| Org. that does investigations | 29 |
| Org. that audits | 16 |
| Org. that allows you to e-file | 30 |
| Org. supported by the 16th Amendment | 36 |
| Org. receiving tax returns | 26 |
| Org. in a 2013 scandal | 22 |
| Org. headquartered on Constitution Ave. | 39 |
| Org. concerned with schedules | 29 |
| Org. concerned with income | 26 |
| Org. auditing 1040s | 19 |
| Org. "formed" inside the four longest answers | 55 |
| Offerer of e-filing | 19 |
| Not Willie Nelson's favorite org. | 37 |
| Not a popular federal org. | 26 |
| Much-maligned federal org. | 26 |
| Much Apr. mail is addressed to it | 33 |
| Miles Copeland label for tax evaders? | 37 |
| Mid-April letters | 17 |
| Mid-April abbr. | 15 |
| Major C.P.A. employer | 21 |
| Levy collector, for short | 25 |
| Levy collector | 14 |
| Letters seen in many forms | 26 |
| Its Web site has a "Where's my refund?" page | 58 |
| Its HQ is on Washington's Constitution Avenue | 49 |
| Its HQ is in D.C.'s Federal Triangle | 40 |
| Its D.C. building has the Oliver Wendell Holmes Jr. quote "Taxes are what we pay for a civilized society" | 115 |
| It's taxing | 15 |
| It's so taxing! | 19 |
| It thrives on Apr. showers of Form 1040 | 39 |
| It prints many scheds. | 22 |
| It makes Apr. the cruelest month? | 33 |
| It lets you e-file | 18 |
| It has many schedules | 21 |
| It has a variety of schedules: Abbr. | 36 |
| It has a taxing job | 19 |
| It gets a lot of returns: Abbr. | 31 |
| It gets a lot of returns | 24 |
| It brings April glowers | 23 |
| Investigator's employer: Abbr. | 34 |
| Home of many unhappy returns, briefly | 37 |
| Handler of returns | 18 |
| Grp. with a complex code | 24 |
| Grp. that's true to form? | 29 |
| Grp. that launches investigations | 33 |
| Grp. that gets a pay cut? | 25 |
| Group well-known for their spring collection | 44 |
| Group awaiting one's return, for short | 42 |
| Gp. that takes a pay cut | 24 |
| Govt. tax agency | 16 |
| Govt. collectors | 16 |
| Govt. collection agency | 23 |
| Govt. agency that gets lots of returns | 38 |
| Govt. agcy. whose website ranked higher than Facebook in a recent on-line satisfaction survey | 93 |
| Govt. agcy. that will hire nearly 16000 to implement Obamacare | 62 |
| Govt. agcy. headed by Daniel Werfel | 35 |
| GnR "Chinese Democracy" jam (Abbr.) | 45 |
| Forms grp. | 10 |
| Form 1040 receiver, for short | 29 |
| Form 1040 publisher | 19 |
| Form 1040 issuer | 16 |
| Form 1040 agcy. | 15 |
| Final resting pl. of Forms 1040 | 31 |
| Filing org. | 11 |
| Fed. collector | 14 |
| Evaders' enemy | 18 |
| Enforcer of US tax law | 22 |
| Employer of many CPAs | 21 |
| Employer of many auditors: Abbr. | 32 |
| Egger's bur. | 16 |
| Early label for R.E.M. | 22 |
| E-filing recipient | 18 |
| E-filing receiver, briefly | 26 |
| E-file recipient | 16 |
| E-file receiver | 15 |
| E-File destination | 18 |
| E-file agency | 13 |
| E-file agcy. | 12 |
| Division of Dept. of the Treasury | 33 |
| Destination of many returns | 27 |
| Destination of many filings, for short | 38 |
| Destination for e-filing | 24 |
| Destination for a W-2 | 21 |
| Dept. of the Treasury div. | 26 |
| Dept. of the Treasury dept. | 27 |
| Department of the Treasury dept. | 32 |
| DC bur. | 7 |
| D.C. tax outfit | 15 |
| D.C. tax collectors | 19 |
| D.C. destination of some income | 31 |
| D.C. collection agcy. | 21 |
| D. C. collection agency | 23 |
| CPA hirer | 9 |
| CPA employer | 12 |
| Controversial agcy. since 1862 | 30 |
| Collectors' org. | 20 |
| Collectors in Apr. | 18 |
| Collector on Apr. 15 | 20 |
| Collector in Apr. | 17 |
| Collections agcy. | 17 |