Quick answer
Kentucky has lower average 1BR rent ($1,090/mo vs $1,380/mo). State income tax: Kentucky (4.5%) vs Idaho (5.8%) — on a $120K salary that's $1,560/year difference.
State Comparison · 2026
Idaho vs Kentucky
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 Kentucky at a Glance
| Metric | Idaho | Kentucky |
|---|---|---|
| Avg 1BR rent (major metros) | $1,380 | $1,090 ✓ |
| Avg median home price | $445K | $260K ✓ |
| Cheapest city | Boise ($1,380) | Louisville ($1,080) ✓ |
| Priciest city | Boise ($1,380) | Lexington ($1,100) |
| State income tax | 5.8% | 4.5% ✓ |
| Avg walkability | 42/100 ✓ | 37/100 |
| 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: Kentucky (4.5%).
Salary $80K
$1,040
/year saved in Kentucky
Salary $120K
$1,560
/year saved in Kentucky
Salary $200K
$2,600
/year saved in Kentucky
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.
Kentucky (KY)
Tax reality
Kentucky has a flat 4% state income tax (being phased down to 3.5% and lower over time). Property tax is low (~0.83% effective). Sales tax 6%. No estate tax. Favorable tax environment.
Top cities (2 tracked)
Top drawbacks
- ✕Kentucky ranks in the bottom half of US states on most health metrics — obesity, smoking, opioid use, chronic disease. Healthcare exists in the metros but public health is weaker than average.
- ✕Rural Kentucky has significant economic distress from coal industry decline and opioid crisis aftermath. This affects the state's political climate and services.
- ✕Louisville has real public safety concerns in specific west-end neighborhoods. Most of east Louisville, the Highlands, and the core downtown/NuLu areas are generally fine.
Frequently Asked Questions
Is Idaho or Kentucky cheaper to live in?
Kentucky has lower average 1BR rent across major metros — $1,090/mo vs $1,380/mo in Idaho, a $290/mo difference. Home prices: Kentucky median is $260K vs $445K.
Idaho vs Kentucky: which has lower state income tax?
Kentucky has lower state income tax (4.5%) vs 5.8% in Idaho. On an $80K salary that's $1,040/year in savings. On $200K, savings grow to $2,600/year.
Should I move from Idaho to Kentucky?
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 Kentucky?
Idaho's largest metros include Boise. Kentucky's largest metros include Louisville, Lexington. Cost of living varies significantly within each state — a Idaho suburb can be 40% cheaper than its flagship city, and vice versa.