mattwnz:
We are talking about houses/property that rise in value over time, which are essentially assets. Most things that are sold on trademe lose value, and are consumables, and I am sure the government would want to refund taxes on their loss. eg loss in value of a car.
When you own an investment property, the goal is to make money on the sale/use of the property - the financial gain is income, that is not the case for most home owners, whose house's rise in value with the rest of the neighbourhood, or individually because of other reasons like improvements and when selling the value is used to help pay for their next family home.
I think a capital gains tax would be suitable only for 'investment properties' and include holiday homes if the capital gain is 10% higher than current property valuation - with a clause that classifies a holiday home as a home that does not receive any income from rental/temp lease.
I've said enough but I disagree with any tax on the sale of personal property that isn't a traditional investment for gaining income.