Opinion piece on Q-Day: quantum computers could eventually break the encryption that protects bank transfers, medical records and digital signatures. Estimated qubits needed to break common keys fell from about 20 million (2019) to under 1 million (May 2025). The article says data stolen today can be stored and decrypted later. The US has set post-quantum deadlines for federal agencies (2030 and 2031), and big tech firms have set their own targets. For a small business, there is no action needed this month. Ask your bank, accounting software and payment providers whether they have a post-quantum migration plan, and keep it on the list for the next year or so.