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How to Calculate 2021 Colorado State Income Tax by Using State Income Tax Table

1. Find your income exemptions

2. Find your pretax deductions, including 401K, flexible account contributions ...

3. Find your gross income

4. Check the 2021 Colorado state tax rate and the rules to calculate state income tax

5. Calculate your state income tax step by step

6. If you want to simplify payroll tax calculations, you can download ezPaycheck payroll software, which can calculate federal tax, state tax, Medicare tax, Social Security Tax and other taxes for you automatically. You can try it free for 30 days, with no obligation and no credt card needed.

Learn more about the in house payroll tax solution for Colorado small businesses here.
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Colorado State Tax Tables

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2025 Colorado State Tax Witholding Table
2024 Colorado State Tax Witholding Table
2023 Colorado State Tax Witholding Table
2022 Colorado State Tax Witholding Table
2021 Colorado State Tax Witholding Table
( 2020   2019   2018   2017   2016   )

Tax rate used in calculating Colorado state tax for year 2021

State Abbreviation:

CO

State Tax Withholding State Code:

08

Acceptable Exemption Form:

None

Basis For Withholding:

Federal Exemptions

Acceptable Exemption Data:

None

TSP Deferred:

Yes

Special Coding:

None

Additional Information:

A state tax certificate is not required since Federal exemptions are used in the computation of the state formula.


Withholding Formula >(Colorado Effective 2021)<
  1. Subtract the nontaxable biweekly Thrift Savings Plan contribution from the gross biweekly wages.

  2. Subtract the nontaxable biweekly Federal Health Benefits Plan payment(s) (includes dental and vision insurance program, and flexible spending account - health care and dependent care deductions) from the amount computed in step 1.

  3. Add the taxable biweekly fringe benefits (taxable life insurance, etc.) to the amount computed in step 2 to obtain the adjusted gross biweekly wages.

  4. Multiply the adjusted gross biweekly wages times 26 to obtain the gross annual wages.

  5. Determine the exemption allowance by applying the following guideline and subtract this amount from the gross annual wages to compute the taxable income.

    6. Exemption Allowance = $4,000 (for Single) or $8,000 (for Married)

  6. Apply the taxable income computed in step 5 to the following table to determine the annual Colorado tax withholding.

    7. Tax Withholding Table

    If the Amount of
    Taxable Income Is:

    The Amount of Colorado
    Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $      0
    >and over
    $  0
    plus
        4.63%
    $      0



  7. Divide the annual Colorado tax withholding by 26 and round to the nearest dollar to obtain the biweekly Colorado tax withholding.

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Click here to view the step by step guide on
How to Calculate Colorado State Income Tax Withholdings Automatically

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