More and more people ask ChatGPT or Claude to help with their budget. It works well for some things and badly for others. In short: an assistant is a good adviser and a poor ledger.
What an AI assistant does well
- Explaining methods: 50/30/20, zero-based budgeting, envelopes, an emergency fund. It adapts the explanation to your situation.
- Drafting a first budget from a list you give it: "I earn 2,400 a month, rent is 900, this is what I spend on..." It groups, totals and suggests limits.
- What-if questions: "if I move to a flat that costs 150 more, what do I give up?", "is it better to pay off the card or save first?"
- Writing: a letter to cancel a subscription, a request to lower an insurance premium, a fair way to split bills with a partner.
Where it falls short
- It does not know your numbers unless you tell it, every time. It does not know today's balance, which bills are paid or what is due on the 28th.
- It is not a ledger: a chat is not a list of bills that repeats every month, and it will not remind you on the day the electricity is due.
- Long sums can go wrong. Assistants warn that they can make mistakes; with dozens of rows pasted into a chat, check the totals.
- It forgets context: start a new chat and the budget from last week is gone, unless you paste it again.
What not to paste into a chat
- Never passwords, PINs, one-time codes or card numbers.
- Avoid whole bank statements: they carry your IBAN, your name, other people's names and every shop you went to. If you want help with a statement, remove those first and keep only amounts and categories.
- Remember that what you write is processed by the assistant's provider under its own terms.
Questions worth asking
- "Here are my fixed bills and my income. Which three would you cut first, and why?"
- "I want 3,000 saved by June. How much a month, and what has to change in this budget?"
- "Explain the difference between saving 10% of my salary and paying myself first."
- "Write a short, polite e-mail asking my internet provider for a cheaper plan."
The best of both: your real numbers, read-only
The way around "it does not know my numbers" is to keep them where they belong, in a budgeting app, and let the assistant read them. Xpenses keeps your bills and income, knows which are paid and forecasts the month end; connected to ChatGPT or Claude, it answers "how much will I have left?" or "what is due this week?" with your real figures, and it cannot change anything. Nothing to paste, no statement in the chat. How to set it up: use Xpenses with ChatGPT and Claude.