As MA resident, you pay taxes on all your income. However, as Massachusetts resident who work and pay income taxes in other states you are generally entitled to a credit against your Massachusetts income taxes in an amount equal to the tax paid to the other state.
You need to file Non-resident CA and GA returns and MA resident return. To ensure accurate calculations, always complete the nonresident returns first.
For more information, check: How do I file a nonresident state return?
mass.gov
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