About this form

IR470 is the application for an administrative review of a child support formula assessment when one or more permitted grounds apply.

Filing and use

You can apply in myIR or use the paper form. Identify each ground, provide supporting evidence, and check the time limit for past child support years.

Related forms and guides

• Ground 5 worksheet (IR470A)
• Ground 11 worksheet (IR470B)
• Response by other party (IR471)
• Exemption review (IR472)

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