Self-Assessment (personal tax account) for minor

My minor nephew has to complete a self-assessment. Naturally, he receives assistance from his parents and myself in this regard. Last year, an online personal tax account was set-up in this regard, which worked well, and he was able to file online. This year, the online account required 'age verification' on login, with the further message that he was unable to complete the verification process due to being too young (under 16, from memory). So, a paper form had to be obtained. Can a minor have an online personal tax account for self-assessment? Thanks.

Hi,
There is no reason why a minor cannot have a personal tax account. You will need to contact our online support team for advice on log on issues. 
Technical support with HMRC online services
Thank you.