15 Severance is the conversion of a joint tenancy into a tenancy in common. Professor Butt observed in his work, Land Law, 5th ed, 2006, p 237 at [1458]:
"Strictly speaking, joint tenants do not have proportionate shares in the land. It might therefore be asked how a joint tenant can convert his or her "interest" into a proportionate share in the property as tenant in common. But for the purpose of severance this logical conundrum is ignored, and a joint tenant is regarded as having a potential share in the land commensurate with that of the other joint tenants. Where there are two joint tenants, that potential share is one-half; where there are three joint tenants, it is one-third; and so on. This potential share the joint tenant can deal with unilaterally during his or her lifetime. By so dealing with it, that share may be "severed" from the other shares and converted into an "aliquot" undivided share held in common, not jointly."
16 The cross-claimant's argument that Cummins v Cummins can be distinguished on the facts is to be accepted. A particular distinction is that the August 1987 transaction by Mr Cummins effected a severance. In the present case, as the property was Torrens title land, the fraudulently executed mortgage did not sever the joint tenancy: Lyons v Lyons [1967] VR 169; s 57 of the Real Property Act. The methods by which severance may be effected are well established and no other dealings by Mr Van den Heuvel had been registered which severed the joint tenancy. If such a dealing had been lodged, the Registrar General was required to notify the cross-claimant: s 97(5) of the Real Property Act. There is, in my opinion, no room in the present case for severance by implication.
17 Severance, however, may be effected by court order. The following remarks by Professor Butt in Land Law at [1487] are in point:
" A court has no inherent jurisdiction to sever a joint tenancy on the unilateral application of one of the joint tenants, unless the order confirms a severance that has already occurred under one of the grounds already discussed.
However, a joint tenancy may be severed as a result of a court order that requires the property to be dealt with in a manner that expressly or by necessary implication is inconsistent with continuance of the joint tenancy."
18 The judgment granting possession to the plaintiff of the whole of the property is an order that requires the property to be dealt with in a manner inconsistent with the continuance of the joint tenancy. As a result of the order, the joint tenancy will be severed. No evidence has been led by the cross-claimant that she and her husband contributed to the purchase in unequal shares. The cross-claimant is to be regarded as having a one-half beneficial interest in the property.
19 The measure of damage under s 129 of the Real Property Act is such as will put the cross-claimant in the same position so far as money can do it, as if the wrongful act had not been done, but not in a better position: Registrar of Titles v Spencer (1909) 9 CLR 641. Her entitlement to payment from the Torrens Assurance Fund is not measured by an interest in the whole of the property. Mrs Van den Heuvel is entitled to an unencumbered one-half share in the property. Her loss is the difference between the value of her unencumbered one-half share and the sum that she will actually receive (if any) after payment of the plaintiff's mortgage. In the result, the cross-claimant will so far as money can do it gain the equivalent of all she has lost as a result of her husband's fraud.
20 It seemed to me from the outset that the argument advanced for the cross-claimant was flawed. The interest of a joint tenant is not the same as a sole registered proprietor. Payment by the Registrar General of the whole amount outstanding on the mortgage would do more than compensate the cross-claimant for her loss. I do not accept that the measure of damage is the amount required to discharge the mortgage.