaining including the day of the month
Adding a seat to the annual fee
For annual plans, the fee for added seats is prorated by the number of days remaining until your next renewal date and charged in full when you add them. Please check the exact amount shown on the seat addition screen.
For annual plans, the amount is the annual price of one seat prorated by the number of days from the date it is added to the next renewal date. If you had removed the usage-based charges for meeting analysis and SMS, usage that has not yet been billed is also included in this charge (it is not a separate charge).