The balance in the supplies account before adjustment at the end of the year is $726. The proper adjusting entry if the amount of supplies on hand at the end of the year is $273 would be debit Supplies, $453; credit Supplies Expense, $453 debit Supplies, $273; credit Supplies Expense, $273 debit Supplies Expense, $273; credit Supplies, $273 debit Supplies Expense, $453; credit Supplies, $453