Final answer:
Changing the required balance of the allowance for uncollectible accounts from $180,000 to $135,000 increases the income before taxes by $45,000 since a smaller expense will be recognized in the income statement.
Step-by-step explanation:
The effect on income before taxes of the change requested by the controller would be an increase. Initially, the allowance for uncollectible accounts needed to be set at $180,000 based on your aging analysis. However, after the controller's adjustment, which is not aligned with actual aging information, this allowance is reduced to $135,000.
The difference between the two allowances is $45,000. Because the allowance for uncollectible accounts is a contra-asset account that decreases the total accounts receivable on the balance sheet, lowering the allowance increases the net value of accounts receivable, which subsequently increases income before taxes.
Thus, with a $20,000 credit balance already present in the allowance account, the initial required adjustment would have been an increase of $160,000 to reach the necessary $180,000 balance ($180,000 needed - $20,000 existing).
After the controller's adjustments, only an additional $115,000 ($135,000 needed - $20,000 existing) is required, resulting in a $45,000 less expense recognized in the income statement, which in turn boosts the income before taxes by the same amount.