WA -> Idaho Investing - Property & Income Tax Impact?

[Eric F.]

I live in Washington near the border to Idaho. I'm interested in investing in Idaho, but I have zero experience with Idaho taxes (or state income tax at all for that matter).

Questions:

• I've heard that property taxes in Idaho are higher for out of state owners vs. residents (i.e. a house could cost $2K in annual taxes for a resident, but may be $3K for an out-of-state owner).
  • Is this true or just rumor?
  • If so, by what %?
• Is my rental income from an Idaho property subject to Idaho state income tax?
  • If so, does Idaho state income tax impact my Federal tax return at all (i.e. taxed twice?)
• Are there any other cross-state pros or cons for investing from WA -> ID?