Oregon Child Support and Custody: The 73-Overnight Rule and Parenting Time Credits

Your parenting time schedule in Oregon directly affects your child support obligation — and a single overnight can mean the difference between paying the full amount and qualifying for a credit that reduces it by hundreds of dollars per month. Understanding the math before you finalize your schedule prevents expensive surprises.

The 73-Overnight Threshold

Oregon uses the Income Shares Model for child support, calculated under OAR 137-050-0700 through 137-050-0765. The system includes a parenting-time credit that reduces the paying parent's obligation — but only if they hit a minimum overnight count.

The threshold: 73 overnights per year (exactly 20% of the year).

• Below 73 overnights: Zero credit. You pay the full presumptive child support amount regardless of whether you have 1 overnight or 72.
• At 73 overnights: The credit activates and begins scaling upward.
• At 182-183 overnights: The credit reaches approximately 50%.

This creates a cliff effect that catches parents off guard. An 80/20 schedule that produces 72 overnights looks almost identical to one producing 73 overnights in practice — but the financial difference can be substantial. When you're designing your parenting time schedule, count the actual overnights for a full calendar year, including holidays and school breaks.

How the Credit Scales

The credit follows a graduated logistic curve rather than a straight line. At lower ranges (73-90 overnights), the credit increases slowly. It accelerates as the schedule approaches equal time and tapers as it nears full-time.

This design is intentional — it prevents gaming the system by adding a single overnight to jump to a dramatically different support amount. The transition is smooth, not a series of cliffs.

How to Count Overnights

Oregon averages overnight counts across two consecutive years to account for alternating holiday and vacation schedules. A holiday that falls with Parent A in odd years and Parent B in even years gets counted in both years and averaged.

Not all time spent with a parent qualifies as an "overnight" in the traditional sense. The rules allow:

• 12+ continuous hours during the day count as one full overnight
• 4-12 continuous hours count as half an overnight

This matters for parents whose work schedules prevent traditional overnights but who still provide substantial daytime care. A parent who picks the child up from school every day and returns them at 9 PM can accumulate partial overnight credits.

The Self-Support Reserve

Oregon protects low-income paying parents through the Self-Support Reserve (SSR). As of July 2025, if your calculated child support obligation would leave you with less than $1,522 per month in net income, the support order is automatically reduced.

Even with the SSR, there's a presumptive minimum of $100 per month — the court presumes every parent can pay at least this amount. Exceptions exist for parents with exactly equal parenting time, those incarcerated for 180+ days, TANF recipients, and those whose sole income is federal disability benefits.

What Counts as Gross Income

Oregon's definition is broad. Gross income includes wages, commissions, bonuses, interest, investment earnings, and even gifts and inheritances. Self-employed parents calculate income by subtracting ordinary business expenses and half of self-employment tax from gross receipts — but cannot deduct accelerated depreciation or investment tax credits without specific court approval.

Voluntary payroll deductions — HSA contributions, dependent care FSAs, and non-mandatory retirement plan contributions — get added back into gross income for the calculation.

Health Insurance and Childcare Add-Ons

On top of the base support amount, costs for the child's health insurance premiums and work-related childcare are divided proportionally based on each parent's share of their combined gross income. These add-ons can significantly increase the total monthly obligation.

Design Your Schedule With the Numbers in Mind

Most parents focus on the schedule first and discover the child support implications later. Working the other direction — understanding where the overnight thresholds fall and then building a schedule that serves both the child's needs and the financial reality — produces better outcomes for everyone.

The Oregon Child Custody & Parenting Plan Guide includes an overnight calculator worksheet that models different schedule options against the 73-overnight threshold, so you can see the financial impact before you commit.

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