Chapter 13: State taxes and moving

California's top income tax rate is over 13%. Texas charges nothing on income. Multiply that gap by Maya's $340,000 and you get the brochure version of moving: $44,200 a year, every year, just for changing an address. The real number is smaller, the move is harder to prove than people expect, and the state being left behind employs auditors who specialize in disbelief. This chapter covers the layer most tax guides skip entirely: how states tax, what it actually takes to leave one, and how to model a move honestly.

The third layer

Everything in this playbook so far has been federal. Most Americans also pay an income tax to their state, and the state systems come in three shapes.

• Progressive states run staircases of their own, with brackets stacked on top of the federal ones. California's staircase is the steepest, topping out above 13%.
• Flat states charge a single rate on taxable income, from the first dollar to the last.
• No-tax states charge nothing on wages. There are nine: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. One asterisk belongs on that list: Washington taxes large capital gains even though it leaves wages alone, so investors should read the fine print before counting it.

Most states begin their math at your federal AGI and then apply their own adjustments, which is why the state return rides along after the federal one. Past that starting point they disagree about nearly everything: some exempt retirement income or Social Security, some give 529 deductions (Chapter 7), and rates change often enough that this guide quotes no state numbers beyond the two safe ones above. Your state's revenue department publishes the current table.

The total bill, not the income-tax line

States without income taxes still pave roads and run schools, so the money comes from somewhere else. Texas leans on property taxes, which run among the highest rates in the country. Tennessee leans on sales tax. Alaska leans on oil. The honest comparison between two states adds up your whole bill in each place for the life you would actually live there: income tax, plus property tax on the house you would buy, plus sales tax on what you spend.

A pattern falls out of that arithmetic. A high earner renting a modest apartment keeps most of the brochure savings, because income tax really is most of their state bill. A family buying a large house keeps much less, because the property-tax line grows as the income-tax line shrinks. Run both columns before believing anyone's headline.

Domicile, residency, and the 183-day myth

Domicile is your one true home in the eyes of tax law, the place you intend to return to when you are done traveling. You have exactly one. You keep it until you both establish a new one and abandon the old one, and no single document flips it. States judge domicile on facts and circumstances: where your house is and how big it is, where your spouse and kids live, where your doctor, dentist, and gym are, where you vote, hold a license, and register cars, where the holidays happen, where the dog and the family photos live. Auditors read calendars, credit card statements, and cell-phone location records, and they are good at it.

Statutory residency is a separate trap. Even if your domicile genuinely sits elsewhere, most states will tax you as a full resident for any year in which you kept a place to live there and spent more than half the year, commonly 183 days, inside the state.

Put those two rules together and the most repeated sentence in relocation forums collapses. Keeping your days in the old state under 183 is necessary, because blowing the count makes you a resident all by itself. It is nowhere near sufficient, because your domicile, and the full tax bill that follows it, stays put until the life around it moves: the home, the family, the paperwork, the patterns. People have "moved" to Florida through years of careful day-counting and lost anyway, because the bigger house, the spouse, and the cardiologist never left the old state.

And the old state checks. High-tax states audit the exit years of high earners as a matter of routine, the burden of proof in a domicile fight rests largely on you, and the letter usually arrives a year or two after the move. Treat the moving year as a year you are assembling a court-ready file: closing documents and leases, utility starts and stops, license and voter registration dates, school enrollments, and a day-count log with boarding passes behind it.

Remote work and the convenience rule

Work in one state for an employer in another and two rules decide who gets paid. The default is physical presence: you owe tax to the state where your body does the work, and your home state, which taxes all your income, gives you a credit for taxes paid to other states, capped at what it would have charged on that same income. The credit means you generally end up paying about the higher of the two states' rates on that income, never both in full.

The exception is the convenience of the employer rule, and New York enforces the famous version. If your job is based in a convenience-rule state, days you choose to work from home in another state still count as workdays in the employer's state; only days the employer requires you to be elsewhere escape. A remote employee living in another state but attached to a New York office can owe New York tax on a full year of home-office days, and when the home state disputes the credit, some income genuinely gets taxed twice. Before accepting a cross-state remote arrangement, ask payroll which state they will withhold for and under which rule. A CPA earns their fee here.

Windfall years: sequence before signatures

States tax the income that lands while you are their resident, which makes the order of a big year matter enormously. Sell a business in March and move in May, and the old state taxes the entire gain, because you were its resident on the day the money arrived. Make the move real first, then sell, and the gain belongs to the new state, which may want nothing. The same sequencing covers large Roth conversions and gain harvesting: the state you live in when the income happens is the state that taxes it.

Income you already earned, though, does not forget where it was earned, and equity compensation is the big example. RSUs get apportioned: when a grant vests, states like California source the income by counting workdays between grant and vest. Take a grant made in January 2026 that vests in January 2028, with a move to Texas in January 2027. Half of the grant-to-vest period was worked in California, so California taxes half of that vest at its rates, even though the shares land on a Texan, and the W-2 will say so. The trail fades as post-move grants replace pre-move ones, but that takes years, not weeks. Chapter 10 covers the federal side of the same vests.

The SALT echo on your federal return

Moving also edits your federal return. Through 2029, itemizers deduct state income and property taxes up to the cap from Chapter 2, $40,400 in 2026, as long as MAGI stays under $500,000. Inside that cap, every dollar of state tax was saving a 35%-bracket itemizer up to 35 cents of federal tax. Erase the state income tax and the federal subsidy disappears with it; at the full cap the echo can be worth up to about $14,000 a year (35% of $40,400). After the cap reverts to $10,000 in 2030, the echo shrinks and a no-tax state's edge widens again. Honest modeling carries both eras.

Maya's model, honestly

After the honest pass, the savings are still five figures a year once the trailing vests run out. That is real money. In the early years, though, it lands closer to half the brochure than to all of it, and Maya prices the decision the way Chapter 1 taught: on after-tax, after-fee, after-hassle dollars, going only if she wants the Texas life at that honest price. A move made for taxes alone is the tax tail wagging an entire household.

Where people go wrong

• Counting days while the life stays behind. Under 183 days in the old state is necessary, and domicile still never moved: the house, the spouse, the doctors all testify against you.
• Selling first, moving second. The state you live in on the day a gain lands is the state that taxes it. Sequence matters more than the size of the truck.
• Comparing a top rate to zero. Effective rates, property taxes, and sales taxes belong in the model; brochures skip all three.
• Forgetting trailing RSU income. Pre-move grants keep generating old-state tax at each vest, and the surprise often arrives via an unexpected state W-2.
• Remote workers assuming the home state is the whole story. A convenience-rule employer state can claim your home-office days, and the credit does not always make you whole.

Key takeaways

• States tax income three ways: progressive staircases, flat rates, or nothing on wages in the no-tax nine, with property and sales taxes clawing back part of the difference everywhere.
• Domicile is a facts-and-circumstances test, and 183 days is a floor you must clear, never a finish line that decides the race.
• High-tax states audit exit years; the moving-year file (closings, registrations, day logs, boarding passes) is your defense.
• Remote workers owe tax where they work, claim credits at home, and should check for convenience-of-the-employer states before signing.
• Sequence windfalls after a real move, expect RSUs to be apportioned to the old state for years, and remember the SALT cap means cutting state tax also cuts a federal deduction.
• Maya's honest CA-to-TX model saves real five-figure money, but early on it is closer to half the $44,200 brochure number.

Sources: IRS: One Big Beautiful Bill Provisions · IRS: 2026 Tax Inflation Adjustments · Finvest Personal Finance Guide · Residency and domicile guidance from state revenue departments, including the California Franchise Tax Board and the New York Department of Taxation and Finance