Which income category do I fall into?

40 year old male. I only have about $9000 in my bank account. Drive a Honda SUV. Income, depends on the gig because I have my own office.

Am I a low income, middle class or high class?
Added (1). I'm getting $3000-$4000 a month without any benefits like health insurance or dentals.
Added (2). I live in North California.

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