Where a preferred issue appears depends on its redemption terms. Regulation S-X Rule 5-02.28 covers preferred stock that cannot be redeemed, or that only the issuer can choose to redeem, and it is reported within stockholders' equity, usually tagged PreferredStockValue or PreferredStockIncludingAdditionalPaidInCapital. Rule 5-02.27 covers preferred stock that must be redeemed on a set date, can be redeemed at the holder's option, or can be redeemed under conditions the issuer does not control. The SEC requires that it be kept out of stockholders' equity and shown between liabilities and equity, often called temporary or mezzanine equity, tagged TemporaryEquityCarryingAmountAttributableToParent. Under ASC 480, shares the company is unconditionally obligated to redeem are classified as liabilities instead.
These classifications mean the same economic security can appear in three places on different balance sheets, so it is worth reading the equity and redeemable stock footnotes before comparing companies. The carrying amount can also differ from the redemption or liquidation value, which is disclosed separately.
For common shareholders, preferred equity is a senior claim. Analysts subtract it from total equity to get common equity and book value per common share, subtract preferred dividends from net income to get earnings available to common, and add it to debt and common equity when computing enterprise value or total capital. Convertible issues also matter for dilution, because they may turn into common shares.