| Brain-scan letters |
| Archaeologist's letters |
| All, e.g., for this answer's last six letters? |
| Organizations with Greek letters |
| A cabinet dept. |
| Confusing statements ... and a hint to the circled letters |
| Tax planners' suggestions |
| Attend a party uninvited ... and a literal hint to five sets of circled letters |
| Accompaniers of cover letters: Abbr. |
| Surprises unpleasantly, and a hint to each starred answer's first two + last two letters |
| Tax evader's nightmare |
| Letters from the family? |
| Tax evaders' nightmares |
| Bounced-check letters |
| Danny DeVito's "Taxi" role |
| Adjust space between letters, in printing |
| Retirement plan letters |
| Whatever it takes ... as hinted at in the arrangements of black squares around the circled letters |
| Personal letters |
| ICU instruction letters |
| Destination of many Big Apple taxis |
| Letters preceding an assumed name |
| Something exploited by a tax adviser |
| Artistic place for tiny letters? |
| Sobriquet in an Obama ad about tax breaks for oil companies |
| Andy's "Taxi" character |
| Filling station letters? |
| Agency that oversees tax payments: Abbr. |
| With "a," someone undesirable ... and what's found in the circled letters? |
| Alternate identity letters |