Infidelity clauses in prenuptial agreements are largely unenforceable in Alberta due to Canada's no-fault divorce system. Under the Divorce Act, R.S.C. 1985, c. 3 (2nd Supp.), courts refuse to financially penalize spouses for adultery, as marital misconduct has no bearing on property division or spousal support. While Alberta's Family Property Act, S.A. 2003, c. F-4.7, s. 38 allows prenuptial agreements to govern property division, clauses imposing punitive consequences for cheating are considered contrary to public policy and will typically be struck from agreements without affecting remaining valid provisions.
Key Facts: Infidelity Clauses in Alberta Prenups
| Requirement | Alberta Standard |
|---|---|
| Governing Legislation | Family Property Act, S.A. 2003, c. F-4.7 |
| Infidelity Clause Enforceability | Generally unenforceable |
| Legal Advice Requirement | Mandatory under s. 38 (both parties) |
| Prenup Cost Range | $2,000–$8,000 (as of May 2026) |
| Divorce Filing Fee | $260 + $10 Central Registry = $270 |
| Property Division Type | Equitable division of matrimonial property |
| Residency Requirement | 1 year ordinary residence in Alberta |
| Adultery Impact on Division | None under no-fault system |
Why Alberta Courts Reject Infidelity Clauses in Prenups
Alberta courts do not enforce infidelity clauses in prenuptial agreements because Canada operates under a no-fault divorce system where marital misconduct like adultery cannot affect property division or spousal support calculations. The Divorce Act, R.S.C. 1985, c. 3, s. 8 establishes marriage breakdown as the sole ground for divorce, which can be proven through one-year separation (used by approximately 95% of couples), adultery, or cruelty—but the ground chosen has no impact on financial outcomes.
The landmark Ontario Court of Appeal decision in LeVan v. LeVan (2008) directly addressed an infidelity clause prenup situation where a wealthy businessman agreed to pay his wife a substantial penalty if he committed adultery. When the wife sought to enforce the clause after discovering his infidelity, the court struck it down as contrary to public policy. The court ruled that imposing financial penalties for personal misconduct is punitive rather than compensatory and conflicts with the principles underlying Canadian matrimonial law.
Alberta courts follow this reasoning. Under the Family Property Act, S.A. 2003, c. F-4.7, prenuptial agreements must address the equitable division of property rather than penalize moral behavior. Courts distinguish between legitimate provisions that protect assets versus punitive clauses designed to punish a cheating spouse financially.
The D'Andrade v. Schrage (2011 ONSC 1174) case further reinforced this principle when a spouse argued that a marriage contract should be voided because the other spouse had an affair during negotiations. The Ontario Superior Court rejected this argument, stating that domestic contracts are not meant to address the duty of fidelity.
What an Infidelity Clause Prenup Actually States
A cheating prenup penalty clause typically specifies that if one spouse commits adultery, certain financial consequences follow automatically upon divorce. These consequences might include forfeiture of spousal support entitlement, reduction in property division share, payment of a fixed monetary penalty (such as $50,000 or $100,000), or automatic transfer of the matrimonial home to the non-cheating spouse.
The typical infidelity clause prenup language reads: "In the event that either party engages in sexual relations with a person other than their spouse during the marriage, that party shall forfeit their entitlement to spousal support and shall receive only 25% of the matrimonial property rather than the standard 50% division."
However, such language creates three fundamental legal problems in Alberta. First, it conflicts with the no-fault divorce principle embedded in the Divorce Act. Second, it imposes a penalty for moral conduct rather than addressing legitimate property concerns. Third, it may be impossible to prove adultery occurred, requiring expensive litigation that courts seek to avoid.
The Legal Standard for Prenup Enforceability in Alberta
Alberta maintains stricter prenuptial agreement requirements than most Canadian provinces under Family Property Act, s. 37-38. Section 38(1) requires each party to acknowledge in writing, separately from the other party, that they are aware of the agreement's nature and effect, that they understand the possible future claims to property they are waiving, and that they are executing the agreement freely without compulsion.
Section 38(2) mandates that each party must make their acknowledgment before a lawyer who is not acting for the other party. This means both spouses must retain separate lawyers, and each lawyer must sign a certificate confirming the acknowledgment was properly completed. The total legal cost for a properly executed Alberta prenup ranges from $2,000 to $8,000 depending on complexity.
The Supreme Court of Canada's decision in Hartshorne v. Hartshorne (2004 SCC 22) established the governing framework for prenuptial agreement enforceability across Canada. The Court held that prenuptial contracts cannot be set aside simply because one spouse later believes the agreement was unfair when signed. However, for an agreement to be enforceable, it must operate fairly at the time of distribution, and the court must consider whether circumstances at separation were reasonably contemplated when the contract was formed.
This test creates particular challenges for infidelity clause prenups. Courts must ask whether imposing a cheating penalty was within the reasonable contemplation of both parties, and whether such a penalty operates fairly given Canada's no-fault system. The answer to both questions is typically no.
How Adultery Actually Affects Alberta Divorces
Adultery does not entitle a spouse to a larger share of property or increased spousal support in Alberta. Under both the federal Divorce Act and Alberta's Family Property Act, the reasons the marriage ended do not affect a spouse's legal obligation to support the other spouse or the division of matrimonial property.
The adulterous spouse retains full rights to receive spousal support if they otherwise qualify based on income disparity and need. Similarly, the spouse who committed adultery will not be required to pay additional spousal support as punishment for their behavior. Courts determine spousal support based on the factors in Divorce Act, s. 15.2, which include the length of the marriage, the roles each spouse assumed during the marriage, and the economic consequences of those roles.
The only scenario where infidelity might affect financial outcomes involves dissipation of marital assets. If a spouse spent significant matrimonial funds on an extramarital affair—paying for expensive gifts, travel, or an apartment for a paramour—the court may adjust the property division to account for this financial misconduct. However, this adjustment compensates for economic loss, not for the cheating itself.
Approximately 3% of Canadian divorces use adultery as the ground for divorce rather than one-year separation. This option allows couples to divorce immediately without waiting the full separation period, but it provides no financial advantage to the non-cheating spouse.
Lifestyle Clauses: The Broader Category of Unenforceable Provisions
Infidelity clauses belong to a broader category of lifestyle clauses in prenups that Alberta courts consistently refuse to enforce. Lifestyle clauses attempt to dictate personal behavior during marriage, including weight maintenance requirements (requiring a spouse to stay within a certain weight range), frequency of intimacy provisions, social media usage restrictions, relationship management rules (forbidding contact with certain individuals), and household responsibility mandates.
Alberta courts reject lifestyle clauses because they invade personal privacy and autonomy, making them unenforceable as a matter of public policy. When such clauses appear in an otherwise valid prenuptial agreement, courts will typically sever the offensive provisions while enforcing the remainder of the agreement.
The legal principle distinguishes between clauses that address legitimate financial and property concerns versus those that attempt to regulate personal conduct. A clause protecting a family business from division is enforceable; a clause punishing a spouse for gaining weight is not.
What Alberta Prenups Can Legally Include
Alberta prenuptial agreements can effectively address numerous financial matters even without infidelity clauses. Enforceable provisions under the Family Property Act include the division of property owned before marriage (identifying specific assets as exempt property), property acquired during marriage (specifying whether assets will be shared or kept separate), business interests and professional practices (protecting ownership shares and goodwill), debts and liabilities (allocating responsibility for pre-existing and future debts), spousal support provisions (setting waiver terms or establishing formulas), and the treatment of the matrimonial home (addressing whether pre-marriage equity remains exempt).
Alberta courts also recognize sunset clauses that cause the prenuptial agreement to expire after a specified number of years of marriage. For example, a prenup might state that its terms expire after 15 years, at which point the standard Family Property Act provisions apply. Courts view sunset clauses favorably because they acknowledge that circumstances change over long marriages.
Prenuptial agreements cannot bind courts on matters involving children. Parenting arrangements, decision-making responsibility, and child support will always be determined based on the child's best interests at the time of separation, regardless of what the prenup states.
Alternatives to Infidelity Clauses That Courts Enforce
Couples seeking protection against the financial consequences of a spouse's infidelity can include alternative provisions that Alberta courts will actually enforce. Asset protection clauses identify specific pre-marriage assets as exempt from division without conditioning this on behavior. A spouse who owns a business valued at $500,000 before marriage can designate that value as exempt property, ensuring they keep it regardless of why the marriage ends.
Spousal support waiver provisions allow both parties to waive entitlement to spousal support, which courts will generally enforce when both parties had independent legal advice and full financial disclosure. While this does not penalize a cheating spouse directly, it eliminates one financial obligation that might otherwise exist.
Gradient property division formulas can adjust the division percentage based on the length of marriage rather than conduct. For example, the agreement might specify that after 5 years of marriage, the spouse who entered with fewer assets receives 30% of appreciation on exempt property; after 10 years, 40%; after 15 years, 50%. This creates financial incentive without requiring proof of misconduct.
Trust structures established before marriage can hold assets outside the marital estate entirely. Property held in a properly structured family trust may not be subject to division under the Family Property Act at all, providing protection that does not depend on either spouse's behavior during marriage.
The Process for Creating an Enforceable Alberta Prenup
Creating an enforceable prenuptial agreement in Alberta requires following the Family Property Act, s. 38 requirements precisely. The process typically spans 4 to 8 weeks when both parties cooperate and involves several distinct stages.
The initial consultation occurs separately for each party with their respective lawyer. During this meeting, the lawyer explains the legal framework, identifies assets and debts to be addressed, and discusses goals for the agreement. Each party should bring complete financial documentation including bank statements, investment accounts, property valuations, business financial statements, and tax returns.
Financial disclosure must be comprehensive and honest. Incomplete disclosure is the leading reason Alberta courts set prenuptial agreements aside. Both parties must understand each other's complete financial picture before the agreement can be finalized.
Drafting typically involves one lawyer preparing the initial draft, which is then exchanged between lawyers for review and negotiation. The agreement must clearly identify what property remains separate, what property will be shared, and how future acquisitions will be treated.
The section 38 acknowledgment appointment requires each party to meet separately with their lawyer to sign the formal acknowledgment certificate. The lawyer confirms that the party understands the agreement's nature and effect, understands the property rights being waived, and is signing freely without compulsion. This certificate must be attached to the agreement.
Total costs range from $2,000 for straightforward agreements to $8,000 or more for complex situations involving business interests, multiple properties, or significant negotiation. Each party bears their own legal fees.
Challenging an Infidelity Clause Prenup in Alberta
Spouses seeking to enforce or challenge an infidelity clause prenup in Alberta face significant legal obstacles. The primary grounds for challenging any prenuptial agreement in Alberta include failure to comply with section 38 requirements (missing acknowledgment certificates or lack of independent legal advice), inadequate financial disclosure (hidden assets or materially incomplete information), unconscionability (terms so one-sided that no reasonable person would agree), duress or undue influence (pressure to sign without adequate time or under threat), and lack of capacity (mental incapacity at the time of signing).
For infidelity clauses specifically, the challenging party can argue that the clause is contrary to public policy under Canada's no-fault divorce system. The LeVan v. LeVan precedent provides strong authority for striking down punitive infidelity provisions.
The Hinton v. Hinton (2008 ABQB) decision established that when determining whether a prenuptial agreement was signed under duress, the test in family law is less onerous than the unconscionability test in contract law. However, allegations of duress must be supported by evidence—a properly completed section 38 acknowledgment stating the party signed freely and voluntarily creates a strong presumption against duress claims.
What Happens When the Prenup Contains Both Valid and Invalid Clauses
Alberta courts apply the doctrine of severability to prenuptial agreements containing both enforceable and unenforceable provisions. When an infidelity clause appears alongside legitimate property division terms, the court will typically strike the infidelity clause while preserving the remainder of the agreement.
This severability principle means that including an unenforceable infidelity clause does not invalidate the entire prenup. The court removes the offending provision and enforces what remains, provided the remaining terms still make sense as a coherent agreement.
However, if the infidelity clause is so central to the agreement that removing it fundamentally changes the bargain, the entire agreement might fail. For example, if the agreement states that all property provisions depend on neither party committing adultery, removing the infidelity clause might leave nothing meaningful to enforce.
Practical drafting advice suggests keeping infidelity clauses entirely out of Alberta prenuptial agreements. Their inclusion creates unnecessary litigation risk and drafting expense while providing no ultimate benefit given courts' consistent refusal to enforce them.
Comparison: Infidelity Clauses Across Canadian Provinces
| Province | Prenup ILA Required | Infidelity Clause Stance | Key Case Law |
|---|---|---|---|
| Alberta | Yes (mandatory) | Unenforceable | Follows LeVan |
| Ontario | Recommended only | Unenforceable | LeVan v. LeVan |
| British Columbia | Recommended only | Unenforceable | Hartshorne framework |
| Quebec | Not required | Unenforceable | Civil Code Art. 431 |
| Saskatchewan | Recommended only | Unenforceable | No-fault principles |
| Manitoba | Recommended only | Unenforceable | No-fault principles |
All Canadian provinces follow the no-fault divorce framework established by the federal Divorce Act, meaning infidelity clauses face the same fundamental enforceability problems nationwide. Alberta's mandatory independent legal advice requirement under section 38 provides additional protection against poorly-drafted agreements but does not change the substantive outcome for infidelity clauses.
Current Alberta Filing Requirements and Costs (2026)
As of May 2026, filing for divorce in Alberta requires submitting a Statement of Claim for Divorce to the Court of King's Bench. The filing fee is $260 plus a mandatory $10 Central Registry of Divorce Proceedings fee, for a total of $270. This fee applies uniformly across all Court of King's Bench locations including Edmonton, Calgary, and Red Deer.
Fee waivers are available for parties receiving Income Support, AISH (Assured Income for the Severely Handicapped), or similar social assistance programs. Other low-income individuals may apply for fee waivers by submitting an Application for Fee Waiver and Statement of Finances to the court.
The residency requirement for divorce in Alberta is one year of ordinary residence immediately before filing. Ordinary residence means the place where you regularly, normally, or customarily live—temporary absences for work or vacation do not interrupt residency.
As of January 2, 2026, Alberta introduced the Family Focused Protocol (FFP), a redesigned process for family law matters intended to streamline dispute resolution and encourage early settlement.
Frequently Asked Questions
Can I include a cheating clause in my Alberta prenup?
You can include an infidelity clause in your Alberta prenuptial agreement, but courts will almost certainly refuse to enforce it. Under Canada's no-fault divorce system, marital misconduct like adultery cannot be used to penalize a spouse financially. The clause will likely be severed from the agreement while other valid provisions remain enforceable. Alberta prenups cost $2,000 to $8,000 and must comply with Family Property Act, s. 38 requirements regardless of content.
Does adultery affect spousal support in Alberta?
Adultery does not affect spousal support entitlement or amounts in Alberta. The Divorce Act and Family Property Act both operate on no-fault principles, meaning the reasons for marriage breakdown have no bearing on support calculations. An adulterous spouse retains full rights to receive support if they qualify based on income disparity. The only exception involves dissipation of marital funds—if a spouse spent significant money on an affair, courts may adjust property division to compensate for the financial loss.
What is the penalty for adultery in a Canadian prenup?
Canadian courts do not enforce adultery penalties in prenuptial agreements. The LeVan v. LeVan (2008) Ontario Court of Appeal decision struck down an infidelity clause as contrary to public policy, ruling that imposing financial penalties for personal misconduct conflicts with no-fault divorce principles. Alberta courts follow this precedent. Any penalty clause for cheating will be severed from the prenup, leaving the offending spouse with the same rights they would have had without the clause.
How do I prove my spouse cheated to trigger the prenup clause?
Proving adultery requires credible evidence such as communications, photographs, witness testimony, or admissions. However, even with proof, Alberta courts will not enforce infidelity clauses in prenups due to no-fault divorce principles. The only practical use of proving adultery is to establish grounds for immediate divorce without completing the one-year separation period—but this provides no financial advantage. Approximately 3% of Canadian divorces use adultery as the ground rather than separation.
Are lifestyle clauses enforceable in Alberta prenups?
Lifestyle clauses that dictate personal behavior—including weight requirements, intimacy frequency, social media usage, or fidelity obligations—are not enforceable in Alberta. Courts view such clauses as invasive of personal privacy and autonomy. When lifestyle clauses appear in an otherwise valid prenup, courts sever them while enforcing remaining legitimate provisions addressing property division, spousal support, and debt allocation.
What can I include in my Alberta prenup instead of an infidelity clause?
Alberta prenups can effectively protect assets through legitimate provisions including identification of exempt property (assets owned before marriage), business interest protection, spousal support waivers or formulas, debt allocation, gradient property division based on marriage length, and sunset clauses that expire after specified years. These provisions achieve financial protection without requiring proof of misconduct and will actually be enforced by courts.
How much does a prenup cost in Alberta in 2026?
A prenuptial agreement in Alberta costs between $2,000 and $8,000 depending on complexity. This covers both parties' legal fees, as Family Property Act, s. 38 requires each spouse to have separate independent legal advice. Simple agreements with few assets may be closer to $2,000, while complex agreements involving business interests, multiple properties, or significant negotiation reach $8,000 or more. The section 38 acknowledgment process typically requires 4 to 8 weeks from initial consultation to final signing.
Can a prenup be overturned if my spouse cheated?
A prenuptial agreement cannot be overturned simply because one spouse committed adultery. The grounds for challenging a prenup in Alberta include failure to comply with section 38 requirements, inadequate financial disclosure, unconscionability, duress, or lack of capacity—not marital misconduct. The Hartshorne v. Hartshorne (2004 SCC 22) Supreme Court decision confirmed that parties cannot escape prenuptial obligations by claiming the agreement was unfair after receiving independent legal advice.
What is a sunset clause in a prenup?
A sunset clause causes the prenuptial agreement to expire automatically after a specified period, typically 10 to 20 years of marriage. After expiration, the standard Family Property Act provisions apply to any divorce. Alberta courts view sunset clauses favorably because they acknowledge that circumstances change over long marriages. Unlike infidelity clauses, sunset clauses are regularly enforced because they address legitimate concerns about the evolving nature of marital partnerships.
Do I need a lawyer for an Alberta prenup?
Yes, Alberta is one of the few Canadian provinces that mandates independent legal advice for prenuptial agreements. Under Family Property Act, s. 38, each party must sign an acknowledgment before a lawyer who is not representing the other party. Without proper section 38 compliance, the prenup may be unenforceable. Each lawyer must sign a certificate confirming the acknowledgment was completed correctly, and these certificates must be attached to the agreement.
Author: Antonio G. Jimenez, Esq. Credentials: Florida Bar No. 21022 | Covering Alberta divorce law
This guide provides general legal information about infidelity clauses in Alberta prenuptial agreements as of May 2026. Laws change, and individual circumstances vary. Consult a licensed Alberta family law lawyer for advice specific to your situation. Filing fees and legal costs verified as of May 2026; confirm current amounts with the Court of King's Bench or your local registry.