A child support order is written for the family you had on the day it was signed. When a job ends, a child’s needs shift, or two years of raises change the math, a child support modification in Washington State is how the order catches up with real life. It does not happen on its own, and the path you choose affects how quickly a new amount can take effect.
This guide walks through the options Washington law gives parents, what the court looks for, and what to prepare before filing. It is written for Washington orders only.
At Crouse Erickson, we handle these requests for Spokane families as part of a practice devoted entirely to family law.
How do you modify child support in Washington State?
In Washington, a parent changes a court child support order by filing a Petition to Modify with the superior court, or a Motion to Adjust if the order is at least two years old and income has changed. A petition generally requires a substantial change in circumstances, and any new amount usually applies only to payments due after the request is filed. Parents with an open Division of Child Support case can also ask DCS to review the order.
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Key Takeaways on Modifying Child Support in Washington State:
- Washington offers two court routes: a Petition to Modify and a Motion to Adjust.
- A petition based on a substantial change in circumstances can be filed at any time.
- Some changes are allowed without a substantial change once an order is one or two years old.
- A new amount generally reaches back only to the date the request was filed, not earlier.
- An informal agreement between parents does not change a court order.
The sections below explain each point and how it plays out in practice.
Modification or Adjustment: Which Route Fits Your Situation?
Washington separates a full modification from a narrower adjustment. Choosing the right one matters because the requirements, timing, and scope are different. The table below compares the three main options.
| Option | When it is available | What it can change |
| Petition to Modify | Any time there is a substantial change in circumstances, or after one year for certain reasons such as severe economic hardship | The support amount and other terms, such as daycare, educational expenses, or which parent claims the child for taxes |
| Motion to Adjust | After 24 months from entry or the last modification, based on changes in income or in the economic table | The support amount |
| DCS review | When a parent has an open Division of Child Support case and the order meets DCS review criteria | Handled through DCS and, for court orders, the county prosecutor’s office |
An adjustment is typically a simpler request when the only issue is that incomes have moved. A petition is a better fit when something about the family or the child has changed, or when you need to add or remove terms beyond the monthly number.
What Counts as a Substantial Change in Circumstances?
Under RCW 26.09.170, a parent may petition for a modification “based upon a showing of substantially changed circumstances at any time.” The statute does not list every qualifying event, so courts look at the facts of each case. Generally, the change has to be meaningful and something that was not already known when the current order was entered.
Changes that commonly support a petition include:
- An involuntary job loss or a significant, lasting drop in income
- An illness or injury that limits a parent’s ability to work
- A change in the child’s needs, such as new medical, educational, or psychological needs
- A significant change in where the child lives or the residential schedule
- A parent becoming responsible for the support of another child
Some changes do not qualify. The same statute says that voluntary unemployment or voluntary underemployment, by itself, is not a substantial change, and RCW 26.19.071 allows a court to impute income to a parent who is voluntarily out of work. A raise for the parent who receives support, or a circumstance both parents knew about when the order was entered, is also unlikely to carry a petition on its own.
Changes Washington Allows Without Proving a Substantial Change
Washington also builds in points where an order can be revisited even if nothing dramatic has happened. These timelines come from RCW 26.09.170:
- After one year: An order can be modified if it works a severe economic hardship on either parent or the child in practice.
- After one year: Support can be extended past the child’s 18th birthday if the child is still in high school and needs support to finish.
- After one year: An automatic adjustment provision can be added to the order.
- After 24 months: The order can be adjusted based on changes in the parents’ incomes or in the economic table, with no showing of substantially changed circumstances.
If a 24-month adjustment would change the amount by more than 30 percent and cause significant hardship, the court may phase it in over six months. Updates to the state’s economic table do not rewrite existing orders by themselves, so a parent who wants the current table applied has to ask.
How the Court Process Works in Washington
A modification is its own case, even when it follows a divorce that ended years ago. RCW 26.09.175 sets out the basic procedure, and the Washington courts publish mandatory forms for each stage.
Filing the Petition and Worksheets
The case starts when a parent files a petition along with Washington State Child Support Schedule worksheets. The state’s Petition to Modify Child Support forms include the summons, the petition itself, a confidential information form, and a financial declaration. Supporting financial records, such as tax returns and pay stubs, are filed under a sealed cover sheet.
Serving the Other Parent
Serving the Other ParentThe other parent must be served with the summons, petition, and worksheets. When the order being changed is a Washington decree, RCW 26.09.175 allows personal service or any form of mail that requires a return receipt. If support has been assigned to the state because of public assistance, the state must be served too.
Responding to and Deciding the Case
The responding parent has 20 days after service to serve and file an answer and worksheets, or 60 days if served outside Washington. Unless the parents agree to arbitration, the court usually decides the case on the written record: the petition, answer, worksheets, and declarations. A parent who wants live testimony must file a motion no later than 10 days after notice of the hearing and show extraordinary circumstances, such as a credibility dispute.
When Does a New Child Support Amount Take Effect?
Timing is where many parents lose money without realizing it. RCW 26.09.170 says a modification applies only to installments that come due after the petition or motion is filed. A court generally cannot reach back and reduce, or increase, payments for months before that date.
Keep Paying the Current Order
Until a judge signs a new order, the existing one stays in force. Stopping or reducing payments on your own can create back support that the court may not be able to erase later. If your income has already dropped, filing sooner rather than later protects the date a change can start.
Asking the Division of Child Support to Review an Order
Parents who receive services from the Division of Child Support, or whose children receive public benefits such as TANF or Medicaid, have another path. According to Washington Law Help’s guide to DCS reviews, DCS will review an order entered 35 months ago or more, and earlier in some situations. DCS looks for an anticipated change of at least 15 percent, up or down.
Court Orders Go Through the Prosecutor’s Office
When the support order came from a court, the DSHS Division of Child Support explains that the modification request moves through the county prosecutor’s office. The prosecutor represents the state’s interest, not either parent individually. Parents who want their own advocate often hire private counsel alongside or instead of this route.
Modifying Support When a Parent Has Moved Out of Washington
Families rarely stay put, and moving does not end a Washington order. Under Washington’s version of the Uniform Interstate Family Support Act, RCW 26.21A.120, Washington continues, exclusive jurisdiction to modify its own order as long as one parent or the child still lives in the state. The parties can also consent in a record or in open court to Washington keeping the case.
Orders From Another State
The reverse also holds. A Washington court can modify another state’s order only in the limited circumstances set by RCW 26.21A.550, so parents who moved to Spokane with an out-of-state order should confirm which court has authority before filing.
Documents to Gather Before You File
A modification is decided largely on paper, so the strength of the file matters. Before filing or responding, it helps to collect:
- The current child support order and worksheets
- Recent pay stubs and the last two years of tax returns for your household
- Records of health insurance premiums, daycare costs, and extraordinary medical or educational expenses
- Documents that show the change, such as a termination letter, medical records, or school records
- Proof of any support you pay for other children
FAQs
Can parents agree to change child support without going to court?
Parents can agree on a new amount, but the agreement does not change a Washington child support order until a court enters a modified order.
An agreed modification still needs worksheets, and RCW 26.19.075 says a court may not deviate from the standard calculation based only on the parents’ agreement. Until a new order is entered, the old amount remains enforceable.
Does losing my job mean my child support will go down?
No. An involuntary job loss can be a substantial change that supports a modification in Washington, but it does not lower support automatically. The parent must file a petition, and the new amount usually applies only from the filing date forward. If the court finds the unemployment is voluntary, it can impute income instead of reducing support.
Does remarriage affect child support in Washington?
No. Remarriage by either parent does not, by itself, change a Washington child support order. Under RCW 26.19.075, a new spouse’s income can be considered as a reason to deviate from the standard amount, but it is not enough on its own to justify a deviation. A parent who remarries still has to request a modification for any change to take effect.
Can child support change if the parenting schedule changes?
Yes. In Washington, a significant change in how much time the child spends with each parent can support a child support modification, and RCW 26.19.075 lets the court consider the residential schedule when setting support. The court will not reduce support in a way that leaves the receiving household without enough to meet the child’s basic needs.
How long does a child support modification take in Washington?
There is no fixed timeline for a Washington child support modification. The responding parent has 20 days after service to answer, or 60 days if served out of state, and most cases are then decided on written materials rather than a trial. A Motion to Adjust is often quicker than a full Petition to Modify because it addresses only the support amount.
Speak With a Spokane Family Law Attorney About Your Order
The right request, filed at the correct time, can make a real difference in what you pay or receive over the life of an order. Crouse Erickson focuses exclusively on family law and prepares every modification as though it may need to be argued, so the numbers and records are ready if the other parent disagrees.
If your circumstances have changed and you are wondering whether your Washington order should change with them, call our Spokane office at (509) 624-1380 to schedule a confidential consultation.
