Taxes for Lawn Mowing? My 19 year old son and full time college student received a 1099-misc from a lawn mowing job earning $4605. Is there a way to not pay taxes?

My 19 year old son and full time college student received a 1099-misc from a lawn mowing job earning $4605.  He also had another job that took taxes out and he received a w-2.  Is there any way to not have to pay taxes for the lawn mowing?