I believe all States have provisions for retroactive support.
Yes, but not retroactive.
Probably not. Retroactive child support is typically awarded (or not) in the original (first) order of support.
No. In some states they may enforce retroactive support or support for while the "child" attends a 4 year university. Retroactive support is generally only backdated 2 years from notice.
No, but he can be fined and jailed.
Often, the issues arises about the payment of spousal support for the period of time between the date of separation and the signing of the separation agreement or a court order. This is called retroactive spousal support. more info: http://www.freecanadiandivorcelegalinfo.com/?page_id=44
This assumes that you're asking about retroactive support (support due for a period prior to the entry of the first order), not unpaid support that accrued as the result of an order. Retroactive support is typically awarded (or not) at the entry of the original order for ongoing support. At that time, the court should give the obligor credit for voluntary support furnished during the period covered by the retroactive support award.
SSI recipients are not ordinarily ordered to pay support.
Retroactive up to 18 years. see link
In theory, the court can order retroactive support to the birth of the child. However, many judges will not order support for a period prior to the obligor's awareness of the child.
Yes, if you had custody of the child during the period for which you are seeking retroactive support.
Sue him for retroactive child support.
Retroactive support is generally awarded or denied when the original support order is entered.