How do you write a journal entry for a insufficient funds check?

To write a journal entry for an insufficient funds check, you need to reverse the original transaction that recorded the deposit. Debit the Cash account to reflect the decrease in cash, and credit the Accounts Receivable (or the relevant account) to indicate the outstanding amount owed. Additionally, you may want to record a fee expense if your bank charges you for the insufficient funds. This ensures that your financial records accurately reflect the current situation.