Filing a joint tax return should not increase or decrease a child support obligation.
No, you would not be responsible for his back taxes since you did not file jointly but the IRS can put a lien on anything he left you. As far as child support, you are not in any way responsible for that.
By filing for child support.
It can take up to six months to receive in order to allow for the filing of an Injured Spouse Form if the obligating parent is remarried and filing jointly.
no, go to child support enforcement.
Yes and yes, but he should be filing for a modification. see links
No. Child support is usually non-dischargeable.
Yes, the birth of another child may affect child support. A filing should be made to recalculate the support amount based on this change of circumstance. Added: In Delaware, for example, parents are given a 'credit' for other minor children they are supporting that are not part of the filing. So, while the right to support may not be affected, the amount of support may be. Generally, the older child's right to support is not diminished by the birth of subsequent children.
It can take up to 6 months to receive tax money if filing jointly or if filing single it can take up to 10 weeks
Yes; parents are jointly and severally liable for the support of their children.
no
Contact your State's child support agency about filing a lien.
No. Child support is not dischargeable in either federal or state bankruptcy.