Leaving the US is not enough to leave California's tax net. Here is what actually breaks it.

When you plan your move back to India, you think about the IRS. Almost nobody thinks about the state, and that is where a nasty surprise waits. In the US, your state runs its own income tax with its own rules, and those rules do not care about your green card or your federal filing. A state taxes you based on domicile, the place it decides is truly your home, and simply landing in India does not end it.

That matters because a handful of states are aggressive about holding on. If your last US home was in California, New York or New Jersey, the state can keep treating you as a resident, and taxing your worldwide income including your new Indian salary, until you have clearly and provably cut the cord. Handing back the green card settles the federal question. It does nothing, by itself, for the state.

The idea that traps people is domicile. Your domicile is the one place the law treats as your permanent home, and you keep it until you both abandon it and establish a new one somewhere else. The catch when you move abroad is that a sticky state can argue you never really established a new home, because you kept a foot in the old one.

What keeps that foot in the door: a house or apartment you still own or rent in the state, a state driver's licence, voter registration, a car registered there, state bank and brokerage accounts, a mailing address, even club memberships and where your family stays. Any of these lets the state say you always meant to come back.

California, New York and New Jersey are the best known for chasing former residents, with New Mexico, South Carolina and Virginia close behind. They will ask for evidence of both the move and the intent to leave for good. A returning NRI who keeps a California condo, a California licence and a California brokerage account, and files nothing to break residency, is exactly the profile these states audit.

California gives one relatively clean exit, and it is worth knowing because so many NRIs came through California tech and finance jobs. If you leave the state under an employment-related contract for at least 546 consecutive days, roughly eighteen months, California treats you as a nonresident for that period, even if you keep a home there.

It is not unconditional. The absence has to be employment-related, your return visits to California have to stay under a limit, and it does not apply if you have large investment income or if the move looks like it is mainly to dodge tax. But for someone posted or employed abroad on a real contract, the 546-day safe harbor is the cleanest way to step off California's resident rolls.

For everyone else, and for the other sticky states, there is no magic number. It comes down to domicile and the weight of your ties, which is the next part.

Breaking residency stops the state taxing your worldwide income, your Indian salary, your Indian interest. It does not stop the state taxing income that arises inside the state. If you keep a rental property in California, the rent and the eventual gain on selling it stay taxable in California as California-source income, whether or not you are a resident, and whether or not you live in India.

The same goes for a business you still hold in the state, or a partnership interest sourced there. So a returning NRI who keeps a US rental should expect a state nonresident return on that income for as long as they hold it, on top of the federal return. This is normal and manageable, but it means the state connection does not fully close until the state-source income does.

There is no single form that ends state residency. You break it by moving your whole life, on paper and in fact, and keeping the evidence. The more of these you do, the harder it is for a state to say you never left.

Give up the state home, or at least stop keeping it available for your own use. Surrender the state driver's licence and get one in India. Cancel the voter registration. Move bank and brokerage accounts, or at least change the address of record off the state. Register any car elsewhere. Update every address, employer, bank and the IRS, to India. File a final part-year resident state return for the year you leave, and a nonresident return after that only for state-source income. Keep a dated record of when you left and the ties you cut.

The theme is intent made visible. A state auditor two years later is looking for proof that you meant to leave for good. Every tie you kept is an argument against you; every one you cut, documented, is an argument for you.