It couldn't have been that long back as three years ago you were newly in the US with an H4 spouse visa (see https://news.ycombinator.com/item?id=6364977 https:

It couldn't have been that long back as three years ago you were newly in the US with an H4 spouse visa (see https://news.ycombinator.com/item?id=6364977 https://news.ycombinator.com/item?id=6364977 and https://news.ycombinator.com/item?id=5323455 https://news.ycombinator.com/item?id=5323455 ). I assume you asked https://news.ycombinator.com/item?id=11972642 https://news.ycombinator.com/item?id=11972642 5 hours ago for a friend? Also, even greencard/non-citizens are subject to ATT.