Is it cheaper to live in Idaho or Washington?

There is no single answer, because the two states are cheap in different places. On housing, the Washington side wins clearly right now: Spokane’s median asking price was $449,000 as of June 2026, against $749,900 in Coeur d’Alene. On taxes, it depends on your income — Washington has no personal income tax, while Idaho taxes wages but generally charges less on property and at the register. The honest answer is that the bottom line moves household by household.

Housing: the Washington side is cheaper, and it’s not close

The June 2026 numbers across the I-90 corridor tell the story. Spokane listed at a median of $449,000 and $217 per square foot, Spokane Valley at $465,000 and $219, Cheney at $470,000, and Airway Heights at $394,900. Cross into Kootenai County and the same month shows Post Falls at $577,900 and $296 per square foot, Hayden at $799,999, and Coeur d’Alene at $749,900 and $383 per square foot.

That per-square-foot gap is the part most relocation calculators miss. A comparable house can cost meaningfully more ten minutes east of the state line, and demand on the Idaho side stays firm — 46% of Post Falls listings were under contract as of June 2026. If housing is your biggest line item, and for most people it is, Washington is the cheaper side right now. The Coeur d’Alene cost-of-living breakdown goes deeper on why CDA carries a premium.

Taxes: it depends on how you earn

The structural differences are stable even when rates change. Washington has no personal income tax on wages; it leans on a higher sales tax, higher gas tax, and a graduated real estate excise tax paid by sellers, plus an estate tax. Idaho has a state income tax, but property taxes generally run lower and Idaho offers a homeowner’s exemption on an owner-occupied primary residence.

In rough terms: high wage earners often come out ahead in Washington because the income-tax savings dominate. Households with modest taxable income, or retirees whose income skews toward Social Security (which Idaho exempts), often do better in Idaho. We’ve laid out the full picture in Washington vs Idaho taxes explained and the longer side-by-side tax comparison. Rates and brackets shift, so verify current figures with the Washington Department of Revenue, the Idaho State Tax Commission, and the county assessor — and run your own numbers with a CPA before you let taxes pick your state.

The cross-border move people actually make

Because the metro is one commute shed, plenty of people split the difference. Liberty Lake to Post Falls is about ten minutes on I-90; downtown Spokane to downtown Coeur d’Alene is roughly 35. Some buyers live in Idaho and work in Washington, or the reverse, and the right combination changes the math again. We write both Washington and Idaho contracts every month, so we see the closing costs, excise tax, and property tax bills on both sides in real time — the current numbers for each market are on our market reports page.

This is general information, not tax advice. If you want to walk through what the move would actually cost for your situation, reach out and we’ll run the comparison with you.