Background
John and Maria Proust separated in December 2021 after a 29-year marriage. John had been the sole income earner, providing management services to junior mining companies through two personal corporations; Maria had been a stay-at-home parent and only began working as a realtor in 2020. Following litigation, the parties reached a financial settlement on July 1, 2023, under which John agreed to pay $18,500 per month in spousal support. Between July and December 2023 the parties exchanged drafts and continued negotiating ancillary terms. In November 2023, John’s counsel notified Maria’s counsel without prejudice that his projected 2024 income had fallen to approximately $267,000 and sought to renegotiate support. Maria refused to lower the monthly amount but agreed to reduce the income threshold triggering a material change from $600,000 to $300,000. The parties signed the separation agreement in December 2023, expressly declaring its effective date to be July 1, 2023.
The agreement permitted either party to apply for variation upon “a material change in the financial circumstances of either of them” (clause 46) and enumerated specific triggering events, including John’s income exceeding $300,000 per year (clause 48(b)). By 2024, two of the mining companies John managed had effectively ceased operations — Rise Gold Corp was denied a mine-use permit in February 2024 and Southern Arc Minerals ran out of money — eliminating significant management fees. John missed his June 2024 payment and reduced payments to $9,000 per month, accumulating $104,000 in arrears. In August 2024 he applied to reduce support to $7,328 per month based on a guideline income of $276,000.
The chambers judge dismissed the application after applying the two-stage framework from Miglin v. Miglin, 2003 SCC 24. Using December 2023 (the execution date) as the baseline, the judge found the parties had already contemplated a drop in John’s income — as evidenced by the November 2023 without-prejudice correspondence and the lowered material-change threshold — and that his actual 2024 income of approximately $276,000 (only about $24,000 below the $300,000 threshold) did not amount to a material change not foreseen at the time the agreement was formed.
The Court’s Holding
A unanimous panel (Brundrett J.A., Dickson and Winteringham JJ.A. concurring) allowed the appeal. The court held that the chambers judge erred in law by measuring changed circumstances from the December 2023 execution date rather than the July 1, 2023 effective date that the parties themselves had designated as the operative baseline of their agreement. Because the agreement expressly stated it was entered into “to formalize” a settlement already reached on July 1, 2023, the effective date — not the signing date — was the proper reference point for the material-change analysis.
Assessed from the correct baseline, John’s income at the time of settlement was estimated at $433,583 for 2023, and his actual 2024 income fell to approximately $276,000 — a drop of roughly $157,000. That decline, driven by the concrete collapse of two client companies after the effective date, constituted a substantial and continuing change that, if known at the time of settlement, would likely have resulted in different support terms. The court therefore found the chambers judge had committed a reviewable error in failing to identify this as a material change in circumstances.
On the without-prejudice correspondence issue, the court upheld its admission. Because John’s own application put in issue what the parties actually contemplated about his future finances when they contracted, his November 2023 prediction of reduced income was relevant and necessary to resolve that question, satisfying the exception to settlement privilege recognized in Dos Santos v. Sun Life Assurance Co. of Canada, 2005 BCCA 4. The court did not fix a new quantum of support, instead remitting the matter to the Supreme Court of British Columbia for further consideration of the appropriate level of spousal support.
Key Takeaways
- When a separation agreement specifies a retroactive effective date, that date — not the date of execution — is the proper baseline from which to measure a material change in financial circumstances for spousal support variation purposes.
- Without-prejudice communications become admissible as an exception to settlement privilege when the applicant directly puts in issue the parties’ state of knowledge or contemplation at the time the agreement was formed.
- Under the Miglin framework applied to a s. 15.2 Divorce Act application, a court must look beyond the four corners of the agreement and conduct a comprehensive analysis; choosing the wrong reference date for the material-change inquiry is an error in principle warranting appellate intervention.
- A significant income drop caused by post-agreement events — such as a client company losing an operating permit or becoming insolvent — can qualify as a material change even where some income decline was broadly anticipated, provided the magnitude of the change was not actually contemplated at the relevant baseline date.
Why It Matters
This decision provides important practical guidance for family lawyers drafting and litigating separation agreements that are backdated to an earlier settlement date. The court makes clear that the choice of effective date carries substantive legal weight: it anchors the material-change inquiry and determines what income levels and circumstances are treated as the agreed-upon baseline. Practitioners should therefore draft effective-date clauses with precision, and carefully consider what financial information existed as of that date versus the signing date, since the gap between the two can be outcome-determinative in subsequent variation proceedings.
More broadly, the case reinforces that courts applying s. 15.2 of the Divorce Act must rigorously situate the material-change analysis at the correct point in time, even when the parties’ negotiating history spans many months. Conflating a retroactive effective date with the execution date risks systematically undervaluing changes in circumstances that occurred between settlement and formalization — a period that, as this case illustrates, can be precisely when significant financial developments first emerge.