My child is age 17 and received a 1099-MISC for 2020. It has $808.88 in box 3. This was from a 4H project. She had expenses of $629. Does she need to file a tax return. This is her only income.
No since her total unearned income for the year is less than the $1,100 filing requirement.
EDITED: If this was for the sale of a project animal then is is earned income an the filing requirement is more then $12,400.
Also note that in the future he has a higher income that does require filing then the taxable income from a 4-H or FFA project can be reduced by expenses, cost of animal, feed, shoe]w supplies, etc.
See IRS Pub 225
@0512 above answer edited to add information.