Wage garnishment law in Missouri

Missouri Wage Garnishment
The maximum amount that may be held from a person's weekly wages, after withholdings required by law, is the lesser of:
1. 25% of the wages,
2. 10%, if the person is head of a family and a Missouri resident, or
3. The amount by which the weekly earnings exceed thirty times the federal minimum hourly wage. Mo. Rev. Stat. ??525.030.

Child support garnishment may be subject to a higher percentage of deduction.

If you're already being garnished for child support, it's unlikely they will be able to take additional funds from you.

How do I know if I am qualified as head of family?

I'm assuming that, since you're paying child support, your kids don't live with you full time. It's unlikely you'd be considered head of the family in that case. If you're already being garnished for child support, however, it's unlikely they can take additional funds from you to pay another judgment.

I have my kids half of the time and I pay child support. I am the noncustodial parent. However I did claim the kids on my taxes with written approval of their mother.

If you're the non-custodial parent, I don't think you would be considered head of household.