One of the most frequent questions I receive from people is-Do I have to file a US tax return? In general, US citizens and green card holders are required to file US tax returns reporting their worldwide income if their income exceeds a certain threshold.  For example in tax year 2015 if you were single and under age 65 you would be required to file a return if your worldwide income exceeded $10,300.  Attached are pages 8-10 from the IRS instructions to form 1040 which detail the various filing thresholds for tax year 2015.  There are exceptions to this threshold- the most