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Re:As AWS Use Soars, Companies Surprised by Cloud Bills by neuronflux on Monday February 25, 2019 @12:31PM (#19247429)
You can choose how to setup your billing for reserved instances.

> You can choose to pay for your Reserved Instance upfront, partially upfront, or monthly

source: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/concepts...

Re:As AWS Use Soars, Companies Surprised by Cloud Bills by cobookman on Monday February 25, 2019 @01:35PM (#19248092)
You get the best discount by paying fully upfront. If you do this, the AWS bill doesn't show the RI on your monthly bill what-so-ever. Leading to a suprise 3 years down the road.
Re:As AWS Use Soars, Companies Surprised by Cloud Bills by user5994461 on Monday February 25, 2019 @02:27PM (#19248569)
And more importantly you're engaged to pay for the full year no matter which option you pick, with (almost) no possibility to cancel.

Long story short, only play 1 year full upfront.