What Counts as a Substantial Change in Circumstances for Child Support in Maine
In Maine, a child support order that varies more than 15% from the guidelines is a substantial change, and the court shall modify it if it is under 3 years old. At 3 years the court reviews it without a showing of change, and a change starts only from service.
What is a substantial change of circumstances for child support in Maine?
Maine defines one by a number. If a child support order varies more than 15% from the parental support obligation determined under the guidelines, the court or hearing officer shall consider the variation a substantial change of circumstances (19-A M.R.S. 2009(3)). Other changes can also qualify, but the statute’s test for the variance route is purely arithmetic.
What is the 15% rule for Maine child support modification?
Compare the weekly order with the weekly amount the guidelines would give today. If the difference is more than 15% of the order, there is a substantial change. The Maine child support modification calculator treats exactly 15% as not meeting it.
| Existing weekly order | Qualifies if the guideline is above | or below |
|---|---|---|
| $100 | $115 | $85 |
| $200 | $230 | $170 |
| $300 | $345 | $255 |
| $500 | $575 | $425 |
With a $200 weekly order a guideline amount of $250 is 25% higher and qualifies, and $230 is exactly 15% and does not.
What happens if the order is under 3 years old?
If it has been less than 3 years since the order was issued or modified and the variance exceeds 15%, the court or hearing officer shall modify the order according to the guidelines (2009(3)). The word “shall” leaves little room for discretion once the variance is shown.
What happens if the order is 3 years or older?
The court or hearing officer shall review the order without requiring proof or a showing of a change of circumstances and shall modify it if the amount differs from what the guidelines would award (2009(3)). So after 3 years you do not need the 15% variance at all, only a difference.
Does the 15% rule work for an order that deviated from the guidelines?
No. If the order was established under the deviation section, a 15% variation between the order and the guideline obligation does not constitute a substantial change of circumstances (2009(3)). The deviation section lets a court depart from the guidelines on written findings (19-A M.R.S. 2007).
From what date can the order change?
Child support orders may be modified retroactively but only from the date that notice of a petition for modification has been served on the opposing party under the Maine Rules of Civil Procedure (2009(2)). The weeks before service are lost:
| Weekly difference | Lost after 26 weeks | Lost after 52 weeks |
|---|---|---|
| $25 a week | $650 | $1,300 |
| $50 a week | $1,300 | $2,600 |
| $100 a week | $2,600 | $5,200 |
Federal law also bars retroactive modification of support already due (42 U.S.C. 666(a)(9)).
Where is the guideline obligation defined?
The guidelines, the table and the criteria for applying it are in 19-A M.R.S. 2006; the definitions of gross income, parental support obligation and total basic support obligation are in section 2001. Use those terms in your motion so the court can follow your math.
How do the weekly figures relate to monthly ones?
Maine guideline orders are weekly. The calculator converts to months by multiplying by 52 and dividing by 12, so $50 a week is about $217 a month. Use weekly figures when you compare your order with the guideline amount.
Can the court change the amount without a new filing?
Not by itself: the statute starts with a motion to modify support by a party or the department (19-A M.R.S. 2009(1)). A written agreement between the parents does not change the order until the court approves it.
What happens next?
Read how to modify child support in Maine for the filing and service steps, and check what stays owed with the Maine arrears calculator.
Frequently asked questions
What is the 15% rule for Maine child support modification?
A variance of more than 15% from the guideline obligation is a substantial change of circumstances.
What happens to a Maine order after 3 years?
The court reviews it without a showing of changed circumstances and modifies it if the amount differs from the guidelines.
Does a Maine deviation order qualify under the 15% rule?
No. A 15% variation is not a substantial change for an order set under the deviation section.
Are Maine child support amounts weekly?
Yes. Maine guideline orders use weekly amounts.
From what date can Maine child support change?
Only from the date the petition is served on the other party.
Official sources
- 19-A M.R.S. 2009: modification of existing support orders
- 19-A M.R.S. 2001: definitions, including gross income and earning capacity
- 19-A M.R.S. 2006: support guidelines
- 19-A M.R.S. 2007: deviation from the guidelines
- 42 U.S.C. 666(a)(9): no retroactive modification of support already due
A local family law attorney can review your situation — many offer a free consultation.
This is general information, not legal advice. It is based on the cited Maine statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Maine attorney.