Oregon Child Support Laws (2026): Guidelines & Calculator

Oregon calculates child support using the Income Shares Model, combining both parents' adjusted gross incomes to set a basic support obligation under OAR 137-050-0700. Each parent pays a proportional share based on their percentage of that combined income. Use the Oregon child support calculator below to estimate a guideline amount, or open the Oregon child support calculator to run figures on a full-page tool.

How to Apply for Child Support in Oregon

The Oregon Department of Justice, Division of Child Support (DCS) administers the state's child support program. DCS provides services including application assistance, parentage establishment, support order creation, enforcement, and collection.

To apply for child support services, parents have several options:

• Online: Create an account at the Oregon Child Support Customer Portal
• By Mail: Complete the Child Support Application (CSF 03 0574) and mail it to your local office
• In Person: Visit a Division of Child Support office in your area

A one-time $1 application fee is required. Parents who have never received TANF must also pay an annual $35 service fee, as required by federal regulation.

After you create an online account, a case manager will contact you and guide you through additional steps based on your family's needs. The Division may close your case if representatives cannot reach you after you submit an application.

For assistance, call 800-850-0228 or email childsupportcustomerservice@doj.state.or.us.

How Is Parentage Established in Oregon?

Under Oregon law, when a child is born to a married couple, the law presumes the spouse is the child's parent. This presumption also applies when a child is born within 300 days after a divorce, legal separation, annulment, or the death of a spouse (ORS 109.067).

Following the passage of SB 163 (2025), Oregon updated its parentage statutes to use gender-neutral terminology. References to "paternity" have been replaced with "parentage," and "putative father" has been replaced with "alleged genetic parent."

For unmarried parents, parentage can be established through:

• Voluntary Acknowledgment: Both parents sign a Voluntary Acknowledgment of Parentage form at the hospital after birth.
• Notarized Acknowledgment: Parents can sign the notarized version at any time for a $35 fee.
• Genetic Testing: Either parent can request genetic testing through the Division of Child Support. The program covers initial testing costs. If results show a combined relationship index of 99 or greater, the administrator may enter an order declaring parentage (ORS 25.550).
• Court Order: Either parent can petition the court for a parentage determination.

Establishing parentage matters because it:

• Grants the non-custodial parent the right to seek visitation or custody
• Establishes the child's inheritance rights
• Allows the custodial parent to seek birth cost reimbursement
• Enables support to be ordered from the date of the child's birth

Genetic test results are typically available within 15 to 30 days. A parent must pay child support even if they reside outside Oregon.

How Child Support Is Calculated in Oregon

Oregon uses the Income Shares Model to calculate child support. This model is based on the principle that children should receive the same proportion of parental income they would have received if the parents lived together. The guidelines are found in OAR 137-050-0700 through OAR 137-050-0765.

The calculation follows these steps:

1. Determine each parent's gross income. This includes wages, salaries, commissions, bonuses, self-employment income, and other earnings.
2. Calculate adjusted income. Certain deductions apply, such as support obligations for other children and union dues.
3. Combine both parents' adjusted incomes. The total determines the basic support obligation from a standardized schedule (OAR 137-050-0725).
4. Divide the obligation proportionally. Each parent pays a share based on their percentage of the combined income.
5. Apply the parenting time credit. Parents with at least 73 overnights per year (20% of total overnights) receive a credit that reduces their obligation (OAR 137-050-0730).
6. Apply the self-support reserve. The calculation must leave the paying parent enough income to meet basic needs. The self-support reserve is updated annually on July 1 based on the federal poverty guideline. The current rate is $1,522 per month (effective July 1, 2025); the updated rate for July 1, 2026 will reflect the 2026 federal poverty guideline (OAR 137-050-0745).

Minimum Support Obligation

Under OAR 137-050-0755, there is a rebuttable presumption that an obligated parent can pay at least $100 per month as child support. If the calculated support is less than $100, it will be increased to meet this minimum.

This presumption does not apply if the parent:

• Receives public benefits (SSI, TANF, or similar programs)
• Is incarcerated
• Is disabled
• Has exactly 182.5 annual average overnights with the child (equal parenting time)

Tools for Estimating Child Support

Oregon provides two primary methods for estimating child support:

Option 1: Online Calculator Use the Oregon Child Support Guidelines Calculator for an interactive estimate. For questions about the calculator, email ChildSupportCalculatorQuestions@doj.oregon.gov.

Option 2: Worksheet Method Download and complete the Child Support Worksheet (CSF 02 0910) along with the worksheet instructions.

To calculate parenting time credits, use Oregon's Parenting Time Calculator.

The resulting figure from calculators and worksheets is an estimate only. The actual amount ordered by the court or Division may differ based on the specific circumstances of your case. For a quick guideline estimate, open the Oregon child support calculator.

Parenting Time Credit

Oregon's parenting time credit is one of the most detailed in the nation. The credit applies when the non-custodial parent has at least 73 overnights per year (20% of total overnights). The credit percentage increases on a sliding scale as parenting time increases.

When determining overnights, the Division uses two consecutive years from the written parenting plan or court order. It adds the total overnights for each minor child and divides by the number of minor children to get an average.

These percentages are approximate. The actual credit uses a formula that combines logistic and linear functions to determine the precise reduction.

Deviation from Guidelines

The court or administrative law judge may deviate from the standard guidelines when circumstances warrant. Common reasons for deviation include:

• Involuntary financial hardship (such as involuntary unemployment or incarceration)
• Special or extraordinary needs of the child
• Extraordinary expenses incurred by either parent
• Significant income disparity between parents
• Children from other relationships

If one of these applies, ask an Oregon family lawyer in a free case evaluation whether to request a deviation from the guideline amount (attorney advertising).

How to Modify Child Support in Oregon

Oregon allows parents to request a review and modification of their child support order 35 months after the order was established or last reviewed (OAR 137-055-3420). You may request modification sooner if there has been a substantial and continuing change in circumstances.

A change is considered "substantial" when the difference between the existing order and the recalculated amount exceeds $50 or 15% of the current guideline amount, whichever is less (OAR 137-055-3430).

Valid grounds for early modification include:

• Involuntary job loss or significant income change
• Change in the number of children receiving support
• Change in the needs of the child
• Change in physical custody arrangements
• Disability of either parent or child
• Incarceration (see ORS 25.247 for rebuttable presumption provisions)

How to request modification:

1. Download the Request for Review packet (CSF 01 0142A)
2. Complete the Uniform Income and Expense Statement (CSF 01 0100)
3. Submit both forms to the Division of Child Support

The Division will notify the other parent after reviewing your petition. The modification must be completed within 180 days of the written request. Depending on the case, the court may schedule a hearing or approve the petition if both parties agree.

Note that at least 60 days must have passed since the existing support order was entered before you can request a change-of-circumstance modification.

For modification assistance, call 800-850-0228.

Enforcement of Child Support in Oregon

Failure to pay child support in Oregon can result in serious enforcement actions. The Division of Child Support has multiple tools to collect unpaid support:

• Income Withholding: Automatic deduction from wages, salary, and other income sources
• Tax Refund Interception: State and federal tax refunds can be intercepted
• Property Liens: Liens can be placed on real and personal property, preventing sale until arrears are paid
• Bank Account Levy: Funds can be garnished from bank accounts
• License Suspension: Driver's, professional, and recreational licenses may be suspended under ORS 25.750
• Passport Denial: Federal law allows passport denial for arrears over $2,500
• Credit Bureau Reporting: Past-due support is reported to credit bureaus
• Lottery Winnings Intercept: Lottery prizes can be seized
• Personal Injury Settlement Garnishment

You can prevent most enforcement actions by staying current on payments or requesting a modification if your circumstances have changed.

Criminal Nonsupport in Oregon

ORS 163.555 defines criminal nonsupport as knowingly failing to provide support for a child under 18 when legally obligated to do so.

Criminal nonsupport is a Class C felony in Oregon. Penalties include:

• Up to 5 years in prison
• Fines up to $125,000
• Both imprisonment and fines in serious cases

It is an affirmative defense that the parent had a lawful excuse for failing to provide support. The court generally views incarceration as a last resort because it reduces the parent's ability to earn income and pay support.

When Does Child Support End in Oregon?

Under Oregon law, child support typically ends when the child turns 18 years old. However, support may continue until age 21 if the child qualifies as a "child attending school" under ORS 107.108.

To qualify as a child attending school, the child must:

• Be between ages 18 and 21
• Be enrolled in school at least half-time
• Maintain satisfactory academic progress, as defined by the school the child attends
• Submit compliance documents within 30 days from the start of each term
• Not be married or in a registered domestic partnership
• Not be emancipated

The child must also notify the Division and the paying parent of their intent to attend school. More information is available on the Oregon DOJ Support for Students Ages 18-21 page.

Support may continue indefinitely if the child is physically or mentally disabled and unable to support themselves.

Termination of Parental Rights

In Oregon, a parent may only voluntarily terminate parental rights when another person is prepared to adopt the child. Termination of parental rights does not eliminate existing child support debt. The statute of limitations on collecting child support arrears is 10 years after the last payment was due.

Emancipation

Oregon allows minors at least 16 years old to petition for emancipation. Requirements include parental consent, financial independence, and demonstrating the ability to manage without parental assistance. Consult with a family court attorney to determine eligibility.

2025 and 2026 Legislative Updates

Recent legislation has brought notable changes to Oregon's child support program:

HB 3348 (2025), effective January 1, 2026, makes changes to child support program administration. Key provisions include allowing certain notices, orders, and legal documents to be delivered by email rather than first-class mail. The Oregon Child Support Program also reassigned many case-management offices effective October 6, 2025.

SB 163 (2025) modernized Oregon's parentage statutes by adopting gender-neutral terminology. The bill replaced references to "paternity" with "parentage," "putative father" with "alleged genetic parent," and "blood test evidence" with "genetic testing." These changes incorporate provisions from the Uniform Parentage Act.

The self-support reserve updates annually on July 1 to reflect the current federal poverty guideline. The July 2025 rate is $1,522 per month (OAR 137-050-0745).

More Oregon Laws

• Oregon Alimony Laws
• Oregon Child Custody Laws
• Oregon Divorce Laws

Frequently Asked Questions

How is child support calculated in Oregon?

Oregon uses the Income Shares Model. Both parents' adjusted gross incomes are combined to determine a basic support obligation from a standardized schedule. Each parent then pays a proportional share based on their percentage of the combined income. Parents with at least 73 overnights per year receive a parenting time credit that reduces their obligation.

What is the minimum child support payment in Oregon?

Oregon has a rebuttable presumption that every obligated parent can pay at least $100 per month in child support. This minimum does not apply if the parent receives public benefits (SSI or TANF), is incarcerated, is disabled, or has exactly equal parenting time (182.5 overnights per year).

When can I modify a child support order in Oregon?

You can request a routine review after 35 months from when the order was established or last reviewed. You may request an earlier modification if there has been a substantial change in circumstances, such as job loss, a change in custody, or disability. At least 60 days must have passed since the current order was entered.

At what age does child support end in Oregon?

Child support typically ends when the child turns 18. However, support may continue until age 21 if the child qualifies as a child attending school by being enrolled at least half-time and maintaining satisfactory academic progress. Support may continue indefinitely for a child with a physical or mental disability.

What happens if you do not pay child support in Oregon?

Oregon can enforce unpaid child support through income withholding, tax refund interception, property liens, bank account levies, license suspension, passport denial, and credit bureau reporting. Criminal nonsupport under ORS 163.555 is a Class C felony, carrying up to 5 years in prison and fines up to $125,000.