It has many schedules

• Org. with complex schedules
• Collector in Apr.
• Form W-2 provider
• Tax dept. letters
• Agency that's busy in April: Abbr
• The bureau of the Treasury Department responsible for tax collections
• Abbr. in a return address?
• Org. taking many forms
• Return address?

Wikipedia Word definitions in Wikipedia
IRS is the United States Internal Revenue Service. IRS may also refer to: