It’s Halloween week, so gather round. Grab a flashlight, hold it under your chin, and let me tell you five true-ish tales from the world of AI and bookkeeping.
Nobody in these stories is a bad bookkeeper. They’re smart, busy people who trusted a new tool a little too fast. Every story ends with a simple fix and a “treat”: a prompt you can copy that keeps it from happening to you. Everything works with any LLM (ChatGPT, Claude, Gemini, Copilot).
GOOD NEWS: the FREE AI Skills Black Belt is open through October 31. That’s 5 days left. Sign up by Saturday and it’s yours for life. For accountants and bookkeepers. For every other business.
Horror story #1: The Social Security Séance
It was late. The report was long. She copied the whole payroll export into a chat window: names, addresses, Social Security numbers and all. The AI answered her question beautifully. The data is still out there somewhere, floating, like a ghost that won’t leave the house.
The fix: identifiers never go in. No SSNs, no EINs, no bank or account numbers, no home addresses. Use client codes instead of names, and remove the columns the task doesn’t need.
Your treat: paste only the column headers and ask: “Here are the column headers from a report I want help with. Which of these are personal or sensitive identifiers I should delete before sharing the data, and which do you actually need for [the task]?”
Horror story #2: The Phantom Number
The variance report looked perfect. Clean. Confident. And one total was simply… invented. It didn’t tie to anything. Nobody noticed until the client asked where the $4,812 came from. Nobody knew. Not even the AI.
The fix: AI drafts, you tie out. Every number in a draft should trace back to a source row you can point to.
Your treat: “Show every calculation step and which input row each number came from. Mark anything you estimated or assumed, and list anything you couldn’t calculate from what I gave you.”
Horror story #3: The Tax Rule That Doesn’t Exist
He asked about a deduction limit. The AI quoted a code section, a dollar threshold and a phase-out, all in a very official voice. The code section was real. It was about something else entirely. The threshold was from three years ago. Spooky.
The fix: treat every rule, rate and threshold from AI as a lead, not an answer. Check it against the primary source (the IRS, CRA or your state) before it goes near a client.
Your treat: “List every rule, rate, threshold and deadline you used in this answer, with the official source I should check for each, and mark each one ‘verify’. If you’re not sure a rule applies, say so.”
Horror story #4: The Email That Sent Itself
Okay, it didn’t really send itself. But it might as well have. A tired Friday, an AI-drafted client email, a quick glance, send. It had the right tone, the right greeting… and the other client’s balance in the second paragraph. Cue the scream.
The fix: nothing goes to a client until a human reads it, every time. Read it once for numbers and once for “does this belong to this client?”
Your treat: “Review this draft before I send it. Flag every number I should double-check, anything a client could misread, and any detail that might belong to a different client or a different month.”
Horror story #5: The Zombie Spreadsheet
Every year it comes back. Last year’s template, last year’s rates, last year’s due dates, shuffling into this year’s workpapers. The AI happily filled it in, because nobody told it the template was dead.
The fix: give AI this year’s facts, not just last year’s file. Update the inputs first, then let it draft. And keep one clean “golden example” that you refresh every year.
Your treat: “Compare this year’s file to last year’s template. List anything that looks carried forward unchanged, like rates, dates, names, limits or account balances, so I can confirm each one.”
The moral of the story
- Identifiers never go in. Client codes, not names. No SSNs, EINs or account numbers.
- AI drafts, you decide. Every number ties to a source, and every rule gets checked.
- A human reads it before a client does. Every time.
- Feed it this year’s facts. Old templates make zombies.
Follow those four and the only scary thing in your books will be the receipts.
FREE things to keep you safe (and sane)
- FREE AI Skills Black Belt, open through October 31 (5 days left). Nine belts, normally $1,000, yours for life once you sign up. For accountants and bookkeepers: https://humansplusagents.ai/legacy-sbc
- FREE AI Skills for every other business: https://humansplusagents.ai/legacy-sbc-aia
- Claim a FREE AI agent and try it on a real task this week: https://aiaccounting.legacysbc.com/claim-agent
- Join our FREE community, where people share what’s working (and their own horror stories): https://www.facebook.com/groups/1024923770013348
Got your own AI horror story?
Share it in the FREE community. The best one wins bragging rights and a custom prompt that keeps it from happening again.
Happy Halloween week. Lock the doors, check the totals, and never paste the SSNs.
Yvonne






