Two Methods: Determine Adjusted Gross Income for the Year Calculate Federal Taxable Income and Tax. To calculate federal income tax, you need to first estimate your adjusted gross income (AGI). Then, estimated taxable income is determined by subtracting allowable deductions and exemptions from AGI.
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1 Montana Department of Public Health and Human Services. 1400 Broadway PO Box 8005. Helena, MT 59604. 2  The phone number to call the Montana Medicaid office is 800-362-8312.  To view the website for Montana Medicaid online, click here.