Why do I have to use deluxe?

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You may or may not need the Deluxe upgrade.  It depends on your sources of income and deductions.  From the TurboTax website:

Simple tax situations covered in TurboTax Free Edition:

• W-2 income
• Limited interest and dividend income reported on a 1099-INT or 1099-DIV
• Claiming the standard deduction
• Earned Income Tax Credit (EIC)
• Child tax credits

Situations not covered in TurboTax Free Edition include:

• Itemized deductions
• Business or 1099-MISC income
• Stock sales
• Rental property income
• Credits, deductions and income reported on schedules 1-6, such as the Student Loan Interest Deduction