A tax qualification will not in itself equip you to do your husband's accounts or tax returns, unless you already have considerable experience of handling the issues that you will face in doing this work. You will find that anything up to 90% of what you will learn on an academic course will be of zero relevance to your husband's situation. Much of what you will need to know (for example how to arrange tax registration)won't be covered on any academic course. I don't know how it could be cost-effective for you to subject yourself to a programme of study, which will invariably involve paying fees, buying textbooks, travelling to lectures etc over a period of time, as a replacement for professional advice on issues that by their very nature evolve on a continuous basis, sometimes at very short notice.