Quick answer
Idaho has lower average 1BR rent ($1,380/mo vs $1,600/mo). State income tax: Washington (None) vs Idaho (5.8%) — on a $120K salary that's $6,960/year difference.
State Comparison · 2026
Idaho vs Washington
Side-by-side on state income tax, rent, home prices, climate, and top metros — with specific dollar numbers for every claim.
Last updated: April 23, 2026
Idaho vs Washington at a Glance
| Metric | Idaho | Washington |
|---|---|---|
| Avg 1BR rent (major metros) | $1,380 ✓ | $1,600 |
| Avg median home price | $445K ✓ | $570K |
| Cheapest city | Boise ($1,380) | Spokane ($1,100) ✓ |
| Priciest city | Boise ($1,380) | Seattle ($2,100) |
| State income tax | 5.8% | None ✓ |
| Avg walkability | 42/100 | 62/100 ✓ |
| Cities tracked | 1 | 2 |
✓ marks the lower or more favorable value. Averages use the major metros we track in each state.
State Income Tax: Real Savings
What the rate gap actually looks like in your paycheck. Lower rate: Washington (None).
Salary $80K
$4,640
/year saved in Washington
Salary $120K
$6,960
/year saved in Washington
Salary $200K
$11,600
/year saved in Washington
Calculation uses the effective state rate difference × gross salary. Doesn't include property tax, sales tax, or federal impact.
Deep Dive: Each State
Idaho (ID)
Tax reality
Idaho has a 5.8% flat state income tax (moderate). Property tax is low (~0.6% effective). Sales tax 6%. No estate tax. Overall moderate tax burden.
Top cities (1 tracked)
Top drawbacks
- ✕Housing growth has outpaced wage growth. Long-time Idaho residents have been priced out of Boise proper.
- ✕Summer wildfire smoke affects air quality regularly — July through September can have multiple weeks of AQI 150-200+.
- ✕Idaho is deeply conservative politically, with some policy shifts (abortion, LGBTQ+, religion in schools) recently tightening. Boise specifically leans moderate; the rest of the state is more conservative.
Washington (WA)
Tax reality
Washington has no state income tax on W-2 wages. The state collects revenue through a 6.5% state sales tax (local rates push it to 9-10% in most metros) and a Business & Occupation (B&O) gross receipts tax that affects self-employed workers. A 7% capital gains tax (passed 2021) applies only to gains over $250K on investments — so most people never hit it.
Top cities (2 tracked)
Top drawbacks
- ✕Cloud cover from October through April is serious — many newcomers experience genuine seasonal affective disorder (SAD). If you've never lived somewhere with low winter sunlight, test with a 2-week November visit before committing.
- ✕Home prices in Seattle proper have stayed high — $750K-$850K median for a modest SFH in decent neighborhoods. Bellevue and eastside tech suburbs run higher.
- ✕Sales tax 9-10% stings. Every purchase is noticeably more expensive than in no-sales-tax states like Oregon or Montana.
Frequently Asked Questions
Is Idaho or Washington cheaper to live in?
Idaho has lower average 1BR rent across major metros — $1,380/mo vs $1,600/mo in Washington, a $220/mo difference. Home prices: Idaho median is $445K vs $570K.
Idaho vs Washington: which has lower state income tax?
Washington has lower state income tax (None) vs 5.8% in Idaho. On an $80K salary that's $4,640/year in savings. On $200K, savings grow to $11,600/year.
Should I move from Idaho to Washington?
Idaho has a 5.8% flat state income tax (moderate). Property tax is low (~0.6% effective). Sales tax 6%. No estate tax. Overall moderate tax burden.
What are the best cities in Idaho vs Washington?
Idaho's largest metros include Boise. Washington's largest metros include Seattle, Spokane. Cost of living varies significantly within each state — a Idaho suburb can be 40% cheaper than its flagship city, and vice versa.