Accounting Periods Generally need IRS approval to change accounting period Business has to establish a substantial business purpose to change accounting period IRS approval is not necessary Conformity between newly married spouses Change to a 52/53 week year ending in the same calendar month as the prior tax year Certain corporation which have not changed accounting periods within 10 yearsAccounting Periods • Generally need IRS approval to change accounting period • Business has to establish a substantial business purpose to change accounting period • IRS approval is not necessary – Conformity between newly married spouses – Change to a 52/53 week year ending in the same calendar month as the prior tax year – Certain corporation which have not changed accounting periods within 10 years