“The exercise was held from May 8 to 9, 2024, at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, and at a Federal Emergency Management Agency (FEMA) site in Denver, Colorado.”
Article refers to a PDF of the report it’s based on:
https://www.jhuapl.edu/sites/default/files/2025-04/Space-Weather-TTX-Report-Summary-v3-FINAL.pdf
You won’t have to pay anything unless you’re pulling in the equivalent of >$126,500 USD in foreign income. Then you’re taxed on what you make above that. My H&R Block lady here in Germany told me all about it when I file every year. And boy howdy is fuuuuucking stupid that I’m having to file US taxes every year. I could stop, but then everything falls apart for me.