Only 4% (6.6M) of all tax returns reflect accurate withholding (not over- or under-withheld).

70% of all tax filers (113M) overpay their taxes throughout the year, for a total of over $500B.

On average each year, 26% of all filers (41M) owe taxes, for a total of over $280B.

9% of of all filers (14M) underpay so severely that they owe a penalty at tax time.