Plenty of companies clock in on one system and manage HR on another. On paper that doesn't sound like a problem — each tool does its job. In practice, the gap between the two systems is exactly where overtime gets mispaid: someone has to pull the clock-in data, calculate by hand how many extra hours were worked, apply a rate, and carry that figure over to payroll. Every manual step is a chance for an error.
Time tracking isn't just a legal requirement in Spain (Article 34.9 of the Workers' Statute). It's also the source of a number that has to reach payroll intact: how many extra hours each person worked, and what those hours are worth.
The overtime rate isn't typed in by hand
Calculating an overtime rate is a formula, not a judgment call: annual gross salary divided by 1,792 hours. When that calculation is done clock-in by clock-in, by hand, different people in HR can apply slightly different logic — or simply misplace a decimal. When the time-tracking system and the payroll system are the same, the hourly rate always comes from that formula, with nobody typing it in.
The annual overtime cap, checked at approval
Spanish law caps overtime at 80 hours a year (barring force-majeure exceptions). That cap only holds if it's checked the moment an overtime request is approved — not at year-end, when it's too late to fix anything. A standalone time-tracking system has no way of knowing how many overtime hours someone has already logged in the HR system — and vice versa.
Fewer manual handoffs, fewer disputes
When clock-in data feeds payroll directly, the step where someone exports a spreadsheet from the time-tracking tool, reviews it, and re-enters it into payroll disappears. That middle step adds no value — only time and error risk. And it's almost always the origin of the employee complaint that comes from checking a payslip and not understanding why the hours don't match what they clocked.
Traceable data also survives an inspection
Integrating time tracking with payroll isn't just about internal efficiency: the same data that feeds payroll is what Spain's labor inspectorate can ask to see. If the time-tracking record keeps a hash-chained audit trail — built to withstand the ITSS's Technical Criterion 101/2019 — the overtime figure that shows up in payroll is exactly the one that shows up in the clock-in history, with no two competing versions of the same truth.
That same logic extends to any pay concept tied to hours worked, not just overtime: the fewer manual steps between the time clock and payroll, the fewer chances there are for a number to get transcribed wrong.
Integrating time tracking with HR isn't about convenience. It's about making sure a number never has to cross from one system to another through someone's hands — which is, in practice, where precision gets lost. The fewer hands a number passes through, the more it can be trusted at the end of the month.