I am needing clarification with this. I know that you estimate what to put in allowance for doubtful accounts (the contra asset account) at the first of the period and that you adjust it as the accounting period goes along (writing off accounts, adjusting accounts receivable and allowances for doubtful accounts). When do you add (or transfer) the balance in allowance for doubtful accounts to the Uncollectible Accounts Expense account?; I am guessing its at the end of the period when you are making your income statement but I'm still confused a little bit on the whole thing. If you could put a whole step by step process for this that would help me a lot (including the journal entries).