How pay tax on foreign shares just sold

Hi, I have held for many years IBM shares which were given to me by IBM (my employer) as part of my remuneration (bonuses, etc.). I recently decided to sell them all to simplify my accounts. The last time I sold IBM shares (probably 20 years ago) there was 40% withheld by a UK/USA tax agreement and I was advised that it was not necessary to take any further action to pay tax in the UK. This time, however, the proceeds arrived in my bank account without any deduction. So the questions I have are: * What tax do I owe on the proceeds? * How do I pay that tax to HMRC? I currently do not have to fill in a tax return because all my income (pension, bank account interest, etc.) is known to HMRC, and as this is a one-off I would prefer to pay the tax as a one-off so my tax code is not affected, etc. All advice most welcome! Mike

Hi Mike Cowlishaw,
The disposal of shares for more than they were acquired for, results in a capital gain.
The new method of reporting those gains is by declaring the gain online at:
Report and pay your Capital Gains Tax
This should be done before 31 December after the tax year has ended.
If the ‘real time’ Capital Gains Tax service is not used to report the gains before 31 December, then the gains must be reported in a Self Assessment tax return.
Thank you. 

 

Very many thanks! Exactly what I needed.