Related Clues:
- April 15 deadline agcy.
- It has a variety of schedules: Abbr.
- Return destination?: Abbr.
- Grp. that launches investigations
- Taxing abbreviation?
- Tax grp.
- April addressee
- Clerk at work
- Form 1040 user
- Org. with a complex code
- Spring collector: Abbr.
- April abbr.
- April 15th taxpayer, e.g.
- Largest U.S. collection agcy.
- 1040 org.