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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Montana Department of Revenue Address and Contact Number Montana Department of Revenue Contact Phone Number is : +1 (866) 859-2254, 406-758-5700, (406) 444-2830 and Address is 100 Financial Dr, Kalispell, Mt, United States Montana Department of Revenue is a governmental department that works under the state government of Montana.