This study explores the challenges and opportunities brought by tax automation to corporate financial management in America. In terms of challenges, the article points out the complexity and variability of tax regulations, the stability and security requirements of tax information systems, and the need to enhance professional competence in tax accounting. In terms of opportunities, tax automation has significantly improved financial work efficiency, reduced compliance risks, promoted the rationality of tax planning, and enhanced the market competitiveness and risk resistance of enterprises. To address these challenges and fully utilize opportunities, the article proposes a series of measures, including deepening the study of tax regulations, automating salary and tax processes, dynamically monitoring financial and tax policies, optimizing salary and tax planning, and utilizing big data technology for in-depth financial analysis to promote the optimization and upgrading of enterprise financial management.