I don't understand why they want a W-9 form. All they actually need is your SS# so that they can issue a Form 1099 reflecting your income for the year. There is no requirement of $600 before a Form 1099 can be issued. Banks will issue Form 1099 reflecting interest of $10.
Our responsibility to report all income earned is in accordance with IRC Sec 61A unless there is an allowable deduction. The requirement to file a return is based on Income. People who have part-time employment and earn less than $600 don't have to file, but should file Form 1040 EZ in order to get any taxes witheld returned/refunded. Microstock income for many contributors is in addition to some other form of employment and would be subject to the Fed Income tax Law if they are an American citizen .
Citizens of other countries if subject to U.S. Fed tax laws will be able to reduce the subject tax by the amount of Foreign Tax paid as a Foreign Tax Credit.
This is of course just a general guideline.
Hope you do better than $600!
