An SME owner put it to me exactly like this a few weeks ago: "In Spain, everyone talks about time clocks and fines. Here, am I required to have something like that or not?". The short answer is uncomfortable because it has two parts. There is no law in Argentina that literally says "every employer must install a clock-in system." But there are three obligations that, together, leave you in the same situation: you must be able to prove the hours your people worked. And if you can't, you lose. Let me explain the real nuance.