Not tax advice — a map. These are the structural differences that show up in real closings on both sides of the state line, laid out so your CPA conversation starts informed instead of from scratch.
What Would My Home Net, Either Side →Structure first, rates second — the structure is what most people have never seen laid out:
| Tax | Washington | Idaho |
|---|---|---|
| Tax when you SELL a home | Graduated excise (REET): 1.1% to $525K, 1.28% above, + 0.25–0.5% local — roughly $7,700–$9,100 on a $565K sale | None. No state or county transfer tax, and counties are barred from creating one |
| Personal income tax | None on wages | Yes — a flat-rate individual income tax |
| Sales tax | Higher combined state + local rates; groceries exempt | 6% state rate; groceries taxed but offset by a per-person grocery tax credit |
| Property tax structure | Includes a state school levy on top of local levies | No state-level property tax — local districts only, with a homeowner's exemption shielding part of a primary residence's value |
| Primary-residence break | Limited programs (seniors/disabled deferrals) | Homeowner's exemption on owner-occupied homes: 50% of value up to a statutory cap, plus a circuit-breaker program for qualifying seniors |
Washington REET verified against the Washington Department of Revenue's published graduated schedule; Idaho's absence of a transfer tax verified against Idaho code. Rates change — confirm current figures before contracting. Property-tax specifics vary by district and year on both sides; the assessor's office and your CPA hold the current numbers.
The honest version of “which state has lower taxes” is: for whom? Washington's no-income-tax advantage scales with income — a high W-2 earner gives up a real annual sum crossing into Idaho, and should know that number before falling in love with a lake view. Idaho's advantages are event-based and ownership-based: nothing skimmed off the sale when you eventually sell, a lighter combined sales-tax bite year to year, and a property-tax system with no state layer and a meaningful primary-residence exemption.
That's why the same move pencils differently for different households. A retiree with modest taxable income keeps most of Washington's headline advantage anyway — and gains Idaho's ownership-side breaks. A peak-earnings professional pays real money for the same crossing. And a Spokane worker who moves to Post Falls but keeps the Washington job needs the most careful look of all, because income earned in Washington and a home owned in Idaho each pull their own thread.
The one number that surprises everyone: sellers on the Washington side discover the excise tax at net-sheet time. If a WA→ID move is anywhere in your future, that five-figure line belongs in your planning now, not at closing.
Really. No transfer tax, no excise tax, state or county — and Idaho law prevents counties from inventing one. Your Idaho selling costs are commission, title, escrow and prorations; the line Washington sellers pay simply doesn't exist.
Graduated: 1.1% of the sale price up to $525,000, 1.28% on the portion above (higher tiers apply to multi-million-dollar sales), plus a local 0.25–0.5%. On a $565,000 sale that's roughly $7,700–$9,100, seller-paid.
That's the cross-border commuter's core question, and it involves how each state sources wage income plus Idaho's treatment of its residents' out-of-state earnings. It has a knowable answer for your situation — from a CPA, before you commit. My job is making sure the question gets asked early, and pricing the housing side of the trade accurately.
The structures differ more than any one-line comparison can capture: Washington adds a state school levy on top of local rates; Idaho runs local-only with a homeowner's exemption shielding part of an owner-occupied home's value. Actual bills depend on your district, levies and assessed value on either side — compare real parcels, not averages. I'll pull the actual figures for any home you're considering.
Depends almost entirely on your income mix. High wage income favors Washington year to year; ownership costs, sales taxes and the eventual sale favor Idaho. The crossover point is personal — which is the honest reason this page is a map and your CPA holds the calculator.
Jeff Kanally — Broker, Epique Realty. Licensed in Idaho & Washington, serving Coeur d'Alene, Post Falls, Hayden, Rathdrum & the greater Spokane area. Tax structures summarized from published state sources; rates and caps change and individual outcomes vary. General information, not an appraisal, and not tax or legal advice — confirm tax questions with a CPA and current figures with the relevant county.