joint estate is £30,000, SO that the value of the half interest is
£15,000, and if the value of the separate estate is £20,000, then the amount by which the primary taxpayer's assessment is increased is the difference between 10,000* (1 + 10,000 30,000 d., or 13,333d., and 25,000+ (1+ 30,000) d., or 45,333d., i.e., 32,000d., the share attributable to each joint interest being 22,666d. In the same case, the amount by which the secondary taxpayer's assess- ment is increased is the difference between 15,000** (1+10,00) or 22,500d. and 30,000++ (1+30,000) d., or 60,000d., i.e. 37,500d. The share attributable to the joint interest in this case is 3/7 of 60,000d., or 25,714d., which is less than 32,000d., the prescribed amount of deduction under the general rule of sec. 43. In this case the proviso does not come into operation at all, and if the Commissioner's contention is accepted, the rule itself is to be dis- regarded.
In the case where a trustee is the primary taxpayer in respect of a trust estate which is not also a joint estate, the amount by which the primary taxpayer's assessment is increased by the inclusion of the secondary taxpayer's interest in his assessment is always less than that by which the secondary taxpayer's assess- ment is increased by the inclusion of that interest in his assess- ment, unless the secondary taxpayer has no other land, in which case the amounts are equal, SO that the first proviso to sec. 43 in this case does not come into operation.
In the case of joint estates (whether held on trust or not) the amount by which the primary taxpayer's assessment is increased by the inclusion of a secondary taxpayer's interest may, as I have shown, be less than, equal to, or greater than, the amount by which the secondary taxpayer's assessment is increased by the inclusion of that interest in his assessment. In the first two cases the proviso has no operation. In the third it applies, whatever its effect may be.
The cases of mortgagees (sec. 32) and unpaid vendors (sec. 37) are practically governed by the same conditions as the case of joint estates.
* i.e. half of £30,000-£5000. + i.e. £30,000-£5000.
++ i.e. £20,000+£15,000-£5000.