Credits for Taxes Paid to Another State: Why Double Tax Can Still Happen

Two states taxed the same dollars.

Surely one of them has to give the money back.

Sometimes.

A resident credit is generally a statutory calculation, not a universal promise that every overlapping state tax will disappear.

Why two states can tax the same income

State A may tax you because you are its resident. State B may tax the income because it is sourced there.

State A may provide a credit, but can ask whether it is the same income, whether it is sourced to the other state under State A's rules, whether the other levy is a qualifying tax, and what limitation applies.

Source mismatches are the hidden problem

California's other-state-credit framework generally determines source using California sourcing principles.

New York similarly requires qualifying income to be sourced to and taxed by the other jurisdiction, with restrictions for intangible income.

The credit is usually limited

The credit can be limited by both the tax imposed elsewhere and the resident state's own tax attributable to the qualifying income.

Reciprocity is not the same as a resident credit

The New Jersey–Pennsylvania reciprocal agreement covers employee compensation, not every category of income such as gains from property.

What Wynne does—and does not—mean

Comptroller v. Wynne matters to the constitutional treatment of interstate income, but it is not a universal rule guaranteeing a dollar-for-dollar credit whenever two states tax the same income.

Washington adds a classification question

Washington calls its chapter 82.87 levy a capital-gains excise tax. Whether another state's resident credit applies must be tested under that state's statute rather than assumed from the label.

The PRISM principle

A resident credit is the end of the multi-state analysis, not the beginning.

First determine residence and source.