Your bonus stops being calculated a year from the day you were approved and then they give it to you 30 days later. Any spending in October would be 5% not 10%.
For future reference- if you got an It Card halfway through a quarter could you get 5 quarters worth of Cashback Match?
Imin a similar situation. My year ends October 23. About a week before, whatever spend I have left , i will buy amazon credit on the site.