= 53 weeks/ year. Yes CompUSA had a 53 week year.. Not sure how, but the upper management got some huge bonuses because they hit the base numbers they needed to. Adoption of Tax Year Is consent required? How adopt? What about changing tax year? Generally IRS approval is given only if there is a bona fide business reason for the change, and if income recognition is deferred three months or less. “Adjustments” are required. Tax Accounting Principles What is a method? Why important? Tax Accounting Principles What is a permissible method? Is the taxpayer free to choose?