Declarations of estimated tax; short taxable year; declaration requirement

A separate declaration must be filed where a return is required for a period of less than 12 months, unless the short period is less than four months or the requirements to file are first met after the first day of the last month in the short taxable year. In the case of a decedent, no declaration need be filed after the date of death. The decedent's estate, however, may be liable to file a declaration of estimated tax.

For the purpose of determining whether a declaration must be filed for a short taxable period which results from a change in annual accounting period, the tax for the short period shall be placed on an annual basis by multiplying the amount thereof by 12 and dividing the result by the number of months in the short period.