Idaho / Washington Dual-State Taxes | Live in Idaho, Work in Spokane

You live in Idaho. You work in Washington. Who gets your income tax?

It is the most common tax question in Coeur d'Alene, Post Falls, and Rathdrum — and the one people most often get wrong until it costs them.

The short answer most commuters get backwards

Washington has no personal income tax. Idaho does. So people who live in Coeur d'Alene or Post Falls and drive to a job in Spokane often assume their wages escape state income tax entirely.

They do not. Idaho taxes its residents on all of their income, no matter which state they earned it in. Cross the state line to work, and Idaho still expects its share of those wages.

Here is the part that stings: when you owe tax to two states, you normally claim a credit on your resident return for the tax you paid to the other one. But Washington charged you nothing — so there is no credit to claim. Your entire Spokane paycheck is exposed to Idaho tax with nothing to offset it.

If your employer is not withholding Idaho tax from a Washington paycheck — and many are not set up to — the bill arrives all at once in April.

Going the other direction: Washington resident, Idaho job

Live in Spokane Valley or Liberty Lake and work in Coeur d'Alene or Post Falls, and the math flips. Idaho taxes non-residents on income earned from work performed inside Idaho, which generally means filing an Idaho non-resident return for the income sourced there.

Your home state takes nothing, but Idaho still wants its portion of what you earned within its borders. People in this situation often skip the Idaho filing entirely because "Washington has no income tax" — and that is a filing obligation, not a tax-free pass.

Remote and hybrid work made this harder, not easier

The old rule of thumb was simple: your income was earned where your desk was. Hybrid schedules broke that. If you live in Hayden and work three days in a Spokane office and two days at your kitchen table, the days are not automatically treated the same way.

What matters is where the work was actually performed, and that requires records — not a guess made the following spring. If your schedule changed mid-year, or you switched from full-time in-office to hybrid, that is exactly the kind of year where a return prepared on autopilot leaves money on the table or creates exposure.

The year you move across the line

Moving from Spokane to Coeur d'Alene — or the reverse — usually makes you a part-year resident, which means income gets split between the period before the move and the period after. Establishing residency is not simply a matter of the date on your lease; states look at where you actually live, register vehicles, vote, and keep your primary home.

Get the split wrong and you either overpay or invite a question you would rather not answer. The move year is the single highest-risk return in a cross-border situation, and it is worth handling deliberately.

Where dual-state situations get expensive

No Idaho withholding on a Washington paycheck

Washington employers have no reason to withhold Idaho tax. If nobody sets it up, nothing is withheld all year and the balance lands in April — sometimes with underpayment penalties attached.

Assuming no credit is needed

The credit for taxes paid to another state only helps when the other state actually taxed you. Washington did not, so Idaho residents get no relief on Washington-earned wages.

Skipping the non-resident return

Washington residents earning income inside Idaho frequently assume they have no state filing at all. Idaho generally disagrees.

A spouse in each state

Two earners, two states, one joint return. This is common around Coeur d'Alene and Spokane, and it is genuinely fiddly — the wrong allocation is easy to make and easy to miss.

Selling property across the line

Sell a rental or a residence in one state while living in the other and the gain has to be sourced correctly. Washington also imposes its own capital gains excise tax on certain high-value sales, which surprises people who moved there expecting no income tax of any kind.

Running a business in both states

Serving customers on both sides of the border can create filing obligations in both. Washington's business & occupation tax applies to gross receipts, not profit, which catches Idaho owners expecting a profit-based tax.

Why work with someone licensed on both sides

Serving Coeur d'Alene, Hayden, Post Falls, Rathdrum, Sandpoint, and the Spokane area.

I hold real estate licenses in both Washington and Idaho and prepare taxes as a PTIN-registered preparer. That combination matters here specifically, because so many cross-border situations in this corridor are tied to property: a rental kept in Spokane after moving to Coeur d'Alene, a primary residence sold in the move year, an investor buying on whichever side of the line the numbers favor.

Most of the pain in dual-state filing comes from decisions made months before the return — withholding that was never set up, a move date nobody documented, a mileage log that does not exist. Handled in advance, it is routine. Handled in April, it is a scramble.

This page is general education about how these situations commonly work, not advice about your specific circumstances. Residency, sourcing, and filing requirements turn on details that deserve an actual conversation.