The meaning of the Acronym IRS is...

IRS is

• Infernal Revenue Service
• International Riot Society
• Income Revenue Service
• Improving The Republican Summer
• Invisible RattleSnakes

More Meanings For IRS:

• Resource (WordPerfect)
• Interchange Recors Separator
• Intelligent Register System
• It Really Stinks
• I Respect Someone
• I'm Really Sexy
• International Reference Star
• Infrared Spectroscopy
• Indian Remote Sensing
• Inverse Repeated Sequence
• Instructor Rating System
• Intelligent Responsible Students
• Intimate Relations Schedule
• I'm Really Sexy
• It's Really Stupid

IRS is also in:

• Adults
• Astronomy
• Chat
• Electronics
• File Extensions
• General
• Geology
• Mathematics
• SMS
• Universities