Usage patterns
年度が始まるthe fiscal/school year begins
When the new school year begins, the class assignments change.
年度が終わるthe fiscal/school year ends
The current fiscal year ends in March.
年度内に〈事〉within the (fiscal/school) year
We need to use up the budget within the fiscal year.
〈数〉年度の予算を編成するto draw up the budget for a given fiscal year
There's a meeting next week to draw up the budget for fiscal year 2024.