How to Modify Child Support in Colorado

Life changes after divorce — incomes shift, kids get older, parenting schedules evolve. Colorado allows you to modify child support and parenting time when circumstances have changed substantially since the original order. But "substantially" has a specific legal meaning, and the process requires court approval.

When You Can Modify Child Support

Colorado courts will consider modifying child support when there has been a "substantial and continuing change in circumstances" since the last order. The clearest threshold: if running the current numbers through the Colorado child support guidelines produces an amount that differs by 10% or more from the existing order, the court presumes the change is substantial.

Common qualifying changes include:

• Income change — either parent's income has increased or decreased significantly (job loss, promotion, new career, disability)
• Parenting time change — the overnight schedule has shifted enough to change the calculation
• New children — either parent has additional children from a new relationship
• Insurance cost changes — health insurance premiums for the children have changed
• Childcare cost changes — daycare or after-school care expenses have started or stopped
• Emancipation — a child has turned 19 (or graduated high school if older than 19), reducing the number of supported children

How to File for a Modification

1. Run the current numbers. Use the Colorado Child Support Guidelines worksheet (or the state's online calculator) with current income figures and the current parenting schedule. If the new calculation differs by 10% or more from the existing order, you have grounds.

2. File a Motion to Modify. File in the same court that entered the original order. Include a completed updated financial affidavit (JDF 1111) showing your current income, expenses, and assets.

3. Serve the other parent. The motion and supporting documents must be properly served on the other parent, giving them time to respond.

4. Hearing or stipulation. If both parents agree on the new amount, you can file a stipulated modification without a hearing. If disputed, the court schedules a hearing where both parties present evidence.

5. Court enters new order. The modification is effective from the date the motion was filed (not the date circumstances changed), so file promptly when a qualifying change occurs.

Modifying Parenting Time

Changing the allocation of parental responsibilities (Colorado's term for custody and parenting time) requires a separate motion and a higher burden:

• For minor adjustments (shifting pickup times, adjusting holiday schedules), courts are generally flexible.
• For substantial changes (switching primary residence, significantly changing overnight percentages), you must show the change is in the child's best interests and that there has been a material change in circumstances.
• Within the first two years after the original order, the standard is even higher — you must show the child's present environment endangers their health or significantly impairs their emotional development.

Spousal Maintenance Modifications

Spousal maintenance (alimony) can also be modified if circumstances have substantially changed — but only if the original order did not explicitly state it is non-modifiable. Common grounds: the recipient's income has significantly increased, the recipient has remarried or is cohabitating, or the payer has experienced a genuine involuntary income loss.

Maintenance terminates automatically upon the death of either party or the remarriage of the recipient (unless the order states otherwise).

What You Cannot Change

The property division in your original decree is final — you cannot modify who got the house, how retirement accounts were split, or how debts were divided. Property division is a one-time allocation at the time of divorce. Only ongoing obligations (support, maintenance, parenting time) can be modified post-decree.

The Colorado After-Divorce Checklist covers the modification process and includes worksheets for tracking changed circumstances that may warrant a new filing.

See more Colorado guides →