"I bought a calendar for next year."
Doesn't accept "来年のカレンダーを買いました" entered via IME. Forces you to use "かいました”.
I suspect that カレンダーの来年 doesn't really mean anything, as it would be something like "the next year of calendar"? But years are not "of (or for) calendars", even calendars can be of / for next year.