A child support agency cannot modify a court order.
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You should contact the court or child support enforcement agency and request a date change.
Paternity must be established before child support is awarded. Therefore, it would be unlikely that "legitimation" would change the amount of that support.
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It changes only if the order for support specifically provides for such change.
A debt collection agency will add fees and interest so the numbers will change as time goes by.
Yes. Your earnings might change the amount of support you are ordered to pay.
Such a move will not change the amount of support owed. Illinois will likely ask Tennessee to register the support order.
If the payments are being made via a state agency (DCFS, CSE, etc.) contact that agency and explain to them what is needed. This applies to a garnishment order also, the agency will contact the employer with the new information.
Because your child support is court ordered. To change it, you have to go back to court and present reasons for the change.