The era when a personal banker or an accountant were the only people with access to our financial secrets is officially over. Today, millions of users worldwide, including a growing number of Greeks, are turning to Artificial Intelligence (AI) tools like ChatGPT, Gemini, and Claude for advice on investments, tax returns, or household budgeting. However, this new digital convenience comes with a heavy price: the exposure of highly sensitive data to algorithms that, by their nature, are not designed to uphold banking secrecy.

The Privacy Trap and Data Leakage

The core problem stems from how we interact with chatbots. The naturalness of the language creates an illusion of trust. Many users do not hesitate to "upload" PDF files containing tax statements, bank account movements, or even business plans, asking the AI to analyze them or suggest ways to save money. What often escapes notice is that, in most free versions of these tools, the data entered is used to further train the models.

  • Model Training: Your information becomes part of the system's "knowledge," meaning it could theoretically emerge in responses to other users, albeit in an anonymized form.
  • Cybersecurity: Storing this data on tech companies' servers creates a new target for hackers.
  • Lack of Oversight: Unlike financial advisors, chatbots are not bound by the code of ethics of regulatory bodies like the SEC or national central banks.

Hallucinations and Financial Errors

Beyond the issue of privacy, there is the structural problem of "hallucinations." Large Language Models (LLMs) are excellent at predicting the next word in a sentence, but they lack a true, deep understanding of laws or mathematical operations. A chatbot can state with absolute certainty a tax law that has been repealed or make an error in a complex compound interest calculation.

"Using AI for financial decisions without human supervision is like driving a car blindfolded, relying on someone describing the road from memory," market experts warn.

In Greece, the tax system is particularly labyrinthine. A user's attempt to interpret changes in imputed income or exemptions for electronic receipts through a global AI model can lead to catastrophic fines. These models often rely on data from the US or the UK, ignoring the specificities of Greek legislation.

The EU AI Act and Corporate Responsibility

The European Union, through the AI Act, is attempting to set boundaries. AI systems used in the financial sector are often classified in high-risk categories. However, the responsibility for data input remains with the end-user. Banks worldwide have already begun banning their employees from using public chatbots to process corporate data, fearing leaks of strategic importance.

For the average citizen, the advice is clear: use technology for general information and education, but never share data that can financially identify you. Artificial Intelligence is an excellent research assistant but a dangerous wealth manager.

Conclusions and Protection

Digital maturity requires us to understand that in economics, information is the currency itself. Before you hit the submit button, ask yourself: "Would I give this document to a stranger on the street?" If the answer is no, then it has no place in a chatbox. Protecting our data is the first and most important investment we can make in the age of AI.