Colorado Child Support Disputes After an Income Change

The Ten Percent Test, and What It Actually Measures

This is the part parents most often get backward. The ten percent is not a change in your income. It is the change in the monthly support figure that results when the guideline is rerun on your circumstances as of the date you file.

A parent whose pay dropped by a quarter can still land under ten percent, because the guideline blends both incomes, overnights, health insurance, and child care into a single output. Running the number is how you find out, and our Colorado child support calculator gives you a first estimate before anyone files anything.

The test is also a screen rather than a verdict. Colorado courts have treated the ten percent presumption as rebuttable rather than conclusive, which means a smaller change can still be argued in unusual circumstances. It also means a change above ten percent is a strong starting position rather than the end of the analysis.

Your Number May Have Changed Even If Your Income Did Not

Colorado rewrote its child support guidelines, and the revised guideline provisions took effect on March 1, 2026^[2]. A 2026 follow-up act corrected cross-references inside those new provisions without changing how the calculation works^[3]. The rewrite was substantial enough that some orders are now out of step with the current formula on their original facts.

• Parenting time counts from the first overnight. Under the prior rule a parent received no shared parenting adjustment until reaching a threshold number of overnights, and time below that line did not register at all. That cutoff is gone.
• The support schedule was rebuilt. The underlying table of basic obligations was updated, and the schedule now reaches further up the combined income range than it did before.
• Low-income provisions changed. A self-support reserve and a graduated calculation just above it replaced sharper jumps at the bottom of the income range.

Nothing about this updated existing orders automatically. An order entered before March 2026 keeps running at its old number until a parent files or the parents agree to change it.

A parent who had real parenting time but sat below the old overnight cutoff is the most likely to see a difference. That makes the Colorado child custody schedule worth counting carefully before you run the guideline.

Your Filing Date Is the Deadline That Costs Real Money

Colorado modifies support only as to installments coming due after the motion is filed. The order cannot be adjusted backward to the day your income changed, no matter how well documented that day is. Waiting three months to file means paying the old amount for three months.

The statute recognizes one exception to the no-retroactivity rule, plus one useful protection. When a court-ordered, voluntary, or mutually agreed change of physical care occurs, support can be modified back to the date the child actually moved. That exception turns on where the child lives, not on a change in income.

The reach-back is capped at five years before the motion is filed. A court can go past that cap if it finds the limit would be substantially inequitable, unjust, or inappropriate. The cap also does not foreclose relief available under another statute or court rule.

The protection is less well known and worth using. A court may modify the installments falling between your filing date and the entry of the order. That holds even if the circumstances justifying the modification no longer exist by the time the order is entered.

A three-month gap in work that has resolved by the hearing can still produce relief for those three months. It only works if you filed while it was happening.

If the conclusion is that the number needs to be recalculated, the path shifts. The next step is a Colorado child support modification motion, which carries its own filing requirements, financial disclosures, and evidentiary standard.

Not sure whether your change clears the threshold, or whether the other parent’s does? A free, no-pressure consultation will give you a clear read on the number and the timing before anything is filed.

What Happens to the Existing Order While You Wait

It stays in force, and it keeps generating obligations. Every installment that comes due and is not paid becomes a final money judgment on the day it is missed, without any further action by the court. That happens whether or not a modification motion is pending.

The practical consequence is that unpaid months during a pending motion are still collectible. Colorado child support enforcement tools such as income assignments, judgment liens, and contempt proceedings remain available to the other parent the entire time your case is waiting for a hearing.

Paying what you can and documenting every payment is the better posture. A parent who pays partially and files promptly is in a very different position than one who stops paying and explains afterward. That gap widens once back child support and arrears begin drawing interest on the unpaid balance.

One mechanical detail gets missed constantly. If your order carries an income assignment, the new amount does not reach your employer until an updated notice is served^[4]. A modified order with a stale withholding notice means the old figure keeps coming out of your paycheck.

When the Other Parent’s Income Drop Looks Voluntary

Colorado does not take a reduced paycheck at face value. If a parent is voluntarily unemployed or underemployed, child support is calculated on a determination of potential income rather than on what that parent is actually earning. The court is asking what this person could reasonably earn, not what they chose to earn.

The statute carves out three situations where potential income is not determined:

• A parent who is physically or mentally incapacitated.
• A parent caring for a child under twenty-four months for whom the parents owe a joint legal responsibility.
• A parent who is incarcerated under a sentence of 180 days or more.

Outside those carve-outs, the argument is about good faith and reasonableness. A layoff, a documented health limitation, or a career change that is objectively sensible is not the same as a resignation timed to a support hearing. The evidence that decides it is usually the job search record, the industry context, and the timing.

If You Are the Parent Receiving Support

A motion to reduce support is not a decision, and you are not limited to responding to the other parent’s version of the numbers. The inputs that set the original order under Colorado child support law are the same ones that will set the new one, and each of them can be verified.

• Run the guideline yourself. If the recalculation produces less than a ten percent change, the motion has a threshold problem before the merits are reached.
• Test whether the change is continuing. A reduction that has already reversed, or one with a clear end date, is vulnerable on the second half of the standard.
• Verify the income figure. Tax returns, bank deposits, K-1s, and employer records often tell a different story than a financial affidavit.
• Check the overnights. Since March 2026 every overnight affects the calculation, so an inflated schedule in the worksheet changes the output.
• Ask whether the reduction was voluntary. If it was, potential income may apply and the order may not move at all.

The increase side works the same way. If the paying parent got a promotion, a new bonus structure, or sold a business, you can file too, and the same ten percent test applies in your favor.

What Documentation Moves the Number

Support modifications are decided on financial records, not on descriptions of what happened. The parent with the cleaner documentation usually controls the calculation.

• Proof of the change itself. A separation letter, a revised offer letter, a disability determination, or profit and loss statements covering the relevant period.
• Income for the full picture. Recent pay stubs, the last two or three years of tax returns, and documentation of bonuses, commissions, and distributions.
• Your job search record. Applications, interviews, and rejections are what separate an involuntary reduction from a voluntary one in the court’s eyes.
• Current add-ons. What you actually pay to insure the child, plus work-related child care, both of which feed directly into the guideline.
• An accurate overnight count. The schedule as it is actually being exercised, not the schedule as it appears in an order that everyone has drifted from.
• The payment history. The Family Support Registry record establishes what has been paid and what the balance is as of the filing date.

How Johnson Law Group Handles Support Disputes After an Income Change

We run the number before we talk about strategy. The first question is whether the recalculation actually clears ten percent, because that answer determines whether you have a motion or a conversation. Parents are often relieved, and sometimes disappointed, by what the guideline produces.

From there the work is documentary. We help you assemble the record that proves the change is both real and continuing, and we pressure test the other side of it the same way opposing counsel will. We would rather tell you the case is thin now than after a hearing.

We also handle timing directly. If a filing protects months you would otherwise lose, we say so and we move. If waiting one more quarter for business records will produce a better case, we say that instead.

Throughout, the North Star is the same one the guideline uses, which is what your child actually needs and what each parent can actually contribute. Support is arithmetic applied to documented facts, and our job is to make sure the facts are documented correctly.

You will also know where the matter stands between filings. Our client portal gives you visibility into what has been filed, what is pending, and what the court has ordered, without waiting for a status call.