The shape of December 2026 is set by a single date and everything arranged around it: last posting dates in the second week, the office party, the quiet week between Christmas and New Year when very little of the country is properly at work, and New Year's Eve at the far end.
December closes the fourth calendar quarter and the calendar year itself on the 31st, resetting annual and quarterly reporting cycles at a stroke. The tax year runs on regardless, three months short of its own end, which is why December and April both feel like year ends to anyone doing the books.
December 2026 runs to 31 days and closes a year of 365 days on the 31st. The tax year that began the previous April carries straight on into January untouched, and does not reset until the 6th of the following April.
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