Oregon uses the Income Shares model — both parents’ gross incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and Oregon child support laws.
BothParents Income
NoneIncome Cap
18Age Support Ends
9%Arrears Interest
🌲 Oregon Income Shares Model
Oregon Child Support Calculator 2026
Oregon uses the Income Shares model — both parents’ gross incomes are combined.
ℹOregon uses gross income — Gross = total income before any deductions.
$
$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official Oregon income shares formula. Courts may deviate based on special circumstances. Consult a Oregon family law attorney for your specific situation.
🌲 How Oregon Calculates Child Support
ModelIncome Shares — both parents’ combined gross income
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest9% annual interest on unpaid arrears
Oregon Key RuleOregon has no sales tax — and uses a straightforward Income Shares child support model
Additional InfoOregon provides substantial parenting time credit when the paying parent has 25%+ of overnights
⚖ 50/50 Custody in Oregon
Does Child Support Apply With 50/50 Custody in Oregon?
In most cases, yes. Oregon does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
$
$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a Oregon family law attorney for exact figures.
📋 Oregon Arrears Calculator
Oregon Child Support Arrears Calculator
Calculate total back child support including 9% annual interest Oregon applies to unpaid arrears.
⚠Oregon charges 9% annual interest on all unpaid child support arrears.
$
$
$
Total Arrears Owed (with 9% Interest)
$0
including Oregon 9% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* Oregon applies 9% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
Oregon Child Support Modification
Estimate your new payment and check if you qualify for a modification in Oregon.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
$
36+ months = eligible for routine review
$
Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
—
Time Since Order
—
* Qualification estimate only. Consult a Oregon family law attorney before filing.
📜 Updated 2026
Oregon Child Support Laws 2026
Key rules, age cutoffs and what you need to know in Oregon.
FORMULA How Oregon Calculates Child Support
Oregon Revised Statutes Section 25.275 governs child support. Oregon uses Income Shares with published schedule tables and a parenting time credit. Oregon has no sales tax.
AGE When Does Child Support End in Oregon?
Child support in Oregon ends when the child turns 18 — Support ends at 18 or high school graduation. Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in Oregon
Oregon charges 9% annual interest on unpaid child support arrears. There is generally no statute of limitations on child support debt.
ENFORCEMENT Oregon Child Support Enforcement
Oregon has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in Oregon
Child support can be modified in Oregon when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 Oregon Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
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Monthly Total
$0
Annual Total
$0
Next Payment
—
Days Until Due
—
Payments Remaining
—
Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a Oregon Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.