My wife and I having fully surrendered an onshore investment bond have been sent a Chargeable Event Certificate dated 30/11/2023. We are both of pensionable age. I know HMRC must be informed of this gain and as it exceeds the £10000 threshold we each should register for self assessment to do this. Despite ‘searching’ online and on this forum we remain ‘at a loss’ as to precisely what to do - especially in regard to timescale.