What Counts as a Material Change in Circumstances for Child Support in Kansas
In Kansas, a material change in circumstances is required to modify child support within three years of the original or last modification order, and not after that. Kansas sets no percentage, and a change can reach back to the first day of the month after you file.
What is a material change in circumstances for child support in Kansas?
The statute does not define it. It says that within three years of the date of the original order or a modification order, a court may modify any prior child support order when a material change in circumstances is shown, and that if more than three years have passed since the original or modification order, a material change in circumstances need not be shown (K.S.A. 23-3005(a)). So the law has a clock, not a percentage.
Is there a percentage rule in Kansas?
No. The statute sets no percentage change that triggers modification. The court follows the Kansas child support guidelines adopted by the Supreme Court (23-3002(a)(1)), and the Kansas child support modification calculator shows the gap in dollars and percent but does not give a pass or fail.
What changes after the three years?
The material change requirement drops away. If more than three years have passed since the original order or the last modification order, you can ask for the guideline amount without proving a change. That is why the first question in the calculator is the age of the order.
Does the three years restart after a modification?
Yes. The statute counts from the date of the original order or a modification order, so each modification order restarts the clock (23-3005(a)). A failed motion does not appear in the text, so ask an attorney how a denied motion counts.
What can the Kansas court consider in setting the amount?
It follows the guidelines and, for a parent who has lost income or a job because a professional license was lost, revoked, suspended or surrendered for professional misconduct or because of voluntary underemployment, it considers the total value of the parent’s qualified retirement accounts (23-3002(a)(2)). It can also order those accounts used to pay an arrearage in a one-time lump sum on a distributable event (23-3002(b)).
From what date can the order change?
The court may make a modification retroactive to the first day of the month following the filing of the motion (23-3005(b)). Every month before that is lost, and so is the filing month itself:
| Monthly difference | Lost after 6 months | Lost after 12 months |
|---|---|---|
| $100 a month | $600 | $1,200 |
| $200 a month | $1,200 | $2,400 |
| $400 a month | $2,400 | $4,800 |
Federal law also bars retroactive modification of support already due (42 U.S.C. 666(a)(9)).
What about health insurance information?
The court may order each parent to sign the documents, including releases, needed so both parents can get information from and communicate with the child’s health insurance provider, whichever parent owns or pays for the coverage (K.S.A. 23-3003). Ask for it in the motion if coverage is part of your dispute.
What happens next?
Read how to modify child support in Kansas for the filing steps, and check what stays owed with the Kansas arrears calculator.
Frequently asked questions
How long must I wait to modify Kansas child support without proving a change?
More than three years since the original order or the last modification order.
Does a Kansas modification restart the three years?
Yes. The three years run from the date of the original order or a modification order.
Is there a Kansas percentage rule for modification?
No. The statute sets no percentage; the court applies the guidelines.
How far back can Kansas child support change?
To the first day of the month following the filing of the motion.
Can Kansas use retirement accounts for child support arrears?
In the case of lost income due to professional misconduct or voluntary underemployment, the court shall order the use of qualified retirement accounts to pay an arrearage in a lump sum on a distributable event.
Official sources
- K.S.A. 23-3005: modification of child support
- K.S.A. 23-3002: determination of the amount of child support
- K.S.A. 23-3001: minor children; support and education
- K.S.A. 23-3004: payment through the central unit
- K.S.A. 20-165: child support guidelines and case annotations
- 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 Kansas statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Kansas attorney.