What is the legal set-off under what circumstances can a husband set off against his wife's debts?

Ontario, Canada

The following excerpt is from Marketing Products Inc. v. 1254719 Ontario Ltd., 2000 CanLII 17001 (ON CA):

Legal set-off has several conditions. Both obligations must be debts and the debts must be mutual obligations. Moreover, the debts must be either liquidated sums or money demands which can be ascertained with certainty: see Telford v. Holt, 1987 CanLII 18 (SCC), [1987] 2 S.C.R. 193.

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