Child support in Idaho is calculated under a detailed set of court rules, the Idaho Child Support Guidelines, which are adopted by the Idaho Supreme Court as I.R.F.L.P. Rule 120. The result depends on both parents’ incomes, the parenting schedule, and costs such as health insurance and child care. Small details, like how self-employment income is counted or how many overnights each parent has, can change the number meaningfully. Holmes Law helps Idaho parents establish, calculate, modify and enforce child support in divorce cases, paternity cases and stand-alone support actions.
Holmes Law is a remote practice led by attorney Michael J. Holmes, with an Idaho mailing address in Meridian. Consultations and case work take place by phone, video and secure document exchange, so parents anywhere in the state can get help, from Ada and Canyon counties and Boise, Meridian and Nampa to Idaho Falls, Pocatello, Coeur d’Alene and Twin Falls. For an overview of all family law services offered in Idaho, see the Idaho family law page.
The Legal Basis for Child Support in Idaho
Idaho Code § 32-706 authorizes the court, in a divorce or child support proceeding, to order either or both parents to pay an amount reasonable or necessary for a child’s support and education, without regard to marital misconduct. The statute lists relevant factors, including the child’s financial resources, the resources, needs and obligations of both parents, the standard of living the child enjoyed during the marriage, the child’s physical, emotional and educational needs, and the availability of medical coverage at reasonable cost.
The Guidelines Presumption
Section 32-706(5) directs the Idaho Supreme Court to adopt guidelines and creates a rebuttable presumption that the amount produced by the guidelines is the correct amount of support. A court may depart from the guidelines only if applying them would be unjust or inappropriate in the particular case, and it must make a written or specific finding on the record explaining why. Those guidelines are I.R.F.L.P. 120.
Who Can Seek Support
A parent may seek child support as part of a divorce, in a paternity case, or in a separate action for support. The Idaho Department of Health and Welfare may also be involved, particularly when a family receives public assistance or asks the Department for enforcement services. Support for unmarried parents usually begins with establishing paternity; see the Idaho paternity page.
How Long Child Support Lasts
Under § 32-706(1), support is ordinarily payable until the child turns 18. Section 32-706(2) allows the court, in its discretion, to continue support after 18 while the child is still in high school, until the child discontinues high school or reaches 19, whichever comes first. The Guidelines themselves state that support for education after high school is not available under the Guidelines, although parents may agree to more in a settlement.
When Support Ends Early or Changes
Support can also end or change because of emancipation, a change in custody, or a court-ordered modification. A support order does not stop automatically just because a child moves in with the paying parent; the order stays in effect until the court changes it. Idaho Code § 32-709 gives the court discretion to credit the paying parent for support when a child has lived with that parent for more than 120 days with the other parent’s knowledge and consent, but relying on that provision is no substitute for a prompt motion.
The Income Shares Model
Idaho uses an income shares approach. The idea is that a child should receive the share of parental income the child would have received if the family lived together. The court combines both parents’ Guidelines Income, applies the Guidelines schedule to find a basic support obligation for the number of children involved, and then divides that obligation between the parents in proportion to their incomes. In a typical case, the parent with less parenting time pays their share to the other parent, who is presumed to spend their own share directly on the child.
Minimum Support
The Guidelines state that support should rarely be set at zero. When the paying parent’s monthly income is below $800, the court should carefully review incomes and living expenses to avoid denying that parent the means for self-support at a subsistence level. There is a rebuttable presumption that the minimum support amount is at least $50 per month per child.
High-Income Families
When combined income exceeds the top of the Guidelines schedule, the Guidelines direct the court to consider additional factors, such as the child’s resources, the standard of living during the marriage, and the child’s particular needs, rather than simply extending the formula.
What Counts as Income
Rule 120 defines Guidelines Income as the parents’ gross income before taxes, plus certain employment benefits and potential income, less specific adjustments.
Gross Income
Gross income includes income from any source, such as salaries, wages, commissions, bonuses, dividends, pensions, interest, trust income, annuities, Social Security benefits, workers’ compensation, unemployment, disability benefits, alimony and veterans’ benefits. The Guidelines allow overtime or second-job income to be excluded only when several conditions are all met, such as the extra work not being a condition of employment and the parent already working full time.
Self-Employment and Business Income
For rents, royalties and income from a business, gross income is gross receipts minus ordinary and necessary expenses needed to carry on the business. Business owners’ expenses are often where disputes arise: personal expenses run through a business, depreciation, and retained earnings can all affect the number. Complete business records and tax returns are essential, and I.R.F.L.P. 401 requires both parties to exchange tax returns and income information for the prior three completed calendar years when support is at issue.
Potential Income
If a parent is voluntarily unemployed or underemployed, the court bases support on that parent’s gross potential income, looking at work history, qualifications, job opportunities and earnings levels in the community. Potential income is not assigned to a parent who is physically or mentally incapacitated, and incarceration may not be treated as voluntary unemployment. The court may also assign income to assets that have been placed where they do not produce income, or transferred to reduce earnings.
Adjustments for Other Children
When a natural or adopted child from another relationship lives in a parent’s home, the Guidelines allow a deduction from that parent’s gross income. Under § 32-706(5), in a modification proceeding, children of the parent requesting the modification who were born or adopted after the existing order was entered are not considered.
Shared Custody and Extended Visitation
The parenting schedule can change support significantly. Parenting time is measured by counting overnights over a calendar year.
The 25 Percent Threshold
When the child spends more than 25 percent of overnights in a year with each parent, the Guidelines apply a shared custody adjustment. The basic obligation is multiplied by 1.5 to reflect the higher total cost of maintaining two homes for the child, each parent’s share is calculated by income, and the results are offset based on the time the child spends with the other parent. When one parent has 25 percent or fewer of the overnights, the basic calculation applies without that adjustment.
Extended Visits
Where a parent has 25 percent or fewer overnights, the court may reduce support during extended visits of fourteen consecutive days or more. Because the overnight count drives these calculations, accurate records of the actual parenting schedule matter. For how parenting time is decided, see the Idaho child custody page.
Health Insurance, Medical Expenses and Child Care
The basic support amount does not cover everything. Rule 120 treats several significant costs separately.
Health Insurance and Medical Costs
For every support order, the court must consider health insurance for the child. Coverage should generally be provided by the parent who can obtain appropriate coverage through an employer at the lower cost. Premiums for the child and health care expenses not covered by insurance, including orthodontic, optical, dental, psychological and prescription costs, are shared between the parents in proportion to their incomes. Any claimed expense for a course of treatment that results in an out-of-pocket cost of over $500 to the other parent must be approved in advance, in writing, by both parents or by prior court order.
Work-Related Child Care
The court may order the parents to share reasonable work-related child care costs in proportion to their Guidelines Income. Child care expenses can be a large part of a family’s budget, so documenting them carefully is important.
Transportation and Tax Benefits
The court may also allocate transportation costs for parenting time, particularly when parents live far apart. The Guidelines direct the court to consider the actual tax benefit of claiming the child, and parents may agree how to share those benefits; otherwise the court decides.
Deviating From the Guidelines
The Guidelines amount is presumed correct, but it is not automatic. Under Rule 120, a court may depart from the Guidelines when evidence shows the calculated amount is inappropriate. The court must state the amount the Guidelines would produce and explain the circumstances justifying the departure. Special needs of a child, extraordinary expenses, or unusual financial circumstances can support a deviation, but the parent requesting one needs evidence rather than general arguments.
Building the Record for a Deviation
A deviation request succeeds or fails on evidence. Useful records include receipts and statements for the child’s special expenses, reports from doctors, therapists or schools describing the child’s needs, and documentation of either parent’s unusual financial obligations. The parent opposing a deviation should be ready with the same kind of proof. Because the court must explain any departure in its findings, clear evidence also makes an order less vulnerable to challenge later.
Temporary Support and Establishing an Order
While a divorce or custody case is pending, a parent may request temporary child support under I.R.F.L.P. 504. A request for temporary support must be supported by a completed Affidavit Verifying Income. Getting a temporary order in place early helps a household meet the child’s needs while the case proceeds.
Stipulated Support
Parents may agree on support, but the agreement should be supported by a Guidelines worksheet. If the agreed amount departs from the Guidelines, the court will need a basis for approving it. A well-documented agreement also reduces disputes later.
Enforcement of Child Support
Every Idaho support order notifies the paying parent that it will be enforced by income withholding under chapter 12 of Title 32, Idaho Code. Beyond wage withholding, Idaho provides several enforcement tools.
Idaho Child Support Services
The Idaho Department of Health and Welfare’s Child Support Services program can help locate parents, establish and enforce orders, and collect payments. Families receiving certain public assistance generally work with the Department, and other parents may apply for services.
License Suspension
Under Idaho Code Title 7, chapter 14, a parent who is delinquent in support may face suspension of licenses, including driver’s licenses, professional and occupational licenses, and recreational licenses such as hunting and fishing licenses. The statute defines a delinquency as support unpaid for at least ninety days or $2,000, whichever is less. Proceedings can be initiated by the Department or by the parent owed support.
Contempt and Money Judgments
A parent who willfully refuses to pay may be held in contempt, and unpaid support can be reduced to a money judgment. When the paying parent lives in another state, interstate enforcement is available under the Uniform Interstate Family Support Act, which generally allows the issuing state to keep continuing, exclusive jurisdiction to modify its order.
Modifying Child Support
Under Idaho Code § 32-709, support may be modified only as to installments accruing after a motion for modification is filed, and only upon a showing of a substantial and material change of circumstances. A change in the Guidelines amount can itself constitute such a change, and so can changes in income, custody, or health insurance. Because modification is not retroactive before the motion, a parent whose circumstances change should act promptly.
The 15 Percent Myth
It is widely repeated that Idaho requires a 15 percent change before support can be modified. That figure appears in the Department of Health and Welfare’s review process for cases it handles under Idaho Code § 32-1218, but it is not a filing threshold in the Guidelines. A private motion is governed by the substantial-and-material-change standard of § 32-709. The Idaho family law modifications page explains the process in more detail.
Frequently Asked Questions
How is child support calculated in Idaho?
Idaho uses the income shares model in I.R.F.L.P. 120. Both parents’ incomes are combined, a basic obligation is found from the Guidelines schedule, and it is divided in proportion to income, with adjustments for shared custody, health insurance, medical expenses and child care.
Does child support stop at 18 in Idaho?
Usually, but under § 32-706(2) the court may continue support while a child is still in high school, until the child leaves high school or turns 19, whichever comes first.
What if the other parent quits a job to avoid support?
If a parent is voluntarily unemployed or underemployed, the court can base support on potential income, considering work history, qualifications and job opportunities.
Does 50/50 custody mean no child support?
Not necessarily. When each parent has more than 25 percent of overnights, a shared custody adjustment applies, but a parent with higher income may still owe support.
Can support be changed retroactively?
Under § 32-709, modification applies only to installments accruing after the motion to modify is filed, so it is important to file promptly when circumstances change.
Who pays for braces and counseling?
Uninsured health care costs, including orthodontic and psychological expenses, are generally shared in proportion to income. A course of treatment costing the other parent over $500 must be approved in advance in writing or by court order.
Speak With an Idaho Child Support Attorney
Getting child support right at the start, and keeping it current as circumstances change, protects children and prevents costly disputes later. Holmes Law helps Idaho parents calculate support accurately, present income evidence clearly, request fair deviations when warranted, and enforce or modify orders. To discuss your situation with attorney Michael J. Holmes, contact Holmes Law. Consultations are available by phone or video anywhere in Idaho. You can also read about Idaho divorce and how support fits into the larger case.