Recognizing the entire 2 year premium as expense is an error.
A correction of error is accounted for by?
Retroactively restating prior period financial statements
A change in accounting estimate is reported?
Prospectively ( in the period of the change and for future periods if the change affects both)
What is the appropriate reporting treatment for a change in accounting estimate ?
In the period of Change and future periods if the chance affects both
How should a company report its decision to change from a cash basis of accounting to accrual basis of accounting?
As a prior period adjustment net of tax, by adjusting the beginning balance of retained earnings