This document discusses the evolution of tax structures for businesses from the start-up phase through expansion. It outlines the pros and cons of operating as an unincorporated business versus incorporating. Incorporating provides benefits like lower tax rates but also more compliance costs. As businesses grow, they may use holding companies which provide tax deferral, asset protection, and opportunities for income splitting. Holding companies allow for preserving tax attributes like paid-up capital and pushing debt down to the operating company level. The document also discusses considerations for expanding operations internationally through the use of holding companies and foreign subsidiaries.