Investment losses during marriage are typically shared between spouses just like gains would be.

Market fluctuations affect LIRA values and if your account has decreased in value during your marriage, that reduced value is the basis for division calculations. Both investment gains and losses during the marriage period are shared between spouses according to provincial family law formulas. This means your spouse shares not only in the growth of your investments but also in any declines. The actual separation date value, not a historical high value, is what courts generally consider when determining the matrimonial portion to be divided.