The sale of shares acquired by means of an option exercise could give rise to a recoverable capital gains tax loss, according to the UK office of international professional services firm Deloitte.

The sale of shares acquired by means of an option exercise could give rise to a recoverable capital gains tax loss, according to the

UK office of international professional services firm Deloitte.

Paula Higgleton, head of the private clients practice at Deloitte, said: "While the tax case of Mansworth v Jelley in 2002 prompted a law change in respect of options exercised on or after
10 April 2003, in some cases the losses can still be claimed back and action may be necessary before
31 January 2009. The case was complex and the effect is best illustrated by an example."

Suppose Mr A, a company executive, was granted options in an unapproved scheme to acquire shares in X plc for £6 per share. When the options were exercised the shares were worth £10 per share and so Mr A had a gain of £4 per share on which he would have needed to pay income tax. When the shares were sold, further gains would be subject to capital gains tax. For many years it was thought that the starting point for the CGT calculation (the base cost) was the value on exercise, i.e. £10, so that a sale on the date of exercise would mean no further CGT to pay.

Ms Higgleton explains: "The surprising judgement in the Mansworth v Jelley case was that the base cost should actually be increased by the amount subject to income tax, increasing it in this example to £14 per share.  This would mean that a sale on the date of exercise would give a capital loss of £4 per share.  Shortly after the judgement, the law was changed back to what had previously been understood, in other words to give a base cost in this example of £10."

Although the case was in 2002, the implications remain where options were exercised before
10 April 2003, as follows.

If the shares have already been sold, it is worth checking that the correct base cost has been used in the calculation, so that any losses available have been claimed. The time limit for doing this for losses made in 2002/03 is
31 January 2009, so early action is recommended. If gains have been made since the loss arose, then a tax repayment may be available.

Losses for years up to 1995/96 can still be claimed, as no time limits apply to these years and if the shares are still held, again the records should be checked to make sure that the base cost is correct, i.e. it has been uplifted to reflect the amount subject to income tax on exercise, so that the correct tax is paid on a later sale.

Ms Higgleton added: "The rules in this area are complicated and not that well understood. Taxpayers may find that time spent in checking their records can give a significant tax saving."