Total Assets include cash, accounts receivable, inventory, loans to shareholders, depreciable assets, land, and other assets. In order for the company's books to balance, this must match Total Liabilities and Owners Equity, which is the total of accounts payable, loans from shareholders, mortgages, stock, paid-in capital and other equity accounts.
You can see these accounts displayed on Form 1120S p3-5 Schedule L (even if you don't complete the balance sheet entries).
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