Yes, it is correct to populate your MA return based on your W-2s.
Massachusetts taxed remote employees who originally worked in MA but worked out of state due to the coronavirus pandemic.
That rule ended on September 13 and MA stopped taxing remote workers.
Your first paycheck after the rule changed was probably September 27, which is why your employer started withholding D.C. tax from that point.
All income until September 13 is Massachusetts Income While Nonresident. I’m assuming the difference with September 27 is that the income was earned up to September 13 and paid on September 27.
Updated FAQs available on non-resident telecommuting and 830 CMR 62.5A.3: Massachusetts Source Income of Non-Residents Telecommuting due to the COVID-19 Pand...
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