2026 official-source estimate
Estimate Idaho withholding from the current official percentage tables, Form ID W-4 allowances, federal income tax, and FICA.
Quick answer
Idaho: Estimate Idaho withholding from the current official percentage tables, Form ID W-4 allowances, federal income tax, and FICA. This 2026 calculator combines that state treatment with federal withholding and FICA, while showing supported employee-paid programs and known exclusions explicitly.
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Included
Limitations
Enter gross pay for one pay period, federal W-4 adjustments, and the state details shown above. Federal withholding follows Publication 15-T. Idaho reduces current wages by the pay-period child-tax-credit allowance value for each Form ID W-4 allowance, subtracts the official threshold for the selected withholding status, applies 5.3%, and rounds the percentage-table result to the nearest whole dollar before adding the employee’s whole-dollar additional amount.
Example: Idaho’s official example uses $1,212 of biweekly wages, single-rate status, and four allowances. After subtracting $595.08 of allowance value, 5.3% of the amount over $577 rounds to $2 of Idaho withholding. The calculator does not assume any unentered benefit deduction or invent a tax result.
Weekly, biweekly, semimonthly, and monthly are the supported paycheck frequencies. “Annual salary” is an earnings input and the annual view is a simple period multiplication; neither is an annual payroll-period method. The special Form W-4 adjustment for nonresident aliens is not modeled.
State paycheck questions
Federal withholding follows Publication 15-T. Idaho reduces current wages by the pay-period child-tax-credit allowance value for each Form ID W-4 allowance, subtracts the official threshold for the selected withholding status, applies 5.3%, and rounds the percentage-table result to the nearest whole dollar before adding the employee’s whole-dollar additional amount.
Included in this estimate: Federal income tax withholding; Social Security and Medicare; Current Idaho 5.3% percentage-computation table; Form ID W-4 status and child-tax-credit allowances; Whole-dollar additional withholding and valid exemption elections.
Not included in this estimate: Nonresident-alien treaty calculations; Military-spouse exemption eligibility advice; Supplemental-wage flat-rate elections; Unentered employer benefits and unsupported deduction treatments.
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