Resident Credit for Taxes Paid to Another State

Part of Nauma's complete guide to RSU Taxes When You Move States.

When a prior state sources a share of an equity vest to itself — as described in RSU State Sourcing and Nonresident Equity Taxation — the question that follows immediately is whether the new state of residence will also tax that same income, and if so, whether there's a way to avoid paying full tax twice on the identical dollars. In most cases involving two states that both have an income tax, the answer is a resident credit. This page covers how that credit works. The important limits on it are covered separately in When Double Taxation on Equity Compensation Isn't Actually Fixed by a Credit.

The General Mechanism

Most states with an income tax allow their own residents a credit for income tax paid to another state on income that both states are taxing. The credit is claimed on the resident state's return — not the nonresident state's return — and is generally capped at the lesser of the actual tax paid to the other state, or the amount the resident state itself would have charged on that same income. This cap matters: if the nonresident state's tax rate on the income was higher than the resident state's own rate, the credit typically does not refund the full difference — it only offsets up to what the resident state would have charged.

A Worked Example

Consider an employee who was granted RSUs while living in California, then relocated to New York partway through the vesting schedule and continued working from there through the remaining vest dates — making the employee a part-year New York resident for that tax year, not a full-year resident. This distinction matters directly: New York's resident credit (claimed on Form IT-112-R) is allowable only for the portion of tax that applies to income sourced to and taxed by another state while the taxpayer was actually a New York resident. Income earned during the pre-move period, while still a California resident and nonresident of New York, is reported to New York (if at all) as nonresident-source income on Form IT-203 and does not enter into the resident-credit calculation at all.

With that established, assume a specific tranche vests after the move — that is, during the New York resident portion of the year. California sources 35% of that tranche's value as California-source income (per the workday calculation described in the companion pages, which looks at the entire grant-to-vest period regardless of when New York residency began), and the employee owes California nonresident tax on that portion. Because this particular vest falls within the New York resident period, New York taxes 100% of the same tranche as ordinary income under its own resident-taxation rules. Without any relief mechanism, the employee would be taxed on 135% of this tranche's value across the two states combined.

New York's resident credit allows the employee to credit the California tax paid against the New York tax otherwise due on that same California-sourced portion — capped at what New York itself would have charged on that portion, and limited to the portion of income that falls within the New York resident period as described above. If California's effective rate on that income was lower than New York's, the credit offsets the New York liability dollar-for-dollar up to the California tax paid, and the employee still owes New York the difference between the two rates on that portion. If California's rate was higher, the credit is capped at New York's own rate, and no further offset is available for the excess California tax. These figures are illustrative only and do not reflect any specific taxpayer's situation. If, instead, a different tranche from the same grant had vested before the move to New York, that vest would fall entirely in the nonresident period and would not involve the New York resident credit calculation at all — it would be evaluated purely under California's rules and New York's separate nonresident-sourcing rules, if any applied.

What Counts as "Qualifying" Income for the Credit

The other state must have actually assessed a real tax liability on the income — not merely withheld an amount that was later fully refunded. A credit is generally not available for withholding alone if no actual liability was ultimately owed to the other state. The income also generally has to be income that the resident state itself is including in its own tax base; a credit doesn't apply to income the resident state wasn't going to tax in the first place.

Where the Credit Is Claimed — and a Common Point of Confusion

The credit is claimed on the resident state's return, as an offset against the resident state's own tax liability. It is not claimed on, and does not reduce, the nonresident state's own return — the nonresident return calculates and reports the liability owed to that state independently, using that state's own sourcing rules. Filing the nonresident return correctly first (or concurrently) is generally necessary to have an accurate "tax paid to another state" figure to claim as a credit on the resident return.

Dual Residency: A Special Case

It's possible to be considered a full resident of more than one state in the same tax year — for example, someone who is domiciled in one state but who also meets another state's separate statutory residency test (often based on days present and maintaining a home there). This is a materially different situation from the part-year-resident example above, and it comes with its own, stricter rule: a dual-resident's credit for tax paid to the other state generally requires that the other state also allows a reciprocal credit against its own tax for the resident tax paid to the first state. If the other state does not offer that reciprocal treatment, the credit can be reduced or denied entirely, leaving genuine unrelieved double taxation on the same income.

This is a particularly relevant risk for anyone moving between California and New York specifically, since California is known for aggressively contesting claims that a taxpayer has fully broken California residency — a taxpayer who believes they left California but is later determined by the FTB to still be a California resident (in addition to being a New York resident or statutory resident) can find themselves in exactly this dual-residency situation, with the availability of a full offsetting credit depending on the reciprocal-credit condition described above rather than being automatic.

What This Page Does Not Cover

This page describes the resident credit mechanism as it generally works — which assumes the new state of residence has its own income tax to credit against. If the new state of residence has no income tax at all — Texas, Washington, Florida, and similar states — there is no resident-state liability to apply a credit against, and this mechanism does not provide any relief for the prior state's sourced claim. See When Double Taxation on Equity Compensation Isn't Actually Fixed by a Credit for this scenario specifically, and for the other situations (such as convenience-of-the-employer-rule conflicts) where the credit doesn't fully resolve double taxation even between two income-tax states.

California Note

California's version of this mechanism is its Other State Tax Credit, available to California residents for tax paid to another state on income also taxed by California — the same general structure described above applies. For a household relocating into California with equity that was sourced to a prior state, this credit is the relevant mechanism to explore; for a household relocating out of California (the more common scenario for Nauma's audience), the more relevant question is usually whether the new state of residence offers a credit for the California tax that continues to apply to previously-earned, California-sourced equity — see Nonresident Equity Taxation for why that California claim can persist long after departure.

This article is for educational purposes only and does not constitute legal, tax, or financial advice. Resident credit rules, caps, and qualifying-income definitions vary by state and are subject to change. Always consult a qualified tax advisor before relying on a specific credit calculation, particularly when more than two states or a nonresident equity sourcing claim is involved.