Tax Filing Forms

Explore the key forms required for tax compliance based on your business structure. We provide information on deadlines, penalties, and which entity types require each form.

IRS Forms

Form 1120

U.S. Corporation Income Tax Return

C Corporation
Due Date

April 15 (calendar year) or 15th day of 4th month after year end

Penalty

Up to 25% of unpaid tax

Form 5471

Information Return of U.S. Persons With Respect to Certain Foreign Corporations

C Corporation with foreign shareholders
Due Date

Filed with Form 1120 or 1065

Penalty

$10,000 per form for late filing

Form 1065

U.S. Return of Partnership Income

LLC with foreign partners
Due Date

March 15 (calendar year) or 15th day of 3rd month after year end

Penalty

$195 per partner per month, up to 12 months

Form 8858

Information Return of U.S. Persons With Respect to Foreign Disregarded Entities

LLC with foreign partner
Due Date

Filed with Form 1120 or 1065

Penalty

$10,000 per form for late filing

State Forms

State Corporation Income Tax Return

Various forms by state

All entity types
Due Date

Varies by state, usually same as federal or 30 days after

Penalty

Varies by state, typically percentage of tax due plus interest

State Annual Report/Franchise Tax

Annual filing to maintain good standing

All entity types
Due Date

Varies by state

Penalty

Late fees, loss of good standing, potential dissolution

City Forms

City Business Tax Return

Local tax returns for cities with business tax

All entity types with city nexus
Due Date

Varies by municipality

Penalty

Varies by municipality, typically percentage of tax due plus interest

Need help determining which forms you need?

Our tax experts can analyze your business structure and operations to identify all required filings.

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