Idaho Source Income

  • Idaho resident: Taxed on income from all sources
  • Idaho nonresident: Taxed on Idaho source income
  • Part-year Idaho residents: Taxed on income received while an Idaho resident.
  • Tax is also due on Idaho source income received any time during the year while not residing or domiciled in Idaho.
Idaho source income defined

Idaho source income is income from:

  • Transactions or activities that take place in Idaho, or
  • Property in Idaho

Idaho compensation

Compensation is income from wages and salary and other amounts your employer pays you for the services you perform. Compensation for services performed in Idaho is Idaho source income. If you:

  • Work only in Idaho during the year: All your compensation is Idaho compensation.
  • Work only outside Idaho during the year: You have no Idaho compensation.
    Note: All compensation received while you’re domiciled or residing in Idaho is taxable by Idaho. Learn more on our Idaho Residency Status page.
  • Work both in and outside Idaho during the year: You or your employer must compute an Idaho compensation percentage. You can then calculate your Idaho compensation from that job.

Your W-2 form should show your compensation from Idaho and any other states.

To compute your Idaho compensation, divide Idaho work days by total work days

  • Work days include only those days you provided personal services for your employer. Don’t include any days off when you didn’t provide personal services for your employer (e.g., holidays, vacation).
  • Idaho work days are the total days you worked in Idaho for a particular employer during the year.
  • Total work days are the total days you worked for that employer both in and outside Idaho during the year.

Tip: Generally, if you work a five-day work week all year, you’ll have 260 total work days. Subtract any vacation, holidays, sick leave days, and other days you take off.

Special rules apply in computing compensation from stock options and severance pay.