Which of the following tax forms can TurboTax assist you in filing?

TurboTax is designed to assist individuals in filing their personal income tax returns, and it specifically supports various versions of the Form 1040, including 1040-A and 1040-EZ. These forms are used by individuals to report their income and calculate their tax liability on a federal level. Additionally, TurboTax can help users navigate the complexities of state tax forms, which vary between different states, ensuring compliance with local tax regulations.

The other forms mentioned, such as the W-2 and 1099, are forms used to report income and are not filed by the taxpayer directly, but rather issued by employers and other entities. Schedules like Schedule C and Schedule SE are related to self-employment income, which TurboTax does support, but they are typically filed as part of the overall 1040 form setup. Forms 990 and 1120 relate to nonprofit and corporate tax returns, respectively, which are outside the personal tax focus of TurboTax. Thus, the correct answer encompasses the forms that TurboTax is primarily designed to help individual taxpayers file while addressing their federal and state tax needs.