Microsoft (and other international companies) go to great lengths to optimize and defer taxes into the future. As the US already has among the highest corporate

Microsoft (and other international companies) go to great lengths to optimize and defer taxes into the future. As the US already has among the highest corporate tax rates in the world not much would change as all international revenue is being held overseas anyhow. There would be changes in how they allocate their resources but only a CFO might be able to tell you what those would be.