You have to declare your revenues, regardless of whether or not you were paid in the United States. Failure to do so could cause problems for you in the future if you plan on returning to the U.S. on a new visa.
Your tax return is due by April 15th of each year for the previous year’s income.
As a paid intern on a J-1 visa, you are required to pay some (but not all) of the same taxes U.S. citizens pay. Consult the IRS’s website for the most up-to-date federal and State income tax rates.
As an international exchange visitor, you will most probably be eligible to claim a refund for a portion of the taxes you have paid. Please note that UK citizens (and citizens of any country that does not have a tax treaty with the U.S.) are not eligible for Federal tax refunds. However, you can still get a partial refund of State and local taxes.
