Most people don’t lose money because they can’t budget. They lose money because a tiny banking slip—one late deposit, one mistyped transfer, one forgotten subscription—triggers a chain of fees that snowballs fast. Banks aren’t “out to get you,” but they do run on rules, cutoffs, and automated systems that don’t care why something happened. Once you understand which bank policies turn small mistakes into expensive ones, you can set up simple guardrails and stop paying for avoidable friction. Here are six policies that commonly cause the biggest “how did that cost so much?” moments.
