end of the fiscal year; end of the school year
Refers to the end of a fiscal or academic year, typically March in Japan. Context determines whether it means fiscal or school year.
年度末は仕事が忙しい。
The end of the fiscal year is busy at work.
学校の年度末には成績表が配られる。
Report cards are handed out at the end of the school year.
年末 means the end of the calendar year (December), while 年度末 means the end of a fiscal or school year, which in Japan is usually March.
Compound of 年度 (fiscal/academic year) and 末 (end).