Yes. Idaho treats bonuses as taxable wages and requires Idaho income tax withholding on bonus and other supplemental wage payments. Unlike some states that use complex withholding tables for bonuses, Idaho allows a simplified method for separately paid supplemental wages.
When a bonus is paid separately from regular wages, Idaho withholding may be calculated by applying a flat rate to the bonus amount. You can use the calculator above, powered by Beyond, to estimate Idaho withholding and take-home pay for bonus payments. The calculator uses a 2026 estimate based on Idaho withholding guidance and current payroll assumptions.
How to Calculate Bonus Tax in Idaho
Supplemental wages—including bonuses, commissions, overtime pay, back pay, and certain additional wage payments—are generally treated as wages for withholding purposes.
For Idaho state withholding:
– Paid separately from regular wages: employers may calculate withholding by applying a flat rate of approximately 5.3% to the bonus amount
– Paid together with regular wages: withholding may be calculated on the total combined wages for the payroll period using standard Idaho withholding methods
– Actual withholding may vary depending on payroll setup, employee elections, and Form ID W-4 allowances
For federal withholding:
– 22% applies to most supplemental wages
– 37% applies to supplemental wages above $1 million in a calendar year
Key Information on Idaho Bonuses
How Are Bonuses Paid in Idaho?
Employers may issue bonuses through:
– Check
– Direct deposit
– Pay card
How Do Bonuses Work?
Bonuses are treated as taxable compensation. They are generally subject to:
– Federal income tax withholding
– Idaho income tax withholding
– Social Security tax
– Medicare tax
They are typically reported on the employee’s Form W-2 at year-end.
What Is the Idaho Bonus Tax Rate?
Idaho generally uses a flat supplemental withholding rate for bonuses paid separately from regular wages. For 2026, this is approximately 5.3%.
When bonuses are combined with regular wages, Idaho withholding follows standard withholding calculations based on Form ID W-4 elections and payroll frequency.
Are Bonuses Taxed Differently Than Standard Pay?
At the Idaho level, bonuses are still taxable wages, but withholding may be calculated differently depending on how the bonus is paid.
At the federal level, bonuses may also be taxed using the supplemental wage method, typically 22% when paid separately, subject to the higher $1 million rule.
How Much Tax Is Taken Out of a Bonus?
For most bonus payments in Idaho, estimated withholding may include:
– Idaho income tax withholding (often ~5.3% for separately paid bonuses)
– 22% federal supplemental withholding in most cases
– FICA taxes, including Social Security and Medicare
Because Idaho withholding can vary based on payroll setup and employee elections, the exact amount taken from a bonus may differ from one employee to another.
Important
This calculator is provided for informational and estimation purposes only. Actual payroll tax withholdings may vary based on an employee’s tax elections, Form ID W-4 details, payroll setup, and other factors. Employers should consult a qualified tax, legal, or payroll professional for official calculations.
If you need help with payroll processing, withholding setup, or tax compliance in Idaho, the Beyond team is available to help.
Estimate only — not legal or tax advice. Need help managing Idaho payroll more confidently? Contact Beyond HCM for support.
