A sunset clause in a British Columbia prenuptial agreement automatically terminates all or specific provisions of the contract after a predetermined period, typically ranging from 5 to 25 years of marriage. Under the Family Law Act, S.B.C. 2011, c. 25, marriage agreements (BC's legal term for prenups) remain enforceable indefinitely unless they contain express expiration language or a court sets them aside under Section 93 for significant unfairness. British Columbia courts will honor properly drafted sunset clauses that clearly specify the triggering event, whether a specific anniversary date, the birth of a child, or achievement of certain financial milestones.
| Key Facts | Details |
|---|---|
| Filing Fee (Divorce) | $210 CAD (Notice of Family Claim) + $80 CAD (Desk Order) |
| Residency Requirement | 1 year in British Columbia under Divorce Act, R.S.C. 1985, c. 3, s. 3(1) |
| Legal Framework | Family Law Act, S.B.C. 2011, c. 25, ss. 92-93 |
| Enforceability Standard | "Significant Unfairness" test |
| Agreement Type | Marriage Agreement (prenuptial) |
| Sunset Clause Status | Permitted but not required |
| Typical Sunset Period | 5 to 25 years |
| Average Prenup Cost | $2,500 to $7,000 CAD (both parties) |
What Is a Sunset Clause in a BC Prenuptial Agreement
A sunset clause is a contractual provision that causes a prenuptial agreement to expire automatically after a specified period of marriage, eliminating all or designated portions of the agreement without requiring court intervention or mutual consent. In British Columbia, sunset clauses most commonly terminate prenuptial agreements after 10 to 15 years, though parties can select any duration they negotiate. When a sunset clause activates, property division reverts to the default equal-sharing rules under Section 81 of the Family Law Act, which presumes family property is divided equally between spouses regardless of who holds title.
British Columbia's Family Law Act does not mandate sunset clauses, meaning couples may choose to include them or omit them entirely. The decision to incorporate a sunset clause should reflect the couple's specific circumstances, including wealth disparity, age difference, and whether either party is entering a second marriage with existing children. Sunset clauses provide time-limited protection that acknowledges how contributions and circumstances evolve over a long marriage.
The three most common sunset clause structures in BC marriage agreements include:
- Full termination clauses that void the entire agreement after a specified anniversary (commonly 10, 15, or 20 years)
- Partial phase-out clauses that gradually reduce protected assets by a percentage each year (for example, 10% per year after year 5)
- Event-triggered clauses that expire upon specific milestones such as the birth of a first child or reaching a combined net worth threshold
How British Columbia Law Treats Marriage Agreements
British Columbia courts enforce marriage agreements that comply with the requirements of Sections 92 and 93 of the Family Law Act, applying a significant unfairness standard rather than the unconscionability test used in other Canadian provinces. Under Section 92, spouses may contract out of the default property division rules, creating binding arrangements for both family property and family debt. Section 93 establishes the court's authority to set aside these agreements under specific circumstances, creating a two-pronged test examining both procedural fairness at formation and substantive fairness at the time of challenge.
The Family Law Act Section 93(3) permits courts to set aside marriage agreements when:
- A spouse failed to disclose significant property, debts, or liabilities existing at agreement formation
- A spouse took improper advantage of the other spouse's vulnerability due to ignorance, need, or distress
- A spouse did not understand the nature or consequences of the agreement
- Other circumstances making enforcement of the agreement significantly unfair
Even when none of these formation defects exist, Section 93(5) grants courts discretion to set aside agreements that have become significantly unfair over time. This provision directly affects sunset clauses because it means BC courts will examine whether the absence of a sunset clause (or an unreasonably long duration) creates significant unfairness given changed circumstances.
The Significant Unfairness Standard and Sunset Clauses
British Columbia's significant unfairness standard, established in L.G. v. R.G., 2013 BCSC 983, requires demonstrating compelling or meaningful unfairness before courts will intervene in a marriage agreement. In Remmem v. Remmem, 2014 BCSC 1552, the BC Supreme Court clarified that significant unfairness exceeds mere unfairness and must be assessed against three statutory factors under Section 93(5): the length of time since the agreement was made, the parties' intention to achieve certainty, and the degree to which spouses relied on the agreement's terms.
The BC Court of Appeal's decision in Schrader v. Schrader, 2025 BCCA 50 confirmed that these three factors do not conclusively determine significant unfairness but serve as considerations when deciding whether an unfair agreement should be set aside. This ruling has particular relevance for sunset clauses because it means courts will consider whether the parties intended the agreement to provide certainty for a defined period and whether that intention should be honored.
Sunset clauses can protect against significant unfairness claims by ensuring agreements do not indefinitely bind parties to arrangements that become grossly imbalanced over decades of marriage. An agreement without a sunset clause that was fair when signed in 2010 may face challenge under Section 93(5) if circumstances have changed dramatically by 2026.
Common Sunset Clause Structures in BC Prenups
British Columbia family lawyers typically draft sunset clauses using one of four structural approaches, each with distinct advantages depending on the couple's priorities and risk tolerance. The table below compares these approaches based on their characteristics, typical applications, and potential enforceability concerns under the Family Law Act.
| Sunset Type | Duration | Trigger | Typical Use Case | Enforceability Risk |
|---|---|---|---|---|
| Fixed Anniversary | 10-25 years | Reaching specified anniversary while still married | Long-term wealth protection | Low if clearly drafted |
| Graduated Phase-Out | 5-15 years | Annual percentage reduction | Balancing protection with fairness | Medium - complexity issues |
| Milestone-Based | Variable | Birth of child, retirement, or net worth threshold | Entrepreneurs, second marriages | Medium - ambiguity risk |
| Hybrid | Combined | Multiple triggers with fallback dates | Complex estates | Higher - interpretation disputes |
The fixed anniversary sunset clause remains the most straightforward to draft and enforce in BC courts. This approach specifies that upon reaching a designated wedding anniversary while still legally married, the entire agreement terminates automatically. For example, a clause stating "This agreement shall terminate in its entirety upon the parties reaching their fifteenth wedding anniversary while remaining legally married" provides clear, unambiguous language that BC courts can readily interpret.
Graduated phase-out clauses reduce the protected percentage annually, creating a sliding scale. A typical structure might protect 100% of premarital assets for the first 5 years, then reduce protection by 10% annually until reaching 0% at year 15. These clauses require precise mathematical language and clear definitions of what constitutes the protected asset base.
Milestone-based sunset clauses tie termination to specific events rather than dates. Common milestones include the birth of a first child, one spouse reaching age 65, combined retirement, or achieving a specified net worth. These clauses face higher enforceability risk because the milestone may never occur or may be subject to interpretation disputes.
Drafting an Enforceable Sunset Clause in British Columbia
Drafting a sunset clause that will survive judicial scrutiny under the Family Law Act requires precise language, thorough financial disclosure, and ideally, independent legal advice for both parties. The average cost for a comprehensive prenuptial agreement with sunset provisions in British Columbia ranges from $2,500 to $7,000 CAD for both parties combined as of 2026, with simple agreements starting at approximately $1,500 CAD per spouse and complex agreements involving business interests or international assets exceeding $5,000 CAD per spouse.
Essential elements for an enforceable sunset clause include:
- Unambiguous trigger language specifying exactly when the sunset occurs (date, anniversary, or event)
- Clear statement of which provisions terminate and which remain in effect
- Explicit acknowledgment that both parties understand the sunset clause implications
- Full financial disclosure schedules attached to the agreement
- Independent legal advice certificates from each party's separate BC family lawyer
- Signatures witnessed as required under Section 93(1) of the Family Law Act
BC family lawyers recommend including a contemplation clause stating that both parties have considered the long-term implications of the sunset clause and voluntarily agree to its terms. This language helps demonstrate that neither party was under duress or failed to understand the agreement's consequences, addressing two of the four grounds for setting aside agreements under Section 93(3).
Review Clauses as an Alternative to Sunset Clauses
A review clause differs from a sunset clause by requiring periodic renegotiation rather than automatic termination, giving couples the opportunity to update their agreement without completely abandoning its protections. BC family lawyers often recommend review clauses as a more flexible alternative that preserves the agreement's core structure while allowing adaptation to changed circumstances. Review clauses typically trigger every 5 to 7 years or upon significant life events such as the birth of a child, substantial inheritance, or career change.
The advantage of review clauses over sunset clauses is that they maintain the agreement's existence while providing a structured opportunity for modification. If the parties cannot agree on revisions during a review period, the original terms remain in effect until the next review date or until a court determines the agreement has become significantly unfair under Section 93(5).
YLaw, a British Columbia family law firm, recommends including review clauses that give parties a chance to make revisions periodically, particularly for agreements that will span many years. However, the firm notes that parties should only include review clauses if they actually intend to conduct reviews, as an ignored review clause may not provide meaningful protection against significant unfairness claims.
What Happens When a Sunset Clause Expires in BC
When a sunset clause activates in British Columbia, the terminated provisions lose their legal effect and property division defaults to the equal-sharing presumption under Section 81 of the Family Law Act. Family property acquired during the marriage becomes subject to equal division regardless of title, and excluded property protections established in the prenuptial agreement no longer apply. This transition can have substantial financial consequences, particularly for spouses who accumulated significant wealth during the marriage.
The expiration of a sunset clause does not retroactively affect property divisions that occurred before the expiration date. If the agreement included provisions for dealing with property during the marriage (such as maintaining separate bank accounts), those historical arrangements remain valid. However, any property existing at the time of eventual separation will be divided according to the Family Law Act's default rules unless the parties enter a new agreement.
Connecticut case law, while not binding in British Columbia, provides instructive guidance on sunset clause interpretation. In a notable Connecticut case, a prenuptial agreement stated it would expire if the couple was still married on their seventh anniversary. The husband filed for divorce four months before the anniversary, but the couple remained legally married on the anniversary date. The court ruled that because they were married on their seventh anniversary, the sunset clause activated and the prenup expired, requiring property division under state default rules.
Cohabitation Agreements and Sunset Clauses
British Columbia's Family Law Act treats cohabitation agreements similarly to marriage agreements, meaning sunset clauses can be included in agreements made by common-law spouses. Under BC law, common-law relationships receive equivalent property division treatment to marriages after two years of cohabitation, making cohabitation agreements with sunset clauses a valuable planning tool for unmarried couples.
A unique feature of BC cohabitation agreements is automatic conversion to marriage agreements upon the couple's subsequent marriage. A well-drafted cohabitation agreement from a BC family lawyer will typically contain a contemplation of marriage clause stating that if the parties marry, the contract automatically becomes a binding marriage agreement without requiring new signatures. This conversion preserves any sunset clauses contained in the original cohabitation agreement.
The automatic conversion feature means couples should consider whether sunset clause duration in a cohabitation agreement should run from the date of cohabitation or reset upon marriage. An agreement signed after three years of cohabitation with a 10-year sunset clause might expire just seven years after marriage if the clock started at signing rather than at the wedding date. Precise drafting should address this timing issue explicitly.
Challenging a Prenup with an Expired Sunset Clause
When a sunset clause has expired, a spouse seeking to enforce the original prenuptial terms faces an extremely difficult legal position in British Columbia courts. The expiration language operates automatically, meaning the agreement terminates by its own terms without requiring any court order or mutual consent. Attempting to argue that an expired sunset clause should be ignored typically requires demonstrating drafting error, mutual mistake, or that the sunset clause itself was procured through improper means.
Conversely, if one spouse argues the sunset clause has not yet expired while the other claims it has, BC courts will interpret the clause according to standard contract interpretation principles. Courts examine the ordinary meaning of the words used, the commercial context, and the parties' apparent intentions when they signed the agreement. Ambiguous sunset clauses may be interpreted against the party who drafted them under the contra proferentem rule.
The costs of litigation to dispute a sunset clause's application can be substantial. BC Supreme Court filing fees total approximately $290 to $330 CAD (including the $210 Notice of Family Claim and $80 desk order requisition as of June 2026), but legal fees for contested family law proceedings typically range from $15,000 to $50,000 CAD or more depending on complexity. Couples considering sunset clauses should weigh these potential litigation costs against the benefits of clear, unambiguous language.
Should You Include a Sunset Clause in Your BC Prenup
The decision to include a sunset clause prenup British Columbia depends on several factors including the wealth disparity between spouses, the age of both parties, whether either has children from prior relationships, and how each party views the marriage's expected longevity. Sunset clauses make the most sense when one party enters marriage with substantially greater wealth but both parties expect their financial contributions to equalize over time.
Situations where sunset clauses are commonly appropriate:
- Second or subsequent marriages where one spouse has significant premarital assets but wants to reward marital contribution over time
- Marriages with substantial age differences where the younger spouse may contribute more earning years
- Situations where one spouse will sacrifice career advancement for family responsibilities
- Couples who want protection for a defined period but expect full financial integration eventually
Situations where sunset clauses may be inappropriate:
- Marriages where both parties have roughly equal assets and earning potential
- Family business protection where ongoing separation of business interests is critical
- Second marriages later in life with adult children and clear inheritance planning goals
- Situations where one spouse requires permanent protection of inherited family wealth
The Family Law Act's significant unfairness standard provides some protection against agreements that become grossly imbalanced over time even without a sunset clause. However, relying on court intervention creates uncertainty and litigation risk that a properly drafted sunset clause can avoid.
H2 FAQs: Sunset Clauses in BC Prenuptial Agreements
How long do prenuptial agreements last in British Columbia without a sunset clause?
Prenuptial agreements in British Columbia remain in effect indefinitely until the parties divorce, one party dies, or a court sets aside the agreement under Section 93 of the Family Law Act. Without a sunset clause, the agreement continues to govern property division regardless of how many years the marriage lasts, though courts may set aside agreements that become significantly unfair over time.
Can I add a sunset clause to an existing prenuptial agreement in BC?
Yes, spouses can amend an existing marriage agreement to add a sunset clause through a written amendment signed by both parties, ideally with each spouse obtaining independent legal advice. The amendment should clearly specify which provisions will be affected by the sunset clause and when the termination will occur. Amendment costs typically range from $1,500 to $3,500 CAD for a comprehensive modification.
What is the most common sunset clause duration in British Columbia prenups?
The most common sunset clause duration in British Columbia marriage agreements ranges from 10 to 15 years, though durations vary significantly based on circumstances. Some couples choose shorter 5 to 7 year periods when they expect rapid financial equalization, while others select 20 to 25 years for longer-term wealth protection. There is no legally mandated minimum or maximum duration.
Does a sunset clause automatically void the entire prenuptial agreement?
A sunset clause can be drafted to terminate the entire prenuptial agreement or only specific provisions while leaving others intact. For example, a sunset clause might terminate spousal support waivers after 15 years while preserving excluded property protections permanently. The specific language of the sunset clause determines its scope, making precise drafting essential.
How does British Columbia's significant unfairness test affect sunset clauses?
BC's significant unfairness test under Section 93(5) of the Family Law Act can work both for and against sunset clauses. A sunset clause may help prevent significant unfairness claims by ensuring agreements do not bind parties indefinitely to outdated arrangements. Conversely, if a sunset clause itself creates significant unfairness (such as by expiring immediately before a spouse would receive needed support), courts may consider that factor in their overall fairness assessment.
What happens if my spouse files for divorce just before the sunset clause expires?
If divorce proceedings commence before a sunset clause's expiration date, British Columbia courts will apply the agreement as it existed when the marriage ended, meaning the prenuptial protections would still apply. However, if the sunset clause specifies the parties must be "married on" a certain anniversary (rather than remaining married until that date), and that anniversary occurs during the divorce proceedings while still legally married, the clause may activate despite the pending divorce.
Can a sunset clause be contested in British Columbia court?
Yes, a sunset clause can be contested on the same grounds as any marriage agreement provision under Section 93 of the Family Law Act. Grounds include failure to disclose financial information, taking improper advantage of vulnerability, failure to understand the agreement, or other circumstances making enforcement significantly unfair. Litigation costs for contested family proceedings typically range from $15,000 to $50,000 CAD or more.
Do I need a lawyer to include a sunset clause in my BC prenup?
While BC law does not legally require independent legal advice for marriage agreements, having separate lawyers for each spouse significantly increases enforceability and reduces the risk of court intervention under Section 93. BC family lawyers strongly recommend ILA, especially for agreements containing sunset clauses where the long-term implications may not be immediately apparent to parties without legal training.
What is the difference between a sunset clause and a review clause in BC?
A sunset clause automatically terminates agreement provisions after a specified period, while a review clause requires periodic renegotiation without terminating the agreement. Sunset clauses provide certainty that protections will end at a specific time, while review clauses maintain flexibility but require ongoing cooperation between spouses to implement changes. Review clauses are typically triggered every 5 to 7 years.
Can a sunset clause apply to parenting arrangements in British Columbia?
No, sunset clauses cannot bind courts regarding parenting arrangements in British Columbia because decisions about children must always be made in the child's best interests at the time of determination under the Family Law Act and the Divorce Act. Any prenuptial provisions purporting to predetermine parenting time or decision-making responsibility are unenforceable and will be disregarded by BC courts.