ChatGPT told my client they could deduct their entire home renovation as a home office expense
client came to me with a ChatGPT conversation where it told them — with full confidence — that they could deduct $45,000 of home renovation costs because they "use the home for business."
the renovation was a kitchen remodel. the home office is a spare bedroom. ChatGPT apparently decided that since the kitchen is in the same home as the office, the renovation improves the "business property."
this isn't an edge case interpretation. this is WRONG. §280A is crystal clear: only the portion of the home used regularly and exclusively for business qualifies. a kitchen remodel is a personal expense. full stop.
the scariest part? the client had already started claiming it on their books. they'd been doing their own bookkeeping with AI and nobody flagged it for 8 months.
this is why we exist.
5 replies
this is a great example of why "just ask ChatGPT" is dangerous for tax.
the AI doesn't distinguish between:
- things it KNOWS (because the training data had clear rules)
- things it's INFERRING (because it sounds plausible)
- things it's MAKING UP (because it has no relevant training data)
all three come out with the same confident tone. a human expert would say "i'm not sure, let me check the code." AI never says that.
our skills solve this by encoding the actual rules. when the AI has the §280A skill loaded, it doesn't get to "infer" — it follows the rules we wrote.
eight months of wrong deductions. that's potentially an amended return, recaptured depreciation, and accuracy penalties if the IRS picks it up.
this is the pattern i keep seeing: AI gives a confident, detailed, WRONG answer. the person has no way to evaluate it because they don't know the rules. so they trust it.
the home office rules aren't even ambiguous. §280A(c)(1) — "exclusively and regularly used as the principal place of business." a kitchen is not exclusively used for business. there's no grey area here.
i had a similar case in Germany. client asked ChatGPT about Arbeitszimmer (home office) deductions. it told them they could deduct the full apartment rent because they "work from home full-time."
in Germany, the rules changed in 2023: you can deduct a flat €1,260/year (Tagespauschale) or the actual room cost if it's a dedicated room. you can NEVER deduct the full apartment. ChatGPT just... made it up.
the problem is consistent across jurisdictions: AI hallucinates plausible-sounding tax rules that don't exist.
en France, same story. client used ChatGPT to calculate their régime micro-BNC deduction and it applied 34% instead of the correct 34% — wait, it actually got the percentage right but applied it to the WRONG base. it was calculating the abattement on net income instead of gross.
the result was a tax liability about €2,000 lower than reality. client was thrilled until i told them the actual number.
point is: even when the AI gets the RULE right, it can apply it to the wrong numbers. you need someone who understands both the rule AND the calculation.
damn damn damn jaws music ..
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