Just discovered that my client's broker incorrectly included offshore income gains as part of the capital gains schedule in 2013/14 (£16K) and 2014/15 (£17K) so the amounts were not reported as income on her returns (which I prepared) when they should have been. [The net gains (including the mis-reported gains) were below the annual exemption so no gains tax was due or paid.] It's not clear if, or how, the broker advised my elderly client of the position but details have only just been passed on to me (when I queried the brought forward capital losses position). The 2014/15 return is in time to correct and pay the tax due. Am I right that the 2013/14 return is out of time to correct, given omission was not deliberate and reasonable care was taken? What are chances of client avoiding penalty on the 2014/15 correction? This is going to be a large and unexpected tax bill for her.