Business Tax Resource Center

S Corporation & Partnership

Everything You Need to Understand, Prepare, and File Business Tax Returns, with clear resources
on requirements, forms, deadlines, deductions, and compliance.

Explore Business Tax Resources

S Corporation

Start with the basics of business tax filing, including Form 1120-S requirements, key schedules, filing deadlines, and essential tax information.

Essentials

Form 1120-S Instructions

Understand Form 1120-S filing requirements, key instructions, required schedules, and important information for filing an S corporation tax return.

Read 1120-S Instructions

Required Dates

Form 1120-S Due Date

Understand Form 1120-S filing deadlines, extension dates, and help your S corporation file on time.

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Most helpful

Schedule K-1 (Form 1120-S)

Learn how Schedule K-1 reports each shareholder's share of income, deductions, credits, and other tax items from an S corporation.

Learn About Schedule K-1

Detailed Reporting

Schedule M-3 (Form 1120-S)

Understand how Schedule M-3 reconciles financial statement income with income reported on the S corporation tax return.

Learn About Schedule M-3

Most Helpful

Schedule B (Form 1120-S)

Learn about the additional information S corporations must provide regarding ownership, tax elections, and other filing requirements.

Read Schedule B

Most Helpful

Schedule D (Form 1120-S)

Understand how to report capital gains and losses from the sale or exchange of capital assets on Schedule D.

Read Schedule D

Income & Deductions

Schedule K (Form 1120-S)

Learn how Schedule K reports the S corporation's total income, deductions, credits, and other tax items passed through to shareholders.

Read Schedule K

Balance Sheet

Schedule L (Form 1120-S)

Understand how to report the S corporation's balance sheet information, including assets, liabilities, and shareholders' equity.

Read Schedule L

Reconciliation

Schedule M-1 (Form 1120-S)

Learn how Schedule M-1 reconciles income or loss reported on the corporation's books with income or loss reported on the tax return.

Read Schedule M-1

Shareholders' Equity

Schedule M-2 (Form 1120-S)

Understand how to analyze and report the Accumulated Adjustments Account, Previously Taxed Income, Accumulated Earnings and Profits, and Other Adjustments Account.

Read Schedule M-2

Filing Information

Form 1120-S Mailing Address

Find the appropriate IRS mailing address for Form 1120-S based on your filing situation and payment requirements.

View Mailing Address

Partnership

Start with the basics of partnership tax filing, including filing requirements, key schedules, important deadlines, mailing information, and other essential tax considerations for partnerships.

Essentials

Form 1065 Instructions

Overview of Form 1065 filing requirements and step-by-step instructions for partnership tax returns.

Read 1065 Instructions

Required Dates

Form 1065 Due Dates

Understand Form 1065 filing deadlines and extension dates based on the partnership's tax year.

View Due Dates

Most Helpful

Schedule K-1 (Form 1065)

Learn how Schedule K-1 reports each partner's share of income, deductions, credits, and other tax items.

Learn About Schedule K-1

Most Helpful

Schedule M-3 (Form 1065)

Understand how Schedule M-3 reconciles financial statement of income with income reported on the partnership tax return.

Read Schedule M-3

Partnership Information

Schedule B-1 (Form 1065)

Learn how Schedule B-1 reports information about partners who own significant interests in the partnership and certain ownership changes.

Read Schedule B-1

Partnership Elections

Schedule B-2 (Form 1065)

Learn how Schedule B-2 is used by eligible partnerships to elect out of the centralized partnership audit regime and report the required partner information.

Read Schedule B-2

Filing Information

Form 1065 Mailing Address

Find the correct IRS mailing address for Form 1065 based on the partnership's filing requirements and payment status.

View Mailing Address

State Filing

Learn the basics of state business tax filing, including state requirements, filing deadlines,
tax considerations, and essential compliance information.

Essentials

FTB CA Form 100S Instructions

Learn about California Form 100S filing requirements, instructions, deadlines, and key information S corporations need for state tax filing.

Read Form 100S Instructions

Related Forms

Explore commonly used in partnership and S corporation filings, including their filing requirements, reporting guidelines, eligible deductions, and key information needed for accurate business tax filing.

Cost of Goods Sold

IRS Form 1125-A

Learn how Form 1125-A is used to report the cost of goods sold and calculate the gross profit or loss for a business.

Learn About Form 1125-A

Officer Compensation

IRS Form 1125-E

Understand how Form 1125-E is used to report compensation of officers for eligible corporations.

Learn About Form 1125-E

Rental Real Estate

IRS Form 8825

Learn how Form 8825 is used by partnerships and S corporations to report rental real estate income and expenses.

Learn About Form 8825

Depreciation & Amortization

IRS Form 4562

Understand how Form 4562 is used to report depreciation, amortization, and certain property deductions.

Learn About Form 4562

Sales of Business Property

IRS Form 4797

Learn how Form 4797 is used to report gains or losses from the sale or exchange of business property.

Learn About Form 4797

Energy-Efficient Buildings

IRS Form 7205

Learn how Form 7205 is used to calculate and claim the Energy Efficient Commercial Buildings Deduction for qualifying property.

Learn About Form 7205

Comparisons & Insights

Explore helpful business tax comparisons and insights to better understand filing requirements, tax treatment, reporting differences, and important business tax considerations.

Form Comparison

Form 1120-S vs. Form 1120

Understand the key differences between Form 1120-S and Form 1120, including tax treatment, filing requirements, and how business income is reported.

Compare Form 1120-S vs. Form 1120

Form Comparison

Form 1120-S vs. Form 1065

Compare S corporation and partnership tax filing requirements, including ownership, tax treatment, schedules, and income reporting.

Compare Form 1120-S vs. Form 1065

Schedule Comparison

Schedule K vs. Schedule K-1

Learn the difference between Schedule K and Schedule K-1 and how each reports business income, deductions, credits, and other tax items.

Compare Schedule K vs. Schedule K-1

Stated Items

Separately Stated vs. Nonseparately Stated Items

Understand the difference between separately stated and nonseparately stated items and how they are reported on an S corporation tax return.

Learn About Stated Items

Separately Stated

Form 1120-S Separately Stated Income Items

Learn which income, deductions, credits, and other tax items must be separately stated and passed through to S corporation shareholders.

Learn About Separately Stated Items

Basis Reporting

Form 1120-S Stock and Debt Basis

Understand how shareholders determine and track stock and debt basis and how these amounts affect deductions for S corporation losses.

Learn About Stock & Debt Basis

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