Under s 20, the sole consideration of the court in adjusting the interests of the parties in their property is the justice and equity of the case, having regard to the contributions that fall into the category of those described in ss 20(1)(a) and (b). Under the erosion principle, on the other hand, the inquiry commences with a determination whether an initial contribution by one party has been made and this is followed by a consideration as to whether that contribution was eroded by later contributions of the other party. On this basis there appears to be an onus on the other party to prove that the initial contribution should be eroded. This approach is contrary to s 20.
56 I would add that the erosion principle, if adopted, would tend - in the same way - to affect the onus in regard to other property assets acquired by a party at a later time in the relationship. Consistently with that principle, it might be said that, once a property is registered in the name of one party, that party should be entitled to the full value of that property at the date the relationship is terminated unless it can be shown that his or her right to that property was eroded by the contributions of the other party. That would plainly be inconsistent with the express words of s 20.
57 In Burgess v King [2005] NSWCA 396 Hodgson JA (with whom Mason P and Campbell AJA agreed) gave the principal judgment of the Court in another matter under the Property (Relationships) Act. The respondent in that case had a 50 per cent interest in her former home at Diggers Avenue, Gladesville. At the commencement of the relationship that interest was worth $120,000 less a $20,000 mortgage. A year after the relationship commenced the respondent purchased the other 50 per cent interest in the Diggers Avenue property for $50,000. The value of the Diggers Avenue property at the time of the hearing was $780,000. The appellant had undertaken renovations to the property worth about $120,000. The primary judge found that the capital increase in the value of the Diggers Road property, apart from any increase in value due to the renovations, was about $420,000. Hodgson JA said that, prima facie, it would be just and equitable that the appellant participate in the $420,000 increase to the extent of about $100,000. Because of other factors in favour of the respondent that the primary judge did not take into account, Hodgson JA concluded that the appellant be awarded an additional sum of $50,000 representing his participation in the $420,000 capital value increase.
58 Nothing in Burgess v King is inconsistent with Howlett v Nielson. The facts in the two cases were different and the claims made by the respective parties in each case were also different. Hodgson JA did not refer to Howlett v Nielson in his reasons in Burgess v King and there was no reason whatever for him to do so. Nothing in Burgess v King detracts from the views his Honour expressed in Howlett v Nielson with regard to the approach to be adopted in relation to the evaluation of contributions and the determination of adjusting orders under s 20.
59 In Kardos v Sarbutt Brereton J said at [59] that in Howlett v Nielson Hodgson JA was not "purporting to state a rule of general application". If all his Honour meant was that Hodgson JA was not intending to suggest that a 50 per cent apportionment of the increase in value of the assets was of general application then I agree entirely. In fact, Hodgson JA made it plain that this was simply the order that was appropriate in the particular circumstances. But, in Howlett v Nielson, Hodgson JA did state rules of general application, namely those that I have set out above in regard to the evaluation of contributions, generally.
60 Brereton J went on to say in [61]:
"The approach which was adopted in Burgess v King is one which gives due weight to the time value of money, and recognises that capital gains are the product of the initial introduction of the property, rather than of ongoing contributions. On the other hand, the approach adopted in Howlett v Neilson , in my respectful opinion, may, in at least some cases, result in the serious undervaluation of initial contributions. It treats any increment in capital value of an asset held at the outset of the relationship as if it were part of the fruits of the relationship, when it is not: it is the result of the asset having been held by one of the parties at the commencement of the relationship, and not the result of joint efforts of wage earning, homemaking and parenting, and mutual support of the type described by Deane J as producing 'fruits of the relationship'. It disregards the 'time value of money'. It is likely to produce erratic results, because under it the significance of any particular asset in the ultimate evaluation will depend on its value when it was introduced. If one party has a house worth $250,000 at the outset, and it appreciates during the relationship to be worth $750,000, the contribution is of a house which at separation is worth $750,000 - not of money worth $250,000."
61 Brereton J expressed the opinion that in at least some cases Howlett v Neilson may result in "serious undervaluation of initial contributions". He went on to comment on the approach in Howlett v Neilson in a way that could be construed as a departure from the views expressed by Hodgson JA.
62 By "the approach adopted in Howlett v Neilson" Brereton J appears to have meant the apportionment of the increase in value of the assets initially contributed. His Honour appears to have stated a rule to the effect that, for the purposes of determining what order should be made under s 20(1) of the Property (Relationships) Act, any increase in value in assets initially contributed should be regarded, in all circumstances, as entirely a contribution by the party who contributed those assets. If that is what his Honour intended, I do not agree.
63 Determinations as to what orders should be made under s 20 are to be made solely on the grounds of the justice and equity of the case. The justice and equity of the case may derive from the fact that the party who owns the family home or other property was able to retain that property, while the market value increased, because "of joint efforts of wage earning, homemaking and parenting, and mutual support". In some instances the non-financial contributions of one party may result in property of the kind in question not having to be sold. In other instances, the non-financial contributions of one partner may allow the other to advance his or her career and earn a high income that enables the property in question to be maintained and retained. Thus, an increment in capital value may well result, indirectly, from "joint efforts of wage earning, homemaking and parenting, and mutual support".
64 The contributions of one party to the home and to the family that allow the breadwinner to be free "to earn income, purchase property and pay off the mortgage" were expressly recognised in In the Marriage of Rolfe (1977) 25 ALR 217 at 219 at 219 (which in this respect was approved in Mallet v Mallet (1984) 156 CLR 605 at 635 to 636 per Wilson J.)
65 The comments I have made apply equally to a determination that gives one party, who contributes less financially than the other, a substantial proportion of the value of the pool of assets as at the date of the hearing.
66 If the principles expressed by Hodgson JA in Howlett v Nielson are correctly applied, the results would not be erratic and the ultimate evaluation would not depend on the value of the asset when it was introduced. If the evaluation is carried out correctly, and solely on the justice and equity of the case, the contribution in respect of the asset in question and the non-financial contributions will be weighed up and an appropriate adjusting order should then follow.
67 Thus, it is not necessarily the case that, "if one party has a house worth $250,000 at the outset, and it appreciates during the relationship to be worth $750,000, the contribution is of a house which at separation is worth $750,000 - not of money worth $250,000." There may be many reasons why, at separation, the party who contributed the house worth $250,000 was able to retain the house during the relationship (and, perhaps, earn money by pursuing some professional or business occupation as well). One obvious reason might be non-financial support that provides the domestic platform enabling the owner of the house to earn sufficient income to service the cost of the house. There are other non-financial contributions that a party may make which enable the owner of a house to retain the property while the relationship endures.
68 In Kardos v Sarbutt at [64] to [66] Brereton J accepted the "erosion principle", regarding it as "part of the methodology for weighing and balancing the different contributions" when weighing the initial contributions with all other relevant contributions. There are dangers in elevating a process of reasoning to the status of a principle, and for the reasons I have given I consider it preferable that the erosion principle (as a rule) should play no part in a determination under s 20.
69 Coming to a different point entirely, I would add, as a general proposition, that, where the primary income earner has professional or business talents which have enabled him or her to acquire valuable investment or business assets in a way that has little or nothing to do with the contributions of the other party to the relationship, it is likely that no adjusting order would be made in respect of those assets. That is simply because it is likely that the justice and equity of the case would require such a result.