The pie chart measures the three components—non-filing, underreporting and underpayment—that made up the total tax gap from 2008 to 2010.
The data for the graphic are as follows:
| Category | Annual Average for TY2008-10 (in billions) |
| Non-filing | $32 |
| Underreporting | $387 |
| Underpayment | $39 |