What is the main consideration for taxation of income earned in another state while working in California?

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The main consideration for taxation of income earned in another state while working in California is the source of income. California taxes its residents on their worldwide income, which includes income earned in other states. However, non-residents who earn income while working in California will be taxed by California on that income. The concept of source of income is essential because it determines where the income is considered to be generated and thus subject to taxation.

For instance, if a person works in California but lives in another state, California may still tax the income earned during the time spent working there, as the work is deemed to have a source within California. This illustrates why understanding the source of income is critical in determining tax obligations.

Factors such as tax residency status, amount of deductions, or type of job may have relevance in some contexts, but they do not fundamentally dictate where the income is taxable. The key factor is whether the income is sourced from California or another state.