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In Mississippi, child support is paid until a child becomes emancipated. In Mississippi, the age of emancipation is twenty-one (21). Earlier emancipation may be determined by a judge if the child marries, joins the military on a full-time basis, discontinues full-time enrollment in school and is over 18, obtains other full time employment or establishes residency outside the custodial parent's home, is incarcerated dueto a felony conviction, or cohabits with another person without the approval of the parent obligated to pay child support.
You can petition the court for a modification of your child support obligation based on a reduction in income since the original order. I would recommend seeing a Mississippi attorney in order to determine if you would qualify for a reduction in child support payments.