That’s all? Only $50,000 household income in 2015?
Heck I made that all by myself in 1986.
2012, actually. But, I cited the wrong number: I inadvertently used the "constant dollar" table (which was adjusted by the CPI to 1990 dollars), instead of the "current dollar" table.
The closest value for 2012 was $47,475, which was the AGI floor for the top 40 percent. That means that 60% of households had an AGI that was less than that.
You can find this information and much more here:
https://www.irs.gov/pub/irs-soi/12in01etr.xls
Be aware that it's an Excel worksheet, so you will need an application to view it after downloading.