HOW FAR BACK CAN RETROACTIVE CHILD SUPPORT GO IN COLORADO?
It depends on which kind of retroactive child support you mean, because Colorado law handles each situation under different rules. Support for the months before the first order follows different rules in a divorce or parental responsibilities case than in a parentage case, a modification generally reaches back only to the date the motion was filed, and unpaid support on an existing order stays owed as each payment comes due, with interest.
There is no single "five years" or "back to birth" rule that covers every Colorado case. This guide sorts out the different meanings, the statute behind each one, and what to gather if back support is at issue.
TABLE OF CONTENTS
- The Different Meanings of Retroactive Child Support
- Support for the Time Before the First Order
- Retroactive Modification Reaches Back Only to Filing
- Arrears and Interest on an Existing Order
- Public Assistance and Child Support Debt
- What to Gather If Back Support Is at Issue
- Frequently Asked Questions
- Talking With a Colorado Springs Child Support Lawyer
- Sources
THE DIFFERENT MEANINGS OF RETROACTIVE CHILD SUPPORT
People use "retroactive child support" for several different things. The table compares them.
| Situation | How far back | Main statute |
|---|---|---|
| Support before the first order in a dissolution, legal separation or other Title 14 support case | From the latest of the parents' physical separation, the filing of the petition, or service on the respondent, up to the month the ongoing order begins | C.R.S. 14-10-115, subsection (2)(a) |
| Support before the first order in a parentage case or a county administrative case | A period before the month the ongoing order begins; the statute sets no fixed number of years, and the amount is discretionary, based on listed factors | C.R.S. 19-4-116, subsections (4) and (6) |
| Modification of an existing order | Generally only back to the date the motion was filed; earlier only after a change of physical care, and then not more than five years before filing unless the court finds that limit unfair | C.R.S. 14-10-122, subsections (1)(d) and (5) |
| Arrears on an existing order | Every unpaid payment since the order, each a judgment when due, plus interest | C.R.S. 14-10-122, subsection (1)(c); C.R.S. 14-14-106 |
| Public assistance paid by a county | A debt to the county tied to the months assistance was paid | C.R.S. 14-14-104 |
The rest of this article walks through each row. The general calculation rules are covered in our overview of child support in Colorado.
SUPPORT FOR THE TIME BEFORE THE FIRST ORDER
In a Dissolution, Legal Separation or Parental Responsibilities Case
C.R.S. 14-10-115 lets the court order an amount reasonable under the circumstances for the period after the parties' physical separation, the filing of the petition, or service on the respondent, whichever date is latest, and before the month the ongoing support obligation begins. It is ordered without regard to marital misconduct, and the word the statute uses is "may," so the amount is up to the court.
Because the starting point is the latest of those three dates, back support in these cases begins no earlier than the filing of the case or service on the other party, whichever is later. If you separated long before anyone filed, the separation date alone does not open an earlier window.
That is one reason not to delay filing for divorce or legal separation when the other parent is not contributing.
In a Parentage Case
When parents were never married, support is often first set in a parentage case under Title 19. C.R.S. 19-4-116 lets the court, or the county child support unit acting as its delegate, order a reasonable amount for a period before the month the ongoing support obligation begins, and lets the court limit liability for past support to the share of expenses already incurred that it considers just.
The statute does not set a fixed number of years. Instead, the court has discretion and must consider all relevant factors, which, since amendments made by HB25-1159 took effect on February 1, 2026, include:
- The needs of the child, the age of the child and the child's financial resources
- The standard of living, circumstances, relative financial means and earning ability of the parents
- Each parent's responsibility for the support of others
- The value of services contributed by the parent with whom the child lives most of the time
- The standard of living the child would have enjoyed had the parents been an intact family, and the child support guidelines
- The paying parent's ability to pay current support in addition to a judgment for retroactive support
- Efforts the parents made to contact each other and communicate the child's needs, including requests for financial support
- Any attempt by a parent to avoid service
- Support the paying parent already provided, including money, supplies, food, clothing and gifts
- Efforts to restrict the other parent's access to the child
- Evidence that the parents had a financial agreement during the period
These factors cut both ways, so records matter. Proof that you asked for support, or that you provided money and necessities, can affect the amount. For how parentage and parenting time are decided, see Colorado parental responsibilities for unmarried parents.
Through County Child Support Services
County child support services can also establish support through the administrative process. Under C.R.S. 26-13.5-103, the notice of financial responsibility the county issues must tell the parent that support may be ordered, in an amount reasonable under the circumstances, for a period before the entry of an order establishing paternity, or, in certain other support cases, before the month the support obligation begins.
RETROACTIVE MODIFICATION REACHES BACK ONLY TO FILING
Once an order exists, a change in circumstances does not change past payments. Under C.R.S. 14-10-122, a modification should take effect as of the date the motion was filed, unless the court finds that would cause undue hardship or substantial injustice, and it cannot reach back before filing except after a mutually agreed change of physical custody.
The 10% figure in that statute is often misunderstood. It tests whether a recalculated support amount differs enough from the current order to count as a substantial and continuing change; it does not create back support, and it is measured on the support amount, not on a parent's income.
When physical care of the child changes, the statute allows the obligation to be modified or ended as of the date of the change. The court will not reach back more than five years before the motion was filed unless applying that limit would be substantially inequitable, unjust or inappropriate.
The filing steps and the 10% test are explained in whether a Colorado child support order can be modified.
ARREARS AND INTEREST ON AN EXISTING ORDER
Unpaid support on an existing order is not new support; it is a debt that already exists. Under C.R.S. 14-10-122, each payment becomes a final money judgment, called a support judgment, when it is due and not paid.
Interest is governed by C.R.S. 14-14-106, which ties the rate to Colorado's statutory interest rate of 8% a year under C.R.S. 5-12-101:
| Arrears due and owing | Interest rate | Compounding |
|---|---|---|
| Before July 1, 2021 | Four percent above the statutory rate, which is 12% a year | May be compounded monthly |
| On or after July 1, 2021 | Two percent above the statutory rate, which is 10% a year | May be compounded annually |
The statute also says that after July 1, 2021, interest on child support arrears accrues at the 10% rate. If your arrears go back before that date, have the interest calculation checked, because the two rates and compounding methods can apply to different periods.
The person owed the interest may waive it and is not required to keep interest accounts. The paying parent can ask the court to disallow or reduce interest for good cause, and the court considers whether there was good cause for nonpayment and whether paying, or disallowing, the interest would cause undue hardship or substantial injustice.
The court may also set an equitable repayment period for arrears and interest. The tools used to collect past-due support are described in Colorado child support orders.
PUBLIC ASSISTANCE AND CHILD SUPPORT DEBT
If a county paid public assistance for a child, C.R.S. 14-14-104 makes that assistance a debt owed to the county by the parent responsible for support. Where an order exists, the debt equals the arrears under the order up to the assistance paid; where none exists, the county can establish the debt from guideline support for the months assistance was paid, capped at the total assistance.
An agreement between the parents that would reduce the county's recovery does not bind the county unless it consents in writing.
WHAT TO GATHER IF BACK SUPPORT IS AT ISSUE
- The key dates: when you separated, when the case was filed, and when the other parent was served
- Income records for both parents for the period, such as pay stubs and tax returns
- Proof of any support already given, including receipts, bank statements and records of in-kind help
- Messages or letters asking for support, or showing attempts to communicate the child's needs
- Child care and health insurance costs you paid during the period
- For an existing order, the Family Support Registry payment history
FREQUENTLY ASKED QUESTIONS
How Far Back Can Child Support Be Ordered in Colorado?
In a dissolution or legal separation case, back to the latest of separation, filing or service. In a parentage case, the court has discretion to order support for a period before the order, based on statutory factors, without a fixed number of years in the statute.
Is There a Five-Year Limit on Retroactive Child Support in Colorado?
Not as a general rule. The five-year limit in C.R.S. 14-10-122 applies to modifying support after a change of physical care, and C.R.S. 19-4-116 does not set a fixed number of years for parentage cases.
What Is the Interest Rate on Past-Due Child Support in Colorado?
For arrears due on or after July 1, 2021, interest is two percent above the 8% statutory rate, or 10% a year, and may be compounded annually. The statute sets 12% a year, which may be compounded monthly, for arrears due before that date and says interest accrues at the 10% rate after July 1, 2021; in either case the person owed may waive it.
Can a Child Support Modification Be Retroactive?
Generally only to the date the motion was filed. The exception is a change of physical care, which can reach back to the date of the change, subject to a five-year limit.
Does the Other Parent's Ability to Pay Matter for Back Support?
Yes. In a parentage case, the paying parent's ability to pay current support plus a retroactive judgment is one of the listed factors, and in a dissolution case the amount must be reasonable under the circumstances.
TALKING WITH A COLORADO SPRINGS CHILD SUPPORT LAWYER
Back support questions turn on dates, records and which statute applies, and those details are easy to get wrong. A Colorado Springs child support lawyer can sort out which rule governs your case and what the records support.
Moran, Allen & Associates Family Law Attorneys works with parents in El Paso County and Teller County. Call (719) 447-0762 in Colorado Springs or (719) 686-7554 in Woodland Park, or schedule a consultation to talk through your situation.
This article is general information about Colorado law as of October 2026 and is not legal advice. Laws, interest rules and court procedures change, so speak with a licensed Colorado attorney about your own situation.
SOURCES
- C.R.S. 14-10-115, Child Support Guidelines (retroactive support in subsection (2)(a))
- C.R.S. 14-10-122, Modification, Retroactivity and Support Judgments
- C.R.S. 19-4-116, Parentage Judgment or Order and Retroactive Support Factors
- C.R.S. 26-13.5-103, Notice of Financial Responsibility
- C.R.S. 14-14-104, Recovery for Child Support Debt
- C.R.S. 14-14-106, Interest on Child Support Arrearages
- C.R.S. 5-12-101, Legal Rate of Interest
- HB25-1159, Child Support Commission Recommendations (Colorado General Assembly)
- HB25-1159, enrolled act text (amendments to C.R.S. 19-4-116)