Wyoming prenuptial agreements can include infidelity clauses that impose financial penalties ranging from $50,000 to $500,000 or more on a cheating spouse, though enforcement depends on meeting strict requirements under Wyo. Stat. § 20-3-106. While Wyoming operates as a no-fault divorce state under Wyo. Stat. § 20-2-104, courts may still consider adultery when dividing property under the respective merits factor in Wyo. Stat. § 20-2-114, potentially shifting distributions from 50/50 to 60/40 or 65/35 in favor of the innocent spouse. This means an infidelity clause in a Wyoming prenup operates alongside the courts inherent ability to weigh marital misconduct in property division.
| Key Fact | Wyoming Details |
|---|---|
| Filing Fee | $85-$160 (varies by county) |
| Waiting Period | 20 days minimum after service |
| Residency Requirement | 60 days (Wyo. Stat. § 20-2-107) |
| Grounds for Divorce | No-fault only (irreconcilable differences) |
| Property Division | Equitable distribution |
| Fault Consideration | Yes, under respective merits factor |
| Prenup Statute | Wyo. Stat. § 20-3-101 through § 20-3-111 |
| Infidelity Clause Enforceability | Uncertain (no reported Wyoming cases) |
What Is an Infidelity Clause in a Wyoming Prenup
An infidelity clause in a Wyoming prenuptial agreement is a contractual provision that imposes specific financial consequences if one spouse commits adultery during the marriage. Wyoming courts have not yet issued a reported decision specifically addressing the enforceability of infidelity clauses, but such provisions fall under the general prenuptial agreement framework established by Wyo. Stat. § 20-3-101 through Wyo. Stat. § 20-3-111. These clauses typically specify either a lump-sum payment (commonly $50,000 to $500,000), an increased share of marital property for the faithful spouse, or forfeiture of alimony rights by the unfaithful party.
Infidelity clauses belong to a category called lifestyle clauses, which attempt to regulate spousal behavior during marriage. Common forms of infidelity clauses include:
- Lump-sum payments triggered by proven adultery (ranging from $50,000 to $500,000 depending on the couples wealth)
- Automatic forfeiture of spousal support eligibility
- Adjustment of property division percentages (for example, changing a 50/50 split to 70/30)
- Waiver of rights to specific assets such as the marital home or retirement accounts
- Escalating penalties based on the duration or severity of the affair
Wyoming adopted provisions modeled on the Uniform Premarital Agreement Act (UPAA) in 2003, which provides the legal framework for evaluating prenuptial agreement terms. Under Wyo. Stat. § 20-3-103, parties may contract with respect to rights and obligations in any property and the modification or elimination of spousal support. However, infidelity clauses present unique challenges because they attempt to penalize personal conduct rather than simply allocate property rights.
How Wyoming Courts View Adultery in Divorce
Wyoming courts do consider adultery when dividing property under the respective merits factor codified at Wyo. Stat. § 20-2-114, which directs judges to make property dispositions having regard for the respective merits of the parties. This statutory language allows Wyoming judges to weigh marital misconduct including adultery when determining equitable distribution, even though Wyoming requires only irreconcilable differences to grant a divorce under Wyo. Stat. § 20-2-104. Proven infidelity in Wyoming has resulted in property division shifts from 50/50 to 60/40 or 65/35 favoring the innocent spouse.
The distinction between fault-based grounds and fault-based consideration is crucial for understanding infidelity clauses:
- Wyoming does not recognize adultery as a ground for divorce (no-fault only state)
- Wyoming does permit adultery to influence property division percentages under the respective merits factor
- Wyoming judges exercise broad discretion when weighing fault in equitable distribution
- Courts have awarded disproportionate property shares to innocent spouses when the other party dissipated marital assets or engaged in misconduct
This dual framework creates potential tension with infidelity clauses. On one hand, Wyoming courts already have authority to penalize adultery through property division without a prenup. On the other hand, a prenup infidelity clause attempts to contractually predetermine the consequences of adultery, which could conflict with the courts equitable discretion or be viewed as an impermissible attempt to punish behavior rather than allocate property.
Enforceability of Infidelity Clauses Under Wyoming Law
Wyoming has not produced a reported appellate decision specifically addressing whether infidelity clauses in prenuptial agreements are enforceable, leaving couples and attorneys to rely on general prenup enforcement principles under Wyo. Stat. § 20-3-106. Under this statute, a Wyoming court will refuse to enforce a prenuptial agreement only if the challenging party proves either (1) the agreement was not signed voluntarily, or (2) the agreement was unconscionable when executed and the party was not provided fair and reasonable disclosure of the other partys property and financial obligations.
| Enforcement Defense | Statutory Basis | What Must Be Proven |
|---|---|---|
| Involuntary Signing | § 20-3-106(a)(i) | Duress, coercion, or fraud |
| Unconscionability + Disclosure Failure | § 20-3-106(a)(ii) | Both prongs must be satisfied |
| Public Policy Violation | General contract law | Clause violates Wyoming public policy |
For an infidelity clause to survive challenge in Wyoming, it should:
- Specify reasonable financial consequences (not punitive or confiscatory amounts)
- Define adultery clearly with specific conduct thresholds
- Include provisions for proving or establishing the occurrence of infidelity
- Avoid interfering with child custody, child support, or other non-waivable rights under Wyo. Stat. § 20-3-104
- Be proportional to the overall marital estate (forfeiting 100% of assets for one affair would likely be unconscionable)
The unconscionability standard under Wyo. Stat. § 20-3-106(a)(ii) requires that terms be so one-sided that no reasonable person would agree to them and enforcement would shock the conscience of the court. An infidelity clause demanding millions of dollars from a spouse with modest assets would likely fail this test.
Drafting an Enforceable Infidelity Clause in Wyoming
Wyoming prenuptial agreements with infidelity clauses should follow specific drafting practices to maximize the likelihood of enforcement, given that no Wyoming appellate court has directly ruled on such provisions. The agreement must be in writing and signed by both parties per Wyo. Stat. § 20-3-102, and while notarization is not statutorily required, Wyoming practitioners strongly recommend it to strengthen enforceability. Additionally, Wyoming courts treat agreements signed within two weeks of the wedding as potential evidence of coercion, so attorneys universally advise a 30-day buffer between signing and the ceremony.
Key drafting elements for a Wyoming prenup infidelity clause:
- Define infidelity precisely: Specify what constitutes a violation (physical contact, emotional affairs, specific acts) rather than using vague terms like cheating
- Set proportional consequences: Financial penalties should relate to the marital estates overall value (10-15% of marital assets is more defensible than 50% or more)
- Include proof mechanisms: Establish how infidelity will be proven (admissions, photographs, private investigator reports, text messages)
- Address reconciliation: Specify whether forgiveness or continued cohabitation after discovering infidelity waives the clause
- Separate from other provisions: Draft the infidelity clause as a severable provision so that if a court strikes it, the remainder of the prenup survives
- Obtain independent counsel: Each party should have separate legal representation, which Wyoming courts view favorably when assessing voluntariness
Wyoming requires fair and reasonable disclosure of property and financial obligations under Wyo. Stat. § 20-3-106(a)(ii)(A). This means both parties should exchange sworn financial affidavits listing every asset, liability, income source, and anticipated inheritance. Proper disclosure protects the infidelity clause from challenge on the grounds that one party did not understand what they were risking.
Alternatives to Infidelity Clauses in Wyoming Prenups
Given the uncertain enforceability of infidelity clauses in Wyoming, couples may achieve similar protective goals through provisions that courts are more likely to uphold. Wyoming courts already consider fault under the respective merits factor of Wyo. Stat. § 20-2-114, meaning some protection against infidelity exists without a specific clause. Structuring the prenup to reinforce rather than override this judicial discretion may produce more reliable results than attempting to impose fixed penalties.
Alternative approaches include:
- Separate property designations: Classify specific assets (family inheritances, business interests, retirement accounts) as separate property regardless of marital conduct, ensuring the innocent spouse retains their core assets
- Spousal support triggers: Rather than penalizing infidelity, structure support provisions that benefit the faithful spouse (for example, waiving alimony only if no marital misconduct occurred)
- Lifestyle maintenance clauses: Guarantee a certain standard of living for the dependent spouse, which a court is more likely to enforce than punitive damages
- Acknowledgment clauses: Include language acknowledging that either party may rely on the respective merits factor if divorce occurs, without attempting to predetermine the outcome
- Trust-based asset protection: Place certain assets in trusts prior to marriage, removing them from the marital estate entirely
These alternatives work within Wyomings existing legal framework rather than attempting to create new enforcement mechanisms that courts may reject.
How Infidelity Affects Property Division Without a Prenup
Wyoming is an equitable distribution state with an all-property approach, meaning courts can divide any asset including premarital property under Wyo. Stat. § 20-2-114. Without a prenuptial agreement, a Wyoming judge determining property division will consider the respective merits of the parties, the condition in which they will be left by the divorce, how and when assets were acquired, each spouses income and earning capacity, contributions to the marriage including homemaking, length of the marriage, custody arrangements, and the burdens imposed on the property. Adultery, financial dissipation, domestic violence, and substance abuse can justify awarding the innocent spouse a greater property share.
Typical outcomes when adultery is proven in Wyoming divorces without prenups:
| Scenario | Likely Property Division Impact |
|---|---|
| Single affair, no asset dissipation | Minimal adjustment (52/48 to 55/45) |
| Ongoing affair with marital funds spent on paramour | Significant adjustment (60/40 to 65/35) |
| Affair combined with abandonment | Larger adjustment possible (up to 70/30) |
| Mutual infidelity by both spouses | Generally neutral effect (50/50) |
These outcomes demonstrate why some couples prefer infidelity clauses: they want predetermined consequences rather than relying on judicial discretion. However, the Wyoming courts existing authority to adjust property division based on fault means that an infidelity clause essentially attempts to lock in a specific outcome that the court might otherwise determine differently after hearing all evidence.
Postnuptial Agreements and Infidelity Clauses
Wyoming permits postnuptial agreements, which are similar to prenuptial agreements but executed after marriage. Under Wyo. Stat. § 20-3-105, prenuptial agreements can be amended after marriage with a written modification signed by both parties, and no new consideration is required. This means a couple who did not include an infidelity clause in their original prenup can add one through a postnuptial agreement, or a couple without any prenuptial agreement can create one addressing infidelity after marriage.
Postnuptial infidelity clauses may arise in several contexts:
- Following discovery of an affair, the parties agree to remain married but add financial consequences for future infidelity
- One spouse suspects infidelity but cannot prove it and seeks contractual protection going forward
- The parties reassess their prenup after significant changes in wealth or circumstances
- A couple who married without a prenup decides they want documented expectations about fidelity
The same enforceability concerns that apply to prenuptial infidelity clauses apply to postnuptial versions. Additionally, postnuptial agreements may face heightened scrutiny because the confidential relationship between spouses creates greater potential for coercion or undue influence than exists between engaged couples.
Proving Infidelity Under a Prenup Clause
Wyoming prenuptial agreements with infidelity clauses must address how alleged adultery will be proven, since without a clear evidentiary framework the clause becomes practically unenforceable. The agreement should specify what types of evidence establish a violation, whether either party can contest the finding, and who bears the burden of proof. Common evidence types include admissions by the allegedly unfaithful spouse, photographs or videos, private investigator reports, credit card statements showing hotel charges or gifts, text messages and emails, and testimony from witnesses.
Proof mechanisms to consider when drafting:
- Preponderance standard: Most prenups use the preponderance of the evidence standard (more likely than not) rather than the higher criminal standard of beyond a reasonable doubt
- Arbitration clauses: Some couples designate a private arbitrator to determine whether infidelity occurred, keeping the matter out of court
- Admission provisions: Specify that a written admission by either spouse is conclusive proof of the violation
- Time limitations: Establish how long after discovery of infidelity a claim must be made under the clause
- Definition of infidelity: Determine whether the clause covers only physical sexual conduct or also includes emotional affairs, online relationships, or other boundary violations
Without these mechanisms, a dispute over whether infidelity occurred becomes a contested factual matter that requires litigation to resolve, potentially eliminating any efficiency benefits the prenup was intended to provide.
Wyoming Filing Fees and Divorce Process
Wyoming divorce filing fees range from $85 to $160 depending on the county, with Sheridan County and Natrona County charging $160 while other counties range from $70 to $120. As of January 2026, verify current fees with your local Clerk of District Court. Additional costs include process server fees of $25 to $80 for personal service by sheriff or private server, certified mail service costs, and potential jury demand fees of $50 for a six-person jury or $150 for a twelve-person jury.
| Cost Category | Typical Range |
|---|---|
| Filing fee | $85-$160 |
| Process server | $25-$80 |
| Attorney fees (uncontested) | $1,500-$3,000 |
| Attorney fees (contested) | $11,000-$50,000+ |
| Total uncontested divorce | ~$2,200 median |
Wyoming requires only 60 days of residency immediately preceding filing under Wyo. Stat. § 20-2-107, one of the shortest requirements in the nation. Alternatively, if the marriage was solemnized in Wyoming, at least one party must have resided continuously in the state from the time of marriage until filing. There is no separate county residency requirement. If you cannot afford filing costs, Wyoming courts offer fee waivers through the Affidavit of Indigency (Self-Help Packet 10) available at wyocourts.gov.