How to fact-check AI answers about money — a 4-step check
AI can explain money in seconds — and get a rule, a date or a number wrong with total confidence. Here's a simple 4-step check that catches most mistakes before they cost you anything.
Why AI gets money facts wrong
AI chat assistants (like ChatGPT, Claude or Gemini) are built to write answers that sound right. Most of the time they are. Sometimes they aren't — and they sound just as sure.
A made-up or wrong answer that sounds confident is called a hallucination. With money, there are 3 extra reasons it happens:
- Rules change. Laws, limits and fees get updated. AI may know the old version.
- Numbers drift. Rates, prices and contract details change daily or yearly.
- Details blur. Similar rules in different countries or markets get mixed up.
A real example: the $25,000 rule
For years, US brokers required $25,000 in a margin account to day trade freely. That was the old pattern day trader rule (PDT rule).
In 2026 that minimum was eliminated — the SEC approved the change in April 2026, and FINRA's new rule took effect in June 2026.
An AI that learned from older text may still tell you, with full confidence, that you need $25,000. It's not lying. It just doesn't know. That's why checking matters.
The 4-step check
Step 1: Spot the claims
Read the answer and underline every fact: numbers, dates, rules, names, limits. Explanations are usually fine. Facts are where errors hide.
You can ask AI to do this for you:
List every fact, number, date and rule in your last answer as a numbered list. For each, say how sure you are (high / medium / low) and what kind of source would confirm it.Step 2: Ask "as of when?"
As of what date is each of these facts true? Which ones might have changed since your training data?Anything about rules, rates, fees or prices gets extra suspicion. If the AI can't give a date, treat the fact as unchecked.
Step 3: Check the source yourself
Go to the primary source — the organisation that makes the rule or publishes the number. Not a blog, not a forum, not another AI.
| What you're checking | Where to look |
|---|---|
| US stock and broker rules | finra.org, sec.gov |
| Investor basics and scam alerts | investor.gov |
| Futures and forex rules, leverage limits | cftc.gov |
| Futures contract sizes and tick values | cmegroup.com |
| Interest rate decisions | federalreserve.gov |
| Inflation and jobs data | bls.gov |
| Company results | The company's investor page or SEC EDGAR |
| Your own account's rules | Your broker's own help pages or support |
If the source says something different, the source wins. Every time.
Step 4: Redo the math
AI can slip on arithmetic, especially with several steps. Any money math — risk per trade, Leverage, position size, fees — redo it with a calculator.
Example: "Risk 1% of a 5,000-unit account with a stop 25 units away per share." 1% of 5,000 = 50. 50 ÷ 25 = 2 shares. It's a math example, not a promise.
Then confirm with the position size calculator or the margin calculator. Two methods agreeing beats one confident answer.
Rule of thumb: explanations you can learn from; facts you must check. The more a fact affects your money, the more it needs a primary source.
Warning signs in an AI answer
- Very exact numbers with no source. "73.4% of traders…" Where's that from?
- No date on a rule or rate.
- Advice that fits you a little too neatly, especially if you led the question.
- Made-up links or citations. Click every link it gives. Some point nowhere.
- Tax or legal specifics. These depend on where you live and change often. Check with the official source or a qualified professional.
Prompts that reduce mistakes
You'll get fewer errors if you set rules up front:
Answer only if you're confident. If you're not sure, say "I'm not sure" and tell me where to check. Don't invent numbers, dates or sources. Mark anything that may have changed recently.And when you have a source:
Using only the text below, answer my question. If the text doesn't say, reply "not in the text".
[paste the official text]Working from pasted text is the single best way to cut hallucinations.
Ask twice, compare
A quick trick: ask the same factual question in a fresh chat, worded differently. If the two answers disagree, at least one is wrong — go to the source.
If they agree, that's a good sign, but not proof. Both can repeat the same old fact.
What not to fact-check with AI
Some questions have no fact to check, because nobody knows the answer:
- "Will this stock go up?"
- "Is now a good time to buy?"
- "Which strategy will work this year?"
A confident answer to these isn't a fact. It's a guess. Read what AI can't do for traders for the full list.
Keep a "checked facts" note. When you verify a fact — a contract's tick value, your broker's rule, a report's release time — write it down with the source and date. Next time, you won't need to ask.
Try it today
Ask any AI: "What is the maximum leverage a US retail forex trader can use?" Then check its answer against the CFTC's or the NFA's rules. (At the time of writing, it's 50:1 on major currency pairs and 20:1 on others.) Did it match? Did it give a date? That one exercise teaches the whole habit.
Questions
Can I trust ChatGPT for financial information?
Use it for explanations, then check facts — numbers, dates and rules — against primary sources like sec.gov, finra.org or cftc.gov. It can be confidently wrong.
What is an AI hallucination?
An answer that sounds right but is made up or wrong, like a rule that's changed, a wrong number or a fake source. AI usually doesn't signal when it's doing this.
How do I check if a financial rule is still current?
Go to the organisation that makes the rule — FINRA, the SEC, the CFTC or your broker — and look for the current version and its date.
Why does AI give different answers to the same question?
AI writes each answer fresh, so wording and sometimes facts vary. If two answers disagree, check the primary source.
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