IRS Tax Data

Data from IRS annual SOI Tax Stats Individual Complete Report (Publication 1304), Table 1.4

Why is "Number of Returns Filed" included on each table?

To give context. If 40% of all qualified dividends income is going to those making >1M a year then it's relevant to know that those making >1M a year account for 0.3% of taxpayers.

Why does it look like some bars are missing on a few data sets?

On a few of the categories the number of filers is so small for a specific income category that the IRS omits this data to protect privacy (i.e. the number of filers with income from farming and an AGI >1M is very few.)