What are the tax implications when we sell the family home after separating in Ontario?

A sale of the matrimonial home following separation can raise both family law and tax issues. On the tax side, the principal residence exemption is the central question: if the home was your principal residence for all the years of ownership, the entire capital gain is sheltered from tax, regardless of whether the sale happens during the marriage, after separation, or after divorce.

If only one spouse continues to live in the home after separation while the other has moved out, both spouses can still designate the home as their principal residence for the years of the marriage because the exemption covers years in which the property was inhabited by the owner or their spouse. The year of separation gets careful treatment: even after spouses are separated, the family unit designation rules may still allow both to benefit from the exemption for the year of separation, depending on marital status at year-end.

If the departing spouse had no other property in their name during the period of separation, they may still be entitled to designate the matrimonial home for the years they did not physically live there, which can preserve the exemption. The interaction between the designation rules and the "family unit" definition for years before and after separation requires careful analysis by a tax professional.