Brock J. answered 25d
First you would check the balance as of 12/31/2015. After a review of Accounts receivable it is determined the uncollectible accounts have increased by $45,000 during CY2016. The adjusting journal entry would be as follows:
Dr Bad Debt Expense $45,0000
Cr Allowance for bad debt $45,0000
Oh the balance sheet the allowance for bad debt account is a contra account to Accounts receivable. The Allowance account reduces the carrying value of Accounts Receivable by the current balance in the account.