When To Make the S Corporation Election

Complete and file S Corporation Federal election form Form 2553, no more than two months and 15 days after the beginning of the tax year the election is to take effect, or
At any time during the tax year preceding the tax year it is to take effect.
Most states require a state election form in addition to the federal election form to be filed.
For this purpose, the 2 month period begins on the day of the month the tax year begins and ends with the close of the day before the numerically corresponding day of the second calendar month following that month. If there is no corresponding day, use the close of the last day of the calendar month.