File a return & find other forms

• E-file and e-pay requirements for certain filers
• Forms and instructions (current year)
• Forms and instructions (prior years and periods)
• LLC/LLP/Partnership forms (current year)
• Tax calendar
• Corporation Tax Issuer’s Allocation Percentages Inquiry

Make a payment

• Penalty and interest calculator
• Pay a bill (assessment) 
• Interest rates
• Underpayment of estimated tax by a corporation

Publications

• Publications
• Memos (TSB-Ms)
• Advisory Opinions
• Guidances
• Corporation tax statistical reports

Start, expand, or end a business

• Start or buy a business (Español)
• Expand a business
• End a business
• Online permit assistance and licensing
• Empire Zones Program information

• Business Answer Center (FAQs) 
• Sign up for our e-mail Subscription Service
• Outreach events
• LLC, LLP & partnership information
• Voluntary disclosure and compliance program