Allowable costs on windfall CGT

You are allowed deduct buying, holding, and selling costs when calculating capital gains tax.

If I receive a capital payment as a result of shares held in a mutual society, and a condition of receiving that payment is that I maintain a minimum balance of funds with the mutual society, could the following be allowed as holding costs:

1. The amount of interest I could have received if I were able to put the minimum balance on deposit elsewhere.

2. The amount by which inflation has eroded the minimum balance since I first placed it with the mutual society.

J.

No and no.

1. Is an opportunity cost
2. In the case of inflation, indexation was allowed to compensate for this, but has since been abolished. It may be allowed for a portion of the holding period.