As a new form of economic organisation, the platform economy has had a significant impact on corporate behaviour. This study takes an incomplete contract perspective and examines whether the corporate platform transformation process incentivises tax compliance by constructing indicators for platform transformation. These results indicate that corporate platform transformation significantly promotes tax compliance behaviour. This conclusion holds, even after a series of robustness tests. The aforementioned effects are also constrained by management incentive levels, tax incentives, corporate nature, and the level of platform economy development. Further mechanism tests reveal that platform transformation generates tax compliance effects by addressing the incompleteness of contracts between shareholders and management, as well as between the enterprise and external investors. The regression results of the moderating effect model suggest that media supervision and executive academic backgrounds positively motivate the relationship between corporate platform transformations and tax compliance. This study provides valuable insights and implications for optimising the internal governance structures of platform enterprises, reducing tax losses, improving the tax system, and promoting the healthy development of the platform econcomy.