When you reach a new commission tier, the new percentage will be applied two months later.
For example, if you secured 100 bookings in January, all bookings created in March would receive the 30% commission (paid two months after the guest checks out).
Commission is always paid based on the commission tier you were in at the time of booking. This means that sometimes, bookings stayed in the same month will be paid at different commission rates.
In this image, the affiliate partner was paid in March 2015 for reservations that checked out two months previously, in January 2015.
It shows two commission amounts: 30% and 35%. In this case, 12 bookings were made when the commission percentage was 30%. The remaining 99 bookings were made when the partner was on a 35% commission percentage.