Signing a prenuptial agreement and having one that actually holds up are two different things. Alberta courts will set aside an agreement that looks fine on paper if it was signed without proper disclosure, without independent advice, or under pressure. Enforceability isn't decided by the document alone. It's decided by how the agreement was reached.
A prenuptial agreement is enforceable in Alberta when both spouses gave full and honest financial disclosure, each received independent legal advice, the agreement was signed voluntarily and in writing, and its terms were fair both when signed and, for spousal support, when enforcement is sought. Missing any of these gives a court grounds to set the agreement aside.
An agreement built on incomplete information is vulnerable from the start. Each spouse needs to disclose their income, assets, debts, and significant financial interests, such as a business or an expected inheritance, before signing.
A prenuptial agreement in Calgary that leaves out a bank account, undervalues a business, or omits a debt gives a court a clear reason to set aside the terms affected by that omission. Disclosure has to be honest, not just technically provided.
One lawyer cannot advise both people signing the agreement. Each spouse needs their own lawyer, so each person understands their rights, what they're giving up, and what the agreement actually means for their future.
A court asked to enforce an agreement will look closely at whether both spouses had that advice, and an agreement signed without it is far easier to challenge. This is one of the main reasons couples work with a prenuptial agreement lawyer early, rather than trying to draft something themselves.
Alberta's Family Property Act sets out formal requirements for agreements between spouses about property. In practice, that means the agreement needs to be a written document, signed by both spouses, with each signature properly witnessed. An informal understanding, a verbal promise, or an unsigned draft doesn't meet the bar, no matter how clearly it was discussed beforehand.
Timing and circumstances matter as much as content. An agreement presented days before the wedding, with no real opportunity to review it, ask questions, or get advice, is much easier to challenge later.
Courts look at whether a spouse had a genuine, unhurried chance to consider the agreement and walk away if they wanted to. Starting the process months ahead, rather than the week of the wedding, protects the agreement as much as it protects the relationship.
A prenuptial agreement doesn't need to split everything equally, but it does need to be fair in the circumstances at the time it was made. An agreement that leaves one spouse with essentially nothing, or that was clearly one-sided given what each person brought to the marriage, is at greater risk of being set aside, especially where disclosure or advice was also lacking. Fairness at signing is assessed against what both spouses knew and agreed to at that point.
Property terms are generally assessed as of when they were signed. Spousal support terms are treated differently. Canadian courts apply a two-part test from the Supreme Court of Canada's decision in Miglin v. Miglin, which asks first whether the agreement was negotiated fairly, and second, whether it still reflects the parties' circumstances at the time enforcement is sought.
A support waiver that made sense for two working professionals can look very different years later if one spouse left the workforce to raise children. That gap is often where a support term is challenged.
Beyond the core requirements, a few specific problems commonly sink an agreement:
| Requirement | What It Means | Risk If Missing |
| Financial disclosure | Full, honest disclosure of income, assets, and debts | Terms affected by the omission may be set aside |
| Independent legal advice | Separate lawyer for each spouse | Agreement more easily challenged |
| Written and signed | Formal written document, properly signed | Agreement may not meet legal requirements |
| No duress | Genuine time to review and decide | Agreement seen as involuntary |
| Fair at signing | Reasonable terms given the circumstances at the time | Grounds to challenge as one-sided |
| Fair at enforcement (support) | Still reflects circumstances when enforcement is sought | Support terms may be reviewed under the Miglin test |
THEBIL Family Law structures the process around the requirements that actually hold up in court: full disclosure, independent advice, proper documentation, and fair terms negotiated with enough time. A prenuptial agreement in Calgary drafted this way is far more likely to be enforced if it's ever tested. THEBIL Family Law also advises on how a spousal support provision is likely to be viewed years down the line, not just on the day it's signed.
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Full financial disclosure, independent legal advice for each spouse, a properly written and signed agreement, no duress, and fair terms both when signed and, for spousal support, when enforcement is sought.
Yes. Leaving out assets, debts, or income gives a court grounds to set aside the terms affected by that omission.
Yes. One lawyer can't advise both spouses, and an agreement signed without independent advice is much easier to challenge.
Yes. Alberta's Family Property Act requires a written agreement, signed by both spouses.
Yes. Signing under time pressure, with no real chance to review or negotiate, supports an argument that the agreement wasn't voluntary.
Yes. Courts apply the Miglin test, which looks at whether the agreement was fair when made and whether it still fits the circumstances when enforcement is sought.
No. Courts retain authority over child support and parenting regardless of what the agreement says.
Yes. THEBIL Family Law builds agreements around full disclosure, independent advice, and fair terms so they're more likely to be enforced.
An enforceable prenuptial agreement in Calgary depends on how it's put together, not just what it says. THEBIL Family Law can guide you through the process the right way. Book a consultation to get started.
