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One-Action Rule

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One-Action Rule

Cross-jurisdiction doctrine page. Legal information, not legal advice. Last verified: 2026-06-02.

Overview

The one-action rule (also called the single-action rule or, in its companion form, the security-first rule) provides that a creditor holding a debt secured by a mortgage or other lien on real estate may bring only one action to recover the debt or enforce the security, and must look first to the real-property collateral before reaching the debtor’s other assets. The canonical formulation, repeated almost verbatim across the states that have codified it, is that “there can be but one action for the recovery of any debt, or the enforcement of any right secured by mortgage upon real estate.”

The rule is a creature of statute, not common law, and exists today in a minority of (mostly Western) states — most prominently California, Nevada, Utah, Idaho, and Montana. It does two distinct things at once:

  1. Single action. A secured creditor must consolidate its remedies into one judicial foreclosure proceeding; it cannot sue on the note separately and also foreclose, nor foreclose its real and personal collateral piecemeal in successive suits.
  2. Security first. The creditor must exhaust the real-property security before it may reach the debtor personally (e.g., by setoff against deposit accounts), with any shortfall recoverable only as a statutorily constrained deficiency after sale.

The doctrine is mainly a mortgage-foreclosure rule, but it belongs in a tax-and- mortgage-foreclosure reference for two reasons. First, it directly governs the mortgage-foreclosure track and the availability of a deficiency-judgment (it is a Module-11b “restrictions” item on every jurisdiction page in a one-action state). Second, it shapes investor and lender behavior in workouts where tax delinquency, junior liens, and mortgage default overlap. It is conceptually adjacent to — but analytically separate from — anti-deficiency statutes, which cap or bar the amount of a post-sale deficiency rather than the number or sequence of actions.

Legal/financial framework

California — Code of Civil Procedure § 726

California is the source statute from which the other one-action states drew. CCP § 726(a) provides that “[t]here can be but one form of action for the recovery of any debt or the enforcement of any right secured by mortgage upon real property” — an action that must proceed by judicial foreclosure, in which the court orders a sale and may, after applying the fair-value limits of subsection (b), enter a deficiency judgment for the shortfall, capped at “the difference between the amount for which the real property … was sold and the entire amount of the indebtedness secured by the mortgage or deed of trust.” (Source: California Legislative Information, CCP § 726, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP&sectionNum=726. , retrieved 2026-06-02.)

The California Supreme Court has read § 726 to embody two rules in one statute: the “one action” rule and the “security first” rule. In security-pacific-v-wozab, 51 Cal.3d 991 (1990), the Court held that a bank that exercised a setoff against the debtor’s deposit accounts before foreclosing violated the security-first aspect — even though a setoff is not itself an “action” (a judicial proceeding) — and the sanction was waiver of the security interest, but not the underlying debt. The Court explained that “the security first aspect of section 726 [requires] the secured creditor to proceed against the security before enforcing the underlying debt,” and a creditor who violates it loses the security while the “judgment on the debt … is unaffected.” (Source: Stanford SCOCAL, Security Pacific National Bank v. Wozab, https://scocal.stanford.edu/opinion/security-pacific-national-bank-v-wozab-31202 , retrieved 2026-06-02.)

The companion single-action sanction is illustrated by walker-v-community-bank, 10 Cal.3d 729 (1974): where a single debt is secured by both real and personal property and the creditor judicially forecloses only the personal property first (taking a deficiency judgment in that action), it “thereby loses his security interest in the real property as against all parties,” because § 726 requires a creditor to exhaust all security in one action. (Source: Stanford SCOCAL, Walker v. Community Bank, https://scocal.stanford.edu/opinion/walker-v-community-bank-27792 , retrieved 2026-06-02.)

Nevada — NRS 40.430 and NRS 40.435

Nevada codifies the rule at NRS 40.430(1): subject to enumerated exceptions, “there may be but one action for the recovery of any debt, or for the enforcement of any right secured by a mortgage or other lien upon real estate,” in which the court enters judgment for the amount due, may “direct a sale of the encumbered property,” and applies the proceeds under NRS 40.462. The statute then enumerates a long list of acts that do not count as an “action” (appointing a receiver, exercising a non-judicial power of sale, enforcing UCC security interests, out-of-state collateral, bankruptcy proceedings, etc.), so that those steps do not consume the single permitted action. (Source: Justia, NRS 40.430, https://law.justia.com/codes/nevada/chapter-40/statute-40-430/ , retrieved 2026-06-02; corroborated by Nevada Legislature, NRS Chapter 40, https://www.leg.state.nv.us/nrs/nrs-040.html , table of contents retrieved 2026-06-02.)

The sanction is set by NRS 40.435: commencing or participating in a judicial proceeding in violation of NRS 40.430 does not forfeit the creditor’s rights in the collateral if the proceeding is stayed or dismissed before a final judgment, or converted into a compliant action — i.e., the violation is curable. But the rule is an affirmative defense the debtor must timely interpose; if it is not raised, it is waived, and if a final judgment is entered in the offending separate action, the mortgage or lien is released and discharged. (Source: search-confirmed text of NRS 40.435 via Nevada Legislature/Justia; full subsection text needs_verification against a directly fetched copy — see Sources.)

Utah — Utah Code § 78B-6-901

Utah Code § 78B-6-901(1) provides that “[t]here is only one action for the recovery of any debt, or the enforcement of any right, secured solely by mortgage upon real estate,” and that the judgment must state the amount due, order a sale of the mortgaged property, and direct the sheriff to sell and apply the proceeds. Utah extends the rule to deeds of trust; a lender that forecloses non-judicially under the Trust Deed Act (Utah Code § 57-1) and then sues for a deficiency uses up its single action, and a lender that forecloses judicially may include the deficiency claim in that one suit. (Source: Utah elaws mirror, § 78B-6-901, http://ut.elaws.us/code/78b-6-901/ , retrieved 2026-06-02; official text at le.utah.gov returned only navigation chrome on fetch — needs_verification against a directly fetched official copy.)

Idaho — Idaho Code § 6-101

Idaho’s statute mirrors California’s: “There can be but one action for the recovery of any debt, or the enforcement of any right secured by mortgage upon real estate which action must be in accordance with the provisions of this chapter,” followed by a list of acts excluded from the definition of “action” (receiverships, rents-and-profits enforcement, out-of-state collateral, power-of-sale under §§ 45-1503 / 45-1505, UCC remedies, deposit- account setoffs, bankruptcy and probate claims, and others). (Source: Idaho Legislature, Idaho Code § 6-101, https://legislature.idaho.gov/statutesrules/idstat/title6/t6ch1/sect6-101/ , retrieved 2026-06-02.)

Idaho’s sanction is notably debtor-favorable: in bennett-v-bank-of-eastern-oregon (Idaho 2020), the Idaho Supreme Court held that a creditor who pursued personal recovery before foreclosing violated § 6-101 and that “[the Bank’s] security interest in the property is unenforceable” — permitting the debtor to quiet title, i.e., to use the violation offensively as a “sword,” not merely as a defensive shield. (Source: Hawley Troxell practitioner analysis, https://hawleytroxell.com/insights/new-idaho-supreme-court-decision-allows-debtors-to-use-a-creditors-violation-of-the-one-action-rule-as-a-sword-not-just-a-shield/ , retrieved 2026-06-02; exact reporter citation needs_verification against the primary opinion.)

Montana — MCA § 71-1-222

Montana, which “adopted the one action rule from the California Code of Civil Procedure,” codifies it at MCA § 71-1-222(1): “There is only one action for the recovery of debt or the enforcement of any right secured by a mortgage upon real estate.” The court may direct a sale of the encumbered property and application of proceeds (including property taxes due at foreclosure), and if the sheriff’s return shows the proceeds insufficient, a deficiency “judgment can then be docketed for the balance against the defendant[s] … personally liable for the debt.” (Source: Montana Code Annotated, MCA § 71-1-222, https://mca.legmt.gov/bills/mca/title_0710/chapter_0010/part_0020/section_0220/0710-0010-0020-0220.html , retrieved 2026-06-02.)

State-by-state variation

StateStatute (retrieved)Reaches deeds of trust?Sanction for violationCurable?
californiaCCP § 726(a)Yes (mortgage or deed of trust)Single-action violation: loss of unforeclosed real-property security (Walker). Security-first violation by setoff: waiver of security, debt survives (Wozab).Setoff cure debated; pleaded as defense
nevadaNRS 40.430; sanction NRS 40.435YesSeparate-action judgment releases/discharges the lien; affirmative defense, waivable if not timely raisedYes — if stayed/dismissed before final judgment or converted
utahUtah Code § 78B-6-901Yes (via Trust Deed Act § 57-1)Loss of the single action / security-first protection; deficiency only after saleStatutory exceptions; cure needs_verification
idahoIdaho Code § 6-101YesSecurity interest unenforceable; debtor may quiet title offensively (Bennett, 2020)Limited; enumerated non-”action” carve-outs
montanaMCA § 71-1-222YesLoss of single-action protection; deficiency docketed only on sheriff’s-return shortfallPatterned on California construction

Common structure. Each statute (i) limits the creditor to one judicial action, (ii) directs a court-ordered sale, (iii) permits a post-sale deficiency against personally liable defendants, and (iv) carves out a list of acts (receivership, non- judicial power of sale, UCC/personal-property remedies, out-of-state collateral, bankruptcy/probate claims) that do not consume the single action.

Where the states diverge is the sanction:

  • Waiver-of-security, debt survives (California’s Wozab security-first branch): the creditor keeps a money judgment on the debt but loses the lien.
  • Loss of the unforeclosed security (California’s Walker single-action branch).
  • Release/discharge of the lien by operation of statute if a separate-action final judgment is entered (Nevada, NRS 40.435).
  • Lien rendered wholly unenforceable / quiet-title remedy for the debtor (Idaho, Bennett).
  • Curable defect if the offending proceeding is dismissed before final judgment (Nevada, expressly; California, contested).

Procedural posture matters. In Nevada (and generally) the rule is an affirmative defense: a debtor who fails to plead it in the separate action waives it. Guarantors, sureties, and non-mortgagor obligors may also waive the protection by contract (e.g., Nevada NRS 40.495), which is why commercial loan documents routinely contain one-action- rule waivers.

Most states do not have the rule. The 45-plus jurisdictions outside this cluster allow a lender to sue on the note and foreclose separately (subject to their own anti-deficiency and election-of-remedies doctrines). Do not assume a single-action requirement on a jurisdiction page unless its Module-11b entry cites the state’s own statute.

▸ For Investors / Operators. In one-action states, the rule reshapes acquisition and workout strategy on the mortgage-foreclosure track. A senior lender that takes a setoff, sues on the note, or forecloses mixed collateral out of sequence can forfeit the lien entirely (Idaho) or have it discharged (Nevada), creating openings for a buyer of the property or a junior position — but also meaning your own enforcement of any secured paper you acquire must run through a single judicial foreclosure with the deficiency claim included. Confirm whether the obligor is a borrower (protected) or a guarantor (can waive), and read the loan documents for an express one-action-rule waiver before structuring a separate suit.

▸ For Former Owners. If a lender in a one-action state pursued you personally — a lawsuit on the note, a bank-account setoff, or a second foreclosure — before properly foreclosing the secured real estate, that sequence may have waived or discharged the lien, and in Idaho may let you quiet title. These are affirmative defenses that can be lost if not raised in time. Separately, any surplus from a completed foreclosure sale above the debt belongs to you (see surplus-funds).

Practical implications

  • One action, not one remedy. The rule does not bar a deficiency; it bars splitting the recovery. A judicial foreclosure that includes the deficiency claim is fully compliant. The trap is sequencing — suing on the note first, setting off deposits, or foreclosing personal-property collateral before real-property collateral.
  • Setoffs are the classic violation. Wozab establishes that a lender cannot grab the borrower’s bank deposits ahead of foreclosing; doing so waives the security (California), and a bank exercising a banker’s lien in a one-action state should foreclose first.
  • Guarantor carve-outs are heavily litigated. Because guarantors can waive the rule, lenders pursue guarantors directly; courts police whether the “guarantor” is in substance the primary obligor (a sham guaranty) to prevent end-runs around the borrower’s protection.
  • Curability differs. Nevada’s NRS 40.435 lets a creditor undo a violation by dismissing the offending suit before final judgment; other states are less forgiving, and Idaho’s Bennett makes the violation an offensive quiet-title weapon for the debtor.
  • Interaction with anti-deficiency law. In California especially, the one-action rule (CCP § 726) operates alongside anti-deficiency statutes (CCP §§ 580a, 580b, 580d) — e.g., no deficiency after a non-judicial trustee’s sale (§ 580d) and none on purchase-money loans (§ 580b). The one-action rule limits the form/number of actions; the anti- deficiency statutes limit the amount recoverable. (Section numbers per California practitioner sources; the anti-deficiency specifics are tracked on california and deficiency-judgment — the §§ 580a/b/d text was not directly fetched here and is flagged needs_verification on this page.)

Key cases or authorities

mortgage-foreclosure, deficiency-judgment, surplus-funds, security-pacific-v-wozab, walker-v-community-bank, bennett-v-bank-of-eastern-oregon, california, nevada, utah, idaho, montana

Sources

Disclaimer. This page is legal information, not legal advice. It is a general, cross-jurisdiction summary that may be incomplete or out of date; law varies by jurisdiction and changes frequently. Nothing here creates an attorney-client relationship. Verify every statute and holding against the current primary source and consult a licensed attorney in the relevant jurisdiction before acting.

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