differences in chart of Accounts under periodic and perpetual systems. differences in chart of Accounts under periodic and perpetual systems. differences in chart of Accounts under periodic and perpetual systems. Solution Periodic accounting In periodic inventory system, the raw materials and other inventory along with cost of goods sold is updated periodically. Basically each purchase of inventory is recorded in single journal entry. Cost of goods sold account does not exist during the accounting period. Total inventory and COGS account are reconciled and determined at the end of the accounting period Perpetual accounting As the name suggests perpetual accounting, the inventory and cost of goods sold is continuously updated as the purchase and sales happen. Purchases are directly debited from accounts such as inventory while cost of goods sold is recorded separately. .