“Can the Oklahoma Child Support Services levy or garnish my business bank account for back child support.  If not, what’s my best defense without a lawyer?”

The Court will consider all of your personal assets and apply the statutory calculations to come to a fair amount for your child support payment.  It sounds like you are thinking about hiding your assets by leaving part of your salary in your business account to lower your future support payments.  That is not a good idea.  Your only defense without an attorney is a negative paternity test.  Otherwise, the court will focus on the child’s best interests and find a fair number considering both your financial situation and the mother’s financial situation.  Contact a family law attorney in your jurisdiction to discuss your concerns.  This will likely help you achieve the best
possible outcome in this situation.