I think they're different. "Live within your means" is basically don't overextend yourself to live a life you can't actually afford "Pay what you owe when you

I think they're different. "Live within your means" is basically don't overextend yourself to live a life you can't actually afford "Pay what you owe when you owe it" means that if you said you'd pay somebody, make sure to do so on time. It's entirely possible to be living within your means but still have a bad habit of paying your bills weeks late.