Mortgage deficiency SOL in Colorado

Rule or statute summary

In Colorado, the statute of limitations (“SOL”) for a mortgage deficiency lawsuit depends largely on what type of legal claim the lender is bringing after foreclosure. A “mortgage deficiency” generally means the lender seeks the remaining unpaid balance after the lender liquidates the property (e.g., via foreclosure sale) and applies the sale proceeds—leaving a shortfall.

In practice, Colorado courts and litigants usually frame the deficiency claim in terms of one of these general buckets:

1. A contract claim based on the written promissory note / mortgage documents (most common).
2. A liability theory created by statute (less common for traditional deficiency complaints, but can arise depending on how the pleadings are drafted).
3. An “account” or other debt theory (sometimes asserted in certain loan-servicing contexts; applicability depends on the pleadings and the way the debt is characterized).
4. Other theories (including tort or statutory debt-collection theories)—these are less typical for true deficiency claims, but can affect SOL analysis if the case is re-characterized.

Written contracts are often the controlling bucket

For written promissory notes and other written loan agreements, Colorado typically applies the default 6-year SOL for actions “upon a contract or agreement in writing.” The practical takeaway: if the lender sues to recover the unpaid balance because you signed a written note (and the lender is enforcing that written obligation), you will often be testing 6 years under C.R.S. § 13-80-103(1).

Accrual matters—don’t assume the default start date

A common timing error is to assume the SOL starts on the date of default. For deficiency lawsuits, the relevant question is usually when the lender’s claim accrues—i.e., when the lender has a complete, enforceable right to sue for the unpaid balance. In many deficiency scenarios, accrual is tied to foreclosure events such as when the sale occurs and/or when the lender can determine the deficiency amount after applying proceeds.

Because accrual can be fact-specific (and depends on what the lender alleges and proves), you should treat the SOL start date as a testable litigation fact—not a universal rule.

Citations

The Colorado SOL provisions most commonly implicated when a lender’s deficiency claim is framed as enforcement of a written loan obligation include:

• C.R.S. § 13-80-103(1) — 6 years for actions “upon a contract or agreement in writing.”
• C.R.S. § 13-80-108 — SOL for actions “upon a liability created by statute” (relevant if the pleading relies on a statutory liability theory rather than a contract theory).
• C.R.S. § 13-80-107 — SOL for actions “upon an account” (potentially relevant depending on how the debt is characterized in the complaint).
• C.R.S. § 13-80-101 — general SOL framework/definitions used in Colorado’s limitations statutes.

For foreclosure-by-public-trustee timing context (often referenced alongside deficiency arguments, even though it is not the deficiency SOL itself):

• C.R.S. § 38-38-101 et seq. — foreclosure framework (helpful for identifying the foreclosure sale date and related record events).

Key takeaway from the statutes: if the lender sues to collect the unpaid balance based on the written promissory note / written loan agreement, your SOL analysis will most often be governed by C.R.S. § 13-80-103(1) (6 years).

Gentle note: This is general informational guidance and not legal advice. SOL disputes can turn on the exact allegations in the complaint, how the debt is characterized, and when accrual occurred on the specific record.

Use the calculator

You can use DocketMath’s statute-of-limitations calculator to test whether a Colorado deficiency lawsuit appears timely under the likely SOL bucket.

Primary CTA: /tools/statute-of-limitations

Run the Statute Of Limitations calculation in DocketMath, then save the output so it can be audited later: Open the calculator.

1) Match the claim type to the lender’s pleading

Start by selecting the closest category to how the complaint frames the debt:

2) Enter the “accrual reference date”

The calculator needs a start date that reflects when the claim accrued. For deficiency claims, that can be fact-specific. Common accrual reference points used in deficiency timelines include:

• Date of foreclosure sale (often used as a proxy when the deficiency becomes ascertainable)
• Date the lender determined/confirmed the deficiency amount (if the pleading and record support a later ascertainability date)
• Other accrual date alleged in the complaint or reflected in the supporting documentation

Because this step drives the result, choose dates that match the record (or run alternatives if you think accrual is disputed).

3) Enter the filing date

Enter the case commencement / filing date from the docket or caption.

4) Read the output

DocketMath will compute (based on your inputs):

• SOL end date = accrual reference date + the selected statutory period
• whether the filing date falls within or outside the SOL window
• days remaining / days late depending on the dates you entered

Illustrative example (not a prediction)

• Accrual reference date (proxy): 2022-03-15
• Filing date: 2028-04-10
• Selected bucket: Written contract / C.R.S. § 13-80-103(1) (6 years)

If you run those dates, the calculator compares:

• SOL end date: 2028-03-15
• Filing date: 2028-04-10
• Likely result: outside the 6-year window

5) Document your logic

If you’re building a timeline, keep a checklist:

Sources and references

Start with the primary authority for Colorado and confirm the effective date before relying on any output. If the rule has been amended, update the inputs and rerun the calculation.

• Colo. Rev. Stat. § 13-80-101

Related reading

• Choosing the right statute of limitations tool for Vermont — How to choose the right calculator
• Statute of limitations in Singapore: how to estimate the deadline — Full how-to guide with jurisdiction-specific rules
• Choosing the right statute of limitations tool for Connecticut — How to choose the right calculator