What is the primary purpose of Intuit TurboTax?

The primary purpose of Intuit TurboTax is to help individuals prepare and file their federal and state income tax returns. This software is designed specifically for individual taxpayers, providing a user-friendly interface and step-by-step guidance to ensure that users can accurately report their income, claim deductions, and take advantage of credits available to them. TurboTax streamlines the tax preparation process, making it easier for users to navigate forms, understand tax laws, and file their returns.

While the other options touch on aspects related to finance and taxation, they do not accurately reflect the main focus of TurboTax. Assisting in business investments, calculating corporate tax rates, and providing accounting software for businesses are not the driving purposes of TurboTax, which remains focused on simplifying tax preparation for individuals. The software's core functionality is tailored to individual tax needs, ensuring compliance with tax regulations while maximizing potential refunds or minimizing liabilities for personal income taxes.