How to Use the Oregon Child Support Calculator
Enter what you know and press Calculate Estimate. The calculator follows the Oregon child support guidelines (OAR 137-050-0700 to 137-050-0765) and the steps of the Oregon DOJ child support worksheet. We checked its results against the official Oregon worksheet workbook.
- Enter each parent's gross monthly income as Parent A and Parent B.
- Choose the number of joint children (up to 10) and the parent with primary physical custody.
- Enter the average overnights a year the children spend with the other parent, from the current parenting time order or written agreement.
- Add monthly work-related child care and the children's health insurance premium (only the part for these children), and say which parent pays them.
Your numbers are sent with the form, not placed in the page address, and this site does not store them. This is a planning estimate. An Oregon court or the Child Support Program decides the actual amount.
Oregon Child Support Changes for 2026
Looking for new child support rules in Oregon for 2026? The latest change is the self-support reserve, which is $1,729 a month effective July 1, 2026 (OAR 137-050-0745). It equals the federal poverty guideline for one person times 1.303 and is updated every year.
The obligation scale itself has not changed: it still runs to $30,000 of combined adjusted income and up to ten children. The parenting time credit formula has applied since July 1, 2013. Oregon DOJ published review papers in late 2024, including one on the parenting time credit, but we found no newly adopted scale or credit formula as of October 2026. This page will be updated if the rules change.
A change in the guidelines does not automatically change an existing order. A parent generally has to ask for a modification.
How Oregon Calculates Child Support
Oregon uses an income shares model based on gross income. The worksheet steps in OAR 137-050-0710 are:
- Adjusted income: gross income, minus union dues, the parent's own health insurance premium and spousal support paid, plus spousal support received, minus a deduction for non-joint children. Each parent's share of the combined total is their income share.
- Income available for support: adjusted income minus the $1,729 self-support reserve.
- Basic support obligation: from the obligation scale, split by income share, but no more than each parent's available income.
- Child care and health care coverage: shared by income, within the limits in the rules.
- Credits: each parent gets a parenting time credit for their own overnights and a credit for child care and insurance they pay.
- Who pays: only the parent with the greater net obligation pays cash child support, rounded to the nearest dollar, with a $100 minimum order.
The guideline amount is presumed correct. It can be rebutted with findings that it is unjust or inappropriate (OAR 137-050-0760).
The Oregon Obligation Scale
The scale runs in $50 brackets of combined adjusted monthly income, from $0-$1,000 (which is $50) to $30,000, for one to ten children. When income falls between two amounts, the lower one is used. Sample lines:
| Combined adjusted monthly income | One child | Two children | Three children |
|---|
| $2,000 | $391 | $568 | $671 |
| $3,000 | $558 | $808 | $951 |
| $4,000 | $699 | $1,011 | $1,189 |
| $5,000 | $788 | $1,136 | $1,333 |
| $6,000 | $858 | $1,234 | $1,446 |
| $8,000 | $954 | $1,363 | $1,585 |
| $10,000 | $1,082 | $1,542 | $1,789 |
| $15,000 | $1,337 | $1,899 | $2,196 |
| $20,000 | $1,587 | $2,249 | $2,596 |
| $30,000 | $1,987 | $2,801 | $3,217 |
Above $30,000 a month the $30,000 amount is used, and above ten children the ten-children amount is used. The basic obligation includes $250 per child a year for ordinary medical costs.
The Oregon Parenting Time Credit
Every parent gets a credit for their own overnights. The credit percentage comes from a formula in OAR 137-050-0730 (or the table in that rule), and the credit equals the basic support obligation times that percentage. Sample values:
| Overnights a year | Parenting time credit |
|---|
| 0 | 0.00% |
| 36 | 3.19% |
| 73 | 8.87% |
| 100 | 15.37% |
| 121 | 22.17% |
| 146 | 32.32% |
| 182 | 49.75% |
| 183 | 50.25% |
| 219 | 67.68% |
| 292 | 91.13% |
| 365 | 100.00% |
Overnights are averaged over two consecutive years using the current written parenting time agreement or court order. Without one, the parent with primary physical custody is treated as having all the parenting time. Blocks of 12 continuous hours can count as a day.
Child Care and Health Care Coverage
Child care counts for children under 13 (or disabled) when it is needed for work, a job search or education. Only actual out-of-pocket costs count, not subsidized amounts. The maximum allowed per child is:
| Age of child | Portland, Bend, Eugene, Corvallis and other listed metro areas | Other locations |
|---|
| Newborn to 1 year | $1,705 | $1,190 |
| 1 to 3 years | $1,705 | $1,083 |
| 3 to 6 years | $1,400 | $860 |
| 6 years and older | $1,100 | $629 |
Health care coverage is reasonable in cost if it is no more than 4% of the parents' adjusted incomes combined. A parent earning no more than the highest Oregon minimum wage has no reasonable-cost share. The cost is split by each parent's share of that reasonable-cost limit, and the parent who pays the premium gets credit for it. If no coverage is available, cash medical support may be ordered.
Oregon Child Support Examples
In each example the children live mostly with Parent B. Amounts are monthly and come from this calculator, which matched the official Oregon worksheet in each case.
Example 1: One child
A earns $5,000 and B earns $3,000. The scale amount for $8,000 is $954 and A's 62.5% share is $596.25. A pays $596 a month.
Example 2: Two children with child care
A earns $6,000, B earns $4,000, and B pays $500 a month for child care. A's share of the $1,542 base is $925.20, plus 60% of child care ($300). A pays $1,225 a month.
Example 3: 100 overnights with A
Same incomes, two children, no child care. A's credit for 100 overnights is 15.37% of $1,542 = $237.01, and B's credit for 265 overnights covers more than B's share. A pays $688 a month.
Example 4: Equal time
A earns $7,000 and B earns $3,000, one child, 182 overnights with A. A's share is $757.40 minus a $538.30 credit. A pays $219 a month.
Example 5: Low-income paying parent
A earns $1,500 and B earns $4,000, one child. A's income is below the $1,729 self-support reserve, so A's share is $0, but the minimum order applies: A pays $100 a month.
Example 6: Insurance paid by the payer
A earns $5,000 and B earns $3,000, one child, and A pays a $150 premium for the child. A pays $540 a month.
These are illustrations produced from the rules, not court rulings.
What Counts as Income in Oregon
Income under OAR 137-050-0715 includes wages, commissions, bonuses, recurring overtime, severance, pensions, dividends, interest, rent, and Social Security, workers' compensation, unemployment, disability and VA disability benefits. Self-employment income is gross receipts minus the cost of goods sold and ordinary and necessary business expenses.
Excluded are child support received, SNAP, Social Security or VA benefits paid for the child, adoption and guardianship assistance, and foster care payments. Potential income can be used for a parent earning less than they could, and full-time minimum wage is used when there is not enough information.
Frequently Asked Questions About Oregon Child Support
Is this the official Oregon child support calculator?
No. ChildSupportCalculator.xyz is an independent tool and is not affiliated with the State of Oregon, its courts or the Oregon Child Support Program. It follows OAR 137-050 and was checked against the official worksheet. A court or the Child Support Program sets the actual amount.
How is child support calculated in Oregon?
Both parents' adjusted incomes are added, the basic obligation comes from the obligation scale and is split by income share, child care and health coverage are added, and each parent gets credits for parenting time and costs they pay. The parent with the greater net obligation pays the difference.
What changed in Oregon child support in 2026?
The self-support reserve became $1,729 a month on July 1, 2026. The obligation scale and the parenting time credit formula did not change.
Does Oregon use gross or net income?
Gross income, adjusted for union dues, the parent's own health insurance premium, spousal support and non-joint children.
How do overnights affect child support in Oregon?
Each parent gets a parenting time credit for their own overnights, from 0% at no overnights to about 49.75% at 182 and 100% at 365. Even a few overnights give some credit.
Who pays child support with 50/50 custody in Oregon?
With equal time, the parent with the higher income usually still pays, because their share of the basic obligation is larger. Child care and insurance costs can change the result.
What is the minimum child support in Oregon?
A parent is presumed able to pay at least $100 a month in total support, unless an exception applies, such as exactly equal parenting time, disability benefits or public assistance as the only income, or incarceration.
What is the self-support reserve in Oregon?
$1,729 a month from July 1, 2026. A parent's total support obligation may not exceed their adjusted income minus this amount, except for the minimum order.
What if our income is above $30,000 a month?
The scale amount for $30,000 is used. A party can ask for a rebuttal if the result is unjust or inappropriate.
Does the Oregon calculator need my personal details or a login?
No. This site needs no login and does not store your numbers.
