Imagine opening your monthly cloud hosting bill expecting to see a charge of roughly a dollar. Now imagine that bill reads $1.5 trillion. That’s not a hypothetical. It happened to AWS customers around the world on July 17, 2026, when a bug in Amazon’s billing estimation system turned routine invoices into numbers that would make sovereign wealth funds sweat.
One UK charity, which typically pays less than £1 per month, was greeted with a projected charge of £5.8 billion, roughly $7.8 billion. The man who manages that account told The Guardian he “almost had a heart attack.”
What actually happened
The glitch originated at approximately 3:38 a.m. UK time on July 17, triggered by an issue with unit pricing inside AWS’s estimated billing computation subsystem. The bug didn’t touch actual charges, only the projected estimates displayed in AWS’s Billing and Cost Management Console and Cost Explorer tools.
But “only the estimates” is cold comfort when those estimates show usage spikes north of 745 trillion percent.
