When most owners think about a POS system, they picture the checkout — the moment money changes hands. That's the least interesting thing a good one does. Treating it as a fancy cash register is how businesses pay for powerful hardware and use ten percent of it. Here's the reframe.

Almost every complaint I hear about processing costs traces back to one thing the owner never understood: how their pricing is structured. There are three models — interchange-plus, tiered, and flat-rate — and the one you're on decides how much room your processor has to profit at your expense.

Most business owners have never actually read their merchant statement — these documents are built to be unreadable. After 17 years reading contracts for a living, here's how I cut through the acronyms and junk fees to find the one number that tells you what you're really paying.