Wasting Chattel - example a car - no cgt will arise on any gain
Wasting Asset - a cgt liability may arise. Not a chattel obviously. Example an option to buy a premises within 10 yrs for 10K. If individual sells option after 4 yrs his allowable cost is 6K. He has enjoyed the benefit of the first 4 yrs and this period and expenditure is now wasted.