In 2006, I was in India for first 3 months & then came to US on L1 with same employer. On my W2 only US income is mentioned. Do I need to pay US taxes for only US income or do I need to convert 3 months of indian salary(already taxed at India) to US dollars & add to my total US income ? If I have to again pay tax on that 3 months Indian salary, can I somehow request for its refund?