Definition: the year end is the closing adjustment period of a company's accounting year.
At the year end, a company must go through the process of adjusting each entry to an account in order to properly state these entries for financial statement preparation purposes.
There are many kinds of required adjustments. These can include the accrual or deferral of
revenue or
expense items, reclassification, adjustments to conform book figures to physical counts (stock), and reflecting on any unusual transactions.

The year end when you complete the closing adjustment period of your company's accounting year
Accounting year end
No matter what twelve month period a company's
accounting year covers, the initial accounting year end date will be on the first anniversary of the end of the month in which it was incorporated.