Generally income for this work is reported on Schedule C. There is no need to actually have a 1099. Companies are not required to send one out if you earned less than $600 from them. So you do not need one,but as you evidently know you still need to report the income. Use your own records to figure out how much you earned in fees and bonuses, your reimbursements, your expenses etc for each msc you did work for.
@hksh1 wrote:
If I earned less than $600 so the mystery shopping company did not send me a 1099, which form do I use to report the income if I am using 1040 file income tax? Do I fill out the 1099 myself?