AWS bug flashed trillion-dollar cloud bills

An AWS software bug briefly made some customers' projected cloud bills explode into the billions and even trillions of dollars. Amazon said the problem was limited to the AWS Cost Management Console and affected only estimated billing, not real usage records or final invoices.

The issue, reported on Jul. 20, 2026, followed a software change to AWS’s estimated billing computation subsystem, according to the company’s status page. That change introduced a bug that applied incorrect unit pricing when calculating projected costs. Users on X and Reddit posted screenshots showing estimated charges from the millions into the billions, and The Guardian reported at least one case above $1 trillion.

“I just saw $1.5tn on my AWS bill and my soul left my body.”

×

In simple terms, the estimate went wrong because the system multiplied normal resource usage by the wrong price. The source gives a hypothetical example: 100 GB of storage at the correct rate of $0.023 per GB should cost $2.30. If the estimator mistakenly used $10 million per GB, that same usage would appear as a $1 billion bill.

Recommended reading

UK water industry says AI data center plans ignore supply limits

AWS said the underlying usage data stayed accurate throughout the incident. The company first tried to roll back the software change, but that did not resolve the problem. It then disabled the estimator, identified the error hours later, and started a gradual fix rollout.

The glitch was temporary, but the episode shows how bad cost data can ripple across engineering, finance, and security teams. An impossible bill can look, at first glance, like a compromised account or a runaway workload. For companies that depend on software-generated numbers to make operational and financial decisions, even a short-lived dashboard failure can create real disruption.