2026 tax year · Idaho
RSU tax in Idaho
A $60,000 vest costs $3,180 in Idaho tax on top of the federal bill. And the federal share withheld is $2,970 short.
What a $60,000 vest actually costs in Idaho
A single filer already earning $180,000 in salary. The vest stacks on top of that, so it fills the highest brackets rather than starting at the bottom:
| Withheld by your employer at 22.0% | $13,200 |
| Federal tax the vest actually costs | $16,170 |
| Federal shortfall, owed in April | $2,970 |
| Idaho income tax on the vest | $3,180 |
| Total still to find | $6,150 |
The withholding rate is flat, 22.0% below $1 million of supplemental pay. And takes no account of your salary. That is why the gap grows the more you earn.
The gap widens with salary
| Salary | Withheld | Actually owed | Shortfall | Idaho tax |
|---|---|---|---|---|
| $90,000 | $13,200 | $13,764 | $564 | $3,180 |
| $160,000 | $13,200 | $14,570 | $1,370 | $3,180 |
| $260,000 | $13,200 | $20,630 | $7,430 | $3,180 |
How Idaho treats a vest
Idaho taxes a vest as ordinary income like any other wages, adding $3,180 on top of the federal bill for $60,000 of vesting stock.
If you moved during the vesting period, the income is split between the states you worked in across it: Days worked in each state / total days in vesting period x RSU income = each state's allocation That is worked out day by day, not by where you lived on the vesting date.
Idaho specifics that change the number
Idaho is a community property state. In community property states, income earned during marriage is generally owned equally by both spouses. This affects QJV eligibility, MFS filing strategies, and retirement account contribution rules.
What the same vest costs around Idaho
Total income of $240,000 in the states Idaho borders:
| State | Its tax | vs Idaho |
|---|---|---|
| Nevada | No income tax | −$12,720 |
| Washington | No income tax | −$12,720 |
| Wyoming | No income tax | −$12,720 |
| Utah | $10,800 | −$1,920 |
| Montana | $12,532 | −$189 |
| Oregon | $19,708 | +$6,988 |
- Nevada has no income tax at all, so the same work done there costs $12,720 less in state tax than it does in Idaho.
- Washington has no income tax at all, so the same work done there costs $12,720 less in state tax than it does in Idaho.
- Wyoming has no income tax at all, so the same work done there costs $12,720 less in state tax than it does in Idaho.
- Utah would take $1,920 less, $10,800 against Idaho's $12,720.
- Montana would take $189 less, $12,532 against Idaho's $12,720.
- Oregon would take $6,988 more, $19,708 against Idaho's $12,720.
RSU questions in Idaho
Should I sell at vest?
Selling immediately raises the cash for the $6,150 you still owe and leaves no capital gain, because the sale price equals the price you were already taxed on. Holding turns it into an investment decision, any further gain is a capital gain, and any fall is a loss you take on shares you were already taxed on at the higher value.
I moved to Idaho mid-vest, who taxes it?
Both states, split by workdays. The income is allocated across the vesting period, not assigned to wherever you happened to live on the vesting date. The state you left can still claim its share, and California, New York and Massachusetts pursue it hardest.