Net Investment Income Tax (NIIT)

100% Free Federal. $14.99 State. Direct IRS E-File. FreeTaxUSA.com Concise Takeaway NIIT is a 3.8% tax on net investment income for individuals, estates, and certain trusts whose modified AGI exceeds statutory thresholds. Who NIIT Applies To NIIT applies to: U.S....

Alternative Minimum Tax (AMT)

100% Free Federal. $14.99 State. Direct IRS E-File. FreeTaxUSA.com Concise Takeaway AMT is a parallel tax system that removes certain deductions and preferences. If the tentative minimum tax is higher than regular tax, the taxpayer pays AMT. Purpose of AMT AMT applies...

Tax Calculation and Additional Taxes

100% Free Federal. $14.99 State. Direct IRS E-File. FreeTaxUSA.com Concise Takeaway Federal income tax moves through a simple sequence: taxable income → tax → credits → additional taxes → total payments → refund or balance due. Tax Calculation Overview Federal income...

Additional Deductions (2025–2028)

100% Free Federal. $14.99 State. Direct IRS E-File. FreeTaxUSA.com The One Big Beautiful Bill Act created four temporary additional deductions available from 2025 through 2028. These deductions apply whether the taxpayer itemizes or claims the standard deduction and...