How to Modify Child Support in Idaho: Filing Steps and Effective Date

By the FigureMyTax Editorial Team · How we calculate

To modify Idaho child support, file a motion to modify and serve the other parent. Only installments accruing after the motion can change, so file as soon as your circumstances change.

How do you modify child support in Idaho?

1. Run the guideline amount in the Idaho child support calculator and see the gap in the modification calculator.
2. File a motion to modify in the court that issued the order. Only installments accruing after the motion can change (Idaho Code 32-709(1)), so the filing date matters.
3. Serve the other parent and provide the income affidavit and worksheet the Guidelines require.
4. Prove the change. You must show a substantial and material change of circumstances; a change in the amount under the Guidelines may be one (Rule 126(d)).
5. Keep paying the existing order until the court changes it.

Can the parents agree to an Idaho change?

An agreed modification is possible, but the court still approves it and a departure from the Guidelines needs a finding that applying them would be unjust or inappropriate (32-706(5)). Ask the court assistance office for the agreed modification forms for your county.

What if the children lived with the paying parent in Idaho?

The court may allow a credit against child support arrearages for periods exceeding 120 days during which the minor children lived primarily with the obligated parent with the knowledge and consent of the custodial parent (32-709(2)). Gather proof of where the children lived and of the other parent’s consent.

What about health insurance in an Idaho modification?

A support order may be changed to provide for health insurance that was not in it (Rule 126(d)). Health coverage is part of the support calculation, so ask for it in the motion.

How does withholding fit in?

All support orders must notify the obligor that income withholding will be enforced through a withholding order to the employer, without additional notice to the obligor (32-1204). A modification changes the amount withheld only after the court issues a new order.

Where do you find the forms?

The Idaho courts’ self-help site offers instructions for filing a modification and an agreed modification where the order was entered in Idaho, and the court assistance offices can help you find the forms for your county (Idaho court self-help Q&A). The Rule 126 income affidavit and child support worksheet are part of the Guidelines.

How much does a late filing cost? An example

If you file 3, 6 or 9 months after your change, the relief you lose at a $300 monthly difference is:

Can the court consider tax benefits?

Yes. When the court awards one parent the right to claim the child for tax benefits, the order need not list every benefit, and the parent awarded them attaches a copy of the order to the return (32-706(6)). Ask for that in the motion if the claim has changed.

What should you expect at the Idaho hearing?

The court will look at each parent’s income now, the guideline calculation and the evidence of the change, and it must make a written or specific finding if it departs from the guideline amount (32-706(5)). Bring the worksheet, the affidavit verifying income and proof of the date the other parent was served.

What happens to unpaid support while the motion is pending?

It stays owed. See how long Idaho arrears last and add up your balance.

Frequently asked questions

Official sources

• Idaho Code 32-709: modification of support
• Idaho Code 32-706: child support; guidelines presumption
• Idaho Rules of Family Law Procedure, Rule 126: Idaho Child Support Guidelines
• Idaho Code 32-1204: income withholding
• 42 U.S.C. 666(a)(9): no retroactive modification of support already due

This is general information, not legal advice. It is based on the cited Idaho statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Idaho attorney.