Tax rate used in calculating Idaho state tax for year 2021State Abbreviation: | ID | State Tax Withholding State Code: | 16 | Acceptable Exemption Form: | W-4 | Basis For Withholding: | State or Federal Exemptions | Acceptable Exemption Data: | S, M / Number of Exemptions | TSP Deferred: | Yes | Special Coding: | None | Additional Information: | If a state income tax certificate has not been processed or if a valid state exemption code is not present, the Federal exemptions will be used in the computation of state tax. |
Withholding Formula >(Idaho Effective 2021)<- Subtract the nontaxable biweekly Thrift Savings Plan contribution from the gross biweekly wages.
- Subtract the nontaxable biweekly Federal Health Benefits Plan payment(s) (includes flexible spending account - health care and dependent care deductions) from the amount computed in step 1.
- Add the taxable biweekly fringe benefits (taxable life insurance, etc.) to the amount computed in step 2 to obtain the adjusted gross biweekly wages.
- Multiply the adjusted gross biweekly wages times 26 to obtain the annual wages.
- Determine the exemption allowance by applying the following guideline and subtract this amount from the annual wages to compute the taxable income.
Exemption Allowance = >$2,960< x Number of Exemptions
- Apply the taxable income computed in step 5 to the following table to determine the annual Idaho tax withholding.
Tax Withholding Table
Single | If the Amount of
Taxable Income Is: | The Amount of Idaho
Tax Withholding Should Be: |
Over:
| But Not
Over: | | | | Of Excess
Over: | | $ 0 | $ >12,400 | $ 0.00 | plus | 0.0% | $ 0 | | 12,400 | 13,968 | 0.00 | plus | 1.125% | >12,400 | | 13,968 | 15,536 | 18.00 | plus | 3.125% | 13,968 | | 15,536 | 17,104 | 67.00 | plus | 3.625% | 15,536 | | 17,104 | 18,672 | 124.00 | plus | 4.625% | 17,104 | | 18,672 | 20,240 | 197.00 | plus | 5.625% | 18,672 | | 20,240 | 24,160 | 285.00 | plus | 6.625% | 20,240 | | 24,160 | and over | 545.00 | plus | 6.925% | 24,160 |
Married | If the Amount of
Taxable Income Is: | The Amount of Idaho
Tax Withholding Should Be: |
Over:
| But Not
Over: | | | | Of Excess
Over: | | $ 0 | $ >24,800 | $ 0.00 | plus | 0.0% | $ 0 | | 24,800 | 27,936 | 0.00 | plus | 1.125% | >24,800 | | 27,936 | 31,072 | 35.00 | plus | 3.125% | 27,936 | | 31,072 | 34,208 | 133.00 | plus | 3.625% | 31,072 | | 34,208 | 37,344 | 247.00 | plus | 4.625% | 34,208 | | 37,344 | 40,480 | 392.00 | plus | 5.625% | 37,344 | | 40,480 | 48,320 | 568.00 | plus | 6.625% | 40,480 | | 48,320 | and over | 1087.00 | plus | 6.925% | 48,320 |
- Divide the annual Idaho tax withholding by 26 and round to the nearest dollar to obtain the biweekly Idaho tax withholding.
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