I work as a "freelance" artist as well. Or at least I call myself as such too, but MikeLawson bring up a very good point... According to the law, an individual is an independent contractor if the payer has the right to control or direct only the result of the work and not what will be done and how it will be done. You are not an independent contractor if you perform services that can be controlled by an employer (what will be done and how it will be done). So make sure one or the other applies to you... You charge more as freelancer or you are an employee and the reason they gave doesn't apply to you.
I work as a freelancer but at the location, being directed so I should not qualify as independent contractors. I am getting payed no benefits but have taxes deducted out of my paycheck... I have to always be on lookout for jobs, the most a project will go is 6 months. It's a very murky and frustrating game.
He that would make his own liberty secure, must guard even his enemy from oppression.
Frontline: The Untouchables
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