The equity section of a corporate balance sheet generally contains these accounts:
- Common stock (at par)
- Additional paid-in capital
- Retained earnings
In addition, it may contain any of these accounts:
- Preferred stock (at par)
- Other comprehensive income (OCI)
- Treasury stock (a negative value)
Common stock is the number of shares of stock that the company issued, multiplied by the par value. (The par value is, essentially, a random number that the company chose before they sold any stock; it generally has nothing to do with the price investors pay for the stock. It’s usually a round number, such as $10/share, or $50/share.)
Additional paid-in capital is money that investors paid the company above the par value of the stock. If the par value were $10/share, and in the IPO investors bought stock for $30/share, then the additional paid-in capital would be $20/share (= $30/share – $10/share) multipied by the number of shares issued.
Retained earnings is the accumulated net income that hasn’t been paid out in dividends.
If a company buys back its own stock, that goes into the Treasury stock account. This is an unusual account: its balance is a negative number; it reduces equity. If the company bought back 1,000 shares of its stock, and that stock has a par value of $100/share, then its equity section will list Treasury stock with a value of ($100,000): negative $100,000. (If they pay some price other than $100/share on the open market when they repurchase the shares, I believe that the difference goes into additional paid-in capital. It’s been a long time since I got my accounting degree, so I may be mistaken on this, but it sounds reasonable.)
Thus, if a company issues $1,000,000 in bonds (a liability) and uses that money to repurchase its own shares, then its liabilities will increase by $1,000,000 (bonds payable), and its equity will decrease by $1,000,000 (Treasury stock and paid-in capital).