At January 31, the End of the First Month of the Year

Essay

At January 31, the end of the first month of the year, the usual adjusting entry transferring expired insurance to an expense account was omitted. Which items will be incorrectly stated because of the error on (a) the income statement for January and (b) the balance sheet as of January 31? Also indicate whether the items in error will be overstated or understated.