When you pay for a year in advance you get 2 months free. So we charge you upfront for 10 months only.
Example: you're going with the yearly 99 plan. You'll be charged $990 (10 times $99) for the entire year. The yearly plans have the same monthly ad spend limits as the monthly plans. So the yearly $99 plan would have $10k spend limit per month.
You can upgrade or downgrade being on an annual plan almost the same as on a monthly plan. The cost will be prorated but given that all payments take place at the beginning of a new billing cycle you will be charged only when the next year starts.
As always, if there is anything you'd like ask us we're always there in the in-app chat. Or you can email us at email@example.com.