Payroll providers absolutely still get it wrong but not always because it's too hard. I joke, but a little serious when I say asking bureauracies to get detail

Payroll providers absolutely still get it wrong but not always because it's too hard. I joke, but a little serious when I say asking bureauracies to get details correct, quickly and consistently might be too much, let alone with software that could threaten jobs and meetings. Canada had a payroll implementation failure in government that received international attention: https://en.wikipedia.org/wiki/Phoenix_pay_system https://en.wikipedia.org/wiki/Phoenix_pay_system Having implemented more than I've wanted to - too many are still anchored in the past on a mainframe, abstracted away with a web and/or mobile app. Still worse, many payroll providers, particularly one of the very largest in Canada, actually still processes payroll according to a "model" that's manually run. It's an excel model, run manually by people. You deal with people directly. Do anything off a beaten path? Guess which model to win.