24/09/2026
Why AI will never replace proper professional advice.
💡📊A financial adviser client recently rang me about one of his clients cashing in a long-term growth bond, producing a chargeable gain of over £400,000 for the 2026/27 tax year.
The client’s only other income is a modest pension of just over £20,000.
Naturally, the adviser ran the numbers.• AI calculated the tax due at: £83,400.
Naturally, the client panicked!
😱They brought the figures to me to review. As a Chartered Accountant, I actually look at the underlying tax legislation—not just what a computer screen spits out.
The computer (and the AI) made a classic mistake: it lumped the entire £400k+ gain into a single tax year, completely wiping out the client's Personal Allowance and slamming them into the higher and additional tax bands.
What both systems completely failed to account for were the intricate rules surrounding Top Slicing Relief—specifically how the calculation treats the annual "slice" of the gain to recalculate the loss of the Personal Allowance.
My calculation of the actual tax due? £2,514.
Guess who was right?
It certainly wasn’t AI.
AI is a fantastic tool for quick drafts and summaries, but when it comes to complex UK tax law, high-value decisions, and saving you an £80,000 tax headache—nothing replaces a qualified professional.
Don't let an algorithm compute your tax bill.
Talk to a Chartered Accountant!
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