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Fiscal year

The twelve-month accounting period a company files on; the calendar year for almost every small company and every individual-owned single-member LLC.

The short answer, then the detailChecked September 2026

The detail

What it means in practice.

A corporation can choose a year end other than December, and its return is then due on the 15th day of the fourth month after it. A foreign-owned single-member LLC uses its owner's US tax year or, if the owner has none, the calendar year. The compliance calendar assumes the calendar year unless the company chose otherwise.

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