Large corporations leverage sophisticated corporate income taxation planning tools that smaller businesses cannot access economically. Specifically, Fortune 500 tax departments deploy transfer pricing structures, foreign tax credit optimization, R&D credit studies, cost segregation analyses, and clean energy credit transfers simultaneously — each tool reducing effective rates incrementally. Additionally, large corporations spread fixed tax planning costs across much larger revenue bases, making the investment economical at scale. Conversely, small businesses face the same 21% statutory rate but access far fewer credit opportunities and carry proportionally higher compliance costs. Furthermore, the §250 GILTI deduction and IRA credit transferability provisions disproportionately benefit large corporations with international operations and significant capital investment capacity — structural advantages the IRC does not provide equivalents for at the small business level.