I made a gain on sale of shares in the initial part of the year (before November 30th) on which Capital Gains Tax must be paid before December 15th. However, I intend to sell some loss making shares before the end of the year to offset the gains and reduce them to below the €1,270 limit for CGT (but I'd prefer not to do this until December). Do I still have to make the CGT payment before December 15th? It could be the best part of a year before I file a tax return when presumably Revenue would refund the money -- why should they get to hold onto money not due?