Why does whether the bill vary in amount affect how easy it is to pay by autopay? I have every bill, including credit cards (which vary wildly from month to month) set up on autopay. And I review my finances at least monthly (and usually much more reguarly) - I get notices of every autopay before it happens. I just do not have to take ANY action to ensure the bill is actually paid. There's no risk of a bill creeping up in amount based on how I pay it.