I am a partner and there is no special situation I am aware of for non profits.
“Annual renewal” is not quite accurate. Licenses can be purchased for any range from one day to 10 years and usually coterminate on the same day.
Just get access to their dashboard and look at the license screen to see where they are at. Then you can budget for when they need to renew.
- Ex community all-star (⌐⊙_⊙)