Why Wealthy Washingtonians Are Relocating To Arizona After Washington’s New Millionaire Tax

A tax change can flip a relocation story fast. That’s what’s happening in Washington. Wealthy households, founders, investors, and luxury homeowners now have a new reason to look at Arizona, because Washington signed a new 9.9% tax on income over $1 million, while Arizona still offers a 2.5% flat individual income tax, no state estate tax, lower effective property taxes, and more house for the money. That’s the real story here. It’s not about average households. It’s about affluent Washington residents running the numbers again.

Quick Points

• Washington signed a new 9.9% tax over $1 million
• Arizona keeps a 2.5% flat income tax
• Arizona has no state estate tax
• Redfin showed Seattle far above Phoenix on price
• Wealthy Washington residents are rethinking domicile

Why Washington’s New Millionaire Tax Changed The Math

This is the hook. Washington Governor Bob Ferguson signed SB 6346 on March 30, 2026. The law creates a 9.9% tax on income above $1 million, effective for tax years beginning January 1, 2028, with first returns and payments due in 2029. The source material states that supporters say it will affect less than 0.5% of Washingtonians. That tells you who this is really about. High earners. Founders. Investors. Luxury homeowners with large annual income and long planning horizons. Once Washington moved away from its long-held no-income-tax image for top earners, Arizona became a more serious option for affluent households looking at where to live next.

• Signed March 30, 2026
• Starts January 1, 2028
• 9.9% over $1 million
• Affects top earners

That’s why this topic matters for Google search, too. People in Washington are asking why wealthy residents are moving to Arizona, and the answer starts with this law.

Why Wealthy Washington Residents Are Looking At Arizona

You can boil the appeal down to a few numbers. The source says Arizona offers a 2.5% flat individual income tax. It also says Arizona has no state estate tax or inheritance tax. For a wealthy household, that matters over time. A move like this often has less to do with one home purchase and more to do with future income, portfolio gains, business income, and family wealth planning. Arizona reads cleaner on that sheet, and that is a big reason affluent Washington residents are giving it a hard look.

• Flat 2.5% income tax
• No estate tax
• No inheritance tax
• Cleaner long-term planning

That’s the point. Arizona gives wealthy movers a place where the tax picture stays simpler, and that tends to carry weight with people who have a lot to protect.

What Washington Residents Need To Notice About Residency

This part matters a lot. The source explains that resident individuals allocate all income to Washington, while nonresidents are taxed only on Washington-source income. It also says that for affluent households, a true change of domicile matters, and simply buying a second home in Arizona does not do the same thing. That means wealthy Washingtonians aren’t only shopping for a getaway spot. They’re thinking about real relocation. They’re thinking about where primary residence, tax residency, and long-range planning should sit.

• Domicile matters
• Residency rules matter
• Second homes change less

That’s a big difference. It shifts the conversation from vacation property to full-time relocation, and that’s one reason Arizona is getting more attention from high-income Washington households.

Why Arizona’s Carrying Costs Help The Case

High-income households still care about recurring costs. They may care even more, because they’re often carrying larger homes and more assets. The source cites Tax Foundation 2026 data showing Arizona’s effective property-tax rate at 0.44% of owner-occupied housing value, compared with 0.75% in Washington. It also says Arizona’s average combined state and local sales tax rate is 8.52%, compared with 9.47% in Washington. On a $5 million home, the source gives a simple illustration of roughly $22,000 in annual property taxes in Arizona versus $37,500 in Washington using those statewide average effective rates. That gap gets attention.

• Lower property-tax rate
• Lower average sales-tax rate
• Lower annual carrying costs

This is where Arizona starts to feel practical. Not flashy. Just a place where the ongoing math can work better for wealthy households leaving Washington.

Redfin Showed A Big Price Gap Between Seattle & Phoenix

Housing value still matters at the high end. The source says Redfin showed a median sale price of $865,000 in Seattle versus $460,000 in Phoenix in March 2026. Luxury buyers do not shop at the median, of course, but the gap still helps frame the broader story. Arizona often gives buyers more square footage, newer housing stock, and lower carrying costs for the same outlay. In Greater Phoenix, that can also mean more choice in pedestrian friendly neighborhoods and newer luxury inventory that feels easier to justify on paper.

• Seattle median was $865,000
• Phoenix median was $460,000
• Arizona often stretches dollars further
• Greater Phoenix offers newer stock

That Redfin comparison lands because it’s simple. Wealthy Washington residents can often move capital into Arizona and feel like they’re getting more for it.

This Isn’t Really About Selling One House

A lot of people get this wrong. The source says Washington’s Department of Revenue states that the capital gains tax does not apply to the sale or exchange of real estate. It also says the millionaire-tax structure is built around Washington-taxable capital gains rather than exempt real-estate sales. So the pressure point is not just selling a luxury home in Washington. The pressure point is future income, investment income, business income, and estate planning. That’s a cleaner and more accurate message for affluent Washington homeowners looking at Arizona.

• Home sales aren’t the main issue
• Future income matters more
• Estate planning matters more

That changes the story in a useful way. Wealthy residents aren’t only reacting to one transaction. They’re reacting to a broader shift in Washington tax policy.

Why Arizona Keeps Coming Up For Wealthy Washingtonians

Greater Phoenix especially keeps showing up in this conversation because Arizona lines up with what affluent movers tend to want. The source says people relocate for reasons that include more home for the money and lower or more favorable taxes. The Arizona real estate market checks those boxes. It gives wealthy Washington residents lower income taxes, no state estate tax, lower effective property taxes, and a stronger housing value story than many West Coast markets. That combination is hard to ignore. And once Washington added a new millionaire tax, the Arizona case got a lot easier to make.

• Taxes look lighter
• Housing value looks stronger
• Wealth planning looks cleaner
• “The Valley” keeps drawing attention

This is why wealthy Washingtonians are relocating to Arizona. The state offers a simpler tax setup, lower carrying costs, and more room for capital to breathe. That message has teeth now, because Washington changed the rules.

Williams Luxury Homes does not provide legal or tax advice. Please consult an attorney or a CPA.