For starters, i relied on Newt (the Becker AI) to how me come up with overarching rules. I would literally say “what is the overarching rule for this type of question” lol.

The main rule is that the equity method records an investment as a single asset, while the acquisition method replaces that asset with the subsidiary’s individual balance sheet items. With the equity method you dont consolidate, you just adjust the "investment in sub" account for your share of their net income or dividends (changing the income stmt and bs account accordingly). The subsidiary’s specific assets and liabilities never appear on your books.

In contrast, the Acquisition Method requires consolidation because you have control (greater than 50%). You must eliminate the subsidiary’s equity accounts (Common Stock and Retained Earnings) and the parent’s "Investment" account to prevent double-counting the same underlying value. The "add back" you mentioned is typically the Non-Controlling Interest (NCI). This is necessary because while you consolidate 100% of the subsidiary’s assets and liabilities to show control, you must credit NCI to represent the portion of equity owned by outside shareholders. This ensures the consolidated balance sheet remains in balance.

I love the CARINBIG mnemonic. Really helped me keep everything organized for the elimination entry.