The Idaho child support worksheet
In every child support case, the court receives an Affidavit Verifying Income and a child support worksheet I.R.F.L.P. 120(h). The forms are published by the Idaho Supreme Court with the Rules of Family Law Procedure.
| Form | Used for |
|---|---|
| Form 5: Affidavit Verifying Income | Each parent’s annual income, deductions and Guidelines Income, sworn under penalty of perjury. |
| Form 6: Standard Child Support Worksheet | Primary custody: one parent has 25% or fewer of the overnights for all the children. |
| Form 7: Shared, Split, or Mixed Custody Worksheet | Every other arrangement. It works child by child, so it handles shared, split and mixed custody. |
Form 6, line by line
- Monthly Guidelines Income for each parent and combined (from Form 5).
- Each parent’s percentage share of the combined income.
- The basic child support obligation from the schedule.
- Each parent’s share of that obligation.
- Recommended base support: the non-custodial parent’s amount.
- Other costs: child care, health insurance premiums and the tax benefit, each as a plus or minus.
- The total amount to be ordered.
Form 7, in brief
Form 7 divides each parent’s share among the children, applies the 1.5 multiplier to shared and split-custody children, multiplies by the share of overnights with the other parent (entering 1 at 75% or more and 0 at 25% or less), and offsets the totals. The same other-cost lines follow.
Filling the forms
The full calculator fills the court’s own Forms 5, 6 and 7 with your numbers and lets you download them as one PDF. Blank forms are on the Idaho Supreme Court’s Rules of Family Law Procedure page.
Note: the current Form 5 still cites “I.R.F.L.P. 126”, the rule number before the 2021 renumbering, and has no separate lines for spousal maintenance in the current case or unordered support; those are reported with other child support and alimony.
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