noun
Refers to the period around the end of the previous calendar year, often used in business or personal contexts to talk about events, deadlines, or situations that occurred at that time.
去年末に引っ越しました。
I moved at the end of last year.
去年末の決算は厳しかった。
The financial results at the end of last year were tough.
昨年末 is a more formal synonym for 'end of last year', often used in written or business Japanese.
Compound of 去年 (kyonen, 'last year') and 末 (matsu, 'end'). The reading is a straightforward combination of the two components.