In short: AI is brilliant at sounding certain. Tax is the one place where confident and wrong is the most expensive combination there is.
Ask an AI a tax question and you get a fast, fluent, confident answer. That is exactly the problem. Tax is not a knowledge quiz. It is a moving set of rules that depend on your numbers, your structure, the current year, and the country you are sitting in. Fluent and wrong is the most expensive combination in this entire field.
A language model cannot see your full picture. It has not read your management accounts, your dividend history, your VAT position, or the plan you have for the business in three years. It answers the narrow question you typed, not the broader one you should have asked. Most costly tax mistakes are not wrong answers to the right question. They are confident answers to the wrong one.
It is also frozen in time and blind to nuance. Thresholds, allowances, and reliefs change, sometimes mid-year. A model trained months ago will happily quote last year's numbers with total conviction, and it has no idea which grey areas get pushed back on in practice. You find out when the return is questioned, not before.
Then there is accountability. When a real adviser signs off on a position, they are on the hook for it, and they are thinking about your next decision, not only this one. An AI carries no responsibility for the penalty, the interest, or the planning opportunity you quietly missed. You carry all of it.
None of this makes AI useless. It is genuinely good for explaining a concept in plain English or helping you frame a question before you speak to someone. Use it as a translator, not as your adviser. For anything that touches what you file, what you pay, or what you keep, talk to a person who can see the whole board.
Because that is the real job: making the decisions around the tax questions, before the money moves. No model does that for you.
Common questions
It is best used as a translator, not an adviser. AI is good for explaining a concept in plain English or framing a question before you speak to someone. For anything that touches what you file, pay, or keep, talk to a person who can see your whole position.
Because it cannot see your full picture, your accounts, dividend history, VAT position, or plans, so it answers the narrow question you typed rather than the one you should have asked. It is also frozen in time and will quote outdated thresholds with total confidence.
Explaining a concept in plain English and helping you frame a question before a conversation with an adviser. Used as a translator rather than a decision-maker, it can save time. The judgement about your specific numbers and the decisions around them still needs a person.
You are. An AI carries no responsibility for a penalty, interest, or a planning opportunity you missed. When a real adviser signs off on a position they are accountable for it and are thinking about your next decision too, which a model simply does not do.
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Simon Jacobs is a Chartered Tax Adviser (CTA · ACA) and ex-PwC, founder of SRJ International. He advises founder-led UK marketing agencies on tax, profit extraction and exit. Read his full profile →