Form 1065 vs. Form 1120S: Choosing the Right Tax Form for Your Business
Selecting the right tax form is essential for ensuring IRS compliance and maximizing tax benefits. Two commonly used tax forms are Form 1065 and Form 1120S, each designed for different types of business structures. Understanding the differences between Form 1065 and Form 1120S will help you determine which one best fits your business model and financial goals.
For a step-by-step breakdown, read our guide on Form 1065 vs. Form 1120S.
What is Form 1065?
Form 1065, also known as the U.S. Return of Partnership Income, is used by partnerships and multi-member LLCs to report income, deductions, and financial activities. Since partnerships are pass-through entities, the business itself does not pay taxes. Instead, profits and losses pass through to partners, who report them on their individual tax returns.
Who Needs to File Form 1065?
Any business classified as a partnership that earns income must file Form 1065, including:
General partnerships
Limited partnerships (LPs)
Multi-member LLCs
Each partner receives Schedule K-1 (Form 1065), which outlines their share of the business’s income, deductions, and credits. To ensure accurate filing, read our blog on Schedule K-1 reporting.
Form 1065 Filing Deadline
The Form 1065 due date is March 15 for calendar-year partnerships. Since March 15, 2025, falls on a weekend, the deadline is extended to March 17, 2025. Partnerships needing more time can request an extension using Form 7004, granting an additional six months to file.
What is Form 1120S?
Form 1120S, the U.S. Income Tax Return for an S Corporation, is used by S corporations to report income, deductions, and credits. Like partnerships, S corporations are pass-through entities, meaning income is distributed to shareholders, who report their share on their personal tax returns.
Who Can File Form 1120S?
To qualify for Form 1120S filing, a business must:
Be a domestic corporation
Have 100 or fewer shareholders
Issue only one class of stock
Ensure shareholders are U.S. citizens or residents
Elect S corporation status by filing Form 2553
For a step-by-step filing guide, read our blog on Form 1120S filing.
Form 1120S Filing Deadline
The Form 1120S deadline is March 15 for calendar-year S corporations. Since March 15, 2025, falls on a weekend, the due date is extended to March 17, 2025. Businesses can request a six-month extension using Form 7004, moving the deadline to September 15.
Form 1065 vs. Form 1120S: Key Differences
Feature
Form 1065 (Partnerships)
Form 1120S (S Corporations)
Entity Type
Partnerships, Multi-member LLCs
S Corporations
Taxation
Pass-through to partners
Pass-through to shareholders
Filing Deadline
March 15 (March 17 in 2025)
March 15 (March 17 in 2025)
Ownership Restrictions
No restrictions
Max 100 shareholders, one stock class
Self-Employment Tax
Partners pay self-employment tax
Shareholders may avoid some self-employment tax
Pros and Cons of Each Tax Form
Advantages of Filing Form 1065
Flexibility in allocating profits and losses among partners
No corporate tax, avoiding double taxation
Fewer ownership restrictions compared to S corporations
Disadvantages of Filing Form 1065
Partners must pay self-employment tax on earnings
Requires detailed reporting for each partner via Schedule K-1
Limited ability to reinvest profits without immediate tax consequences
Advantages of Filing Form 1120S
Shareholders can receive dividends, which are not subject to self-employment tax
Business owners can pay themselves a salary, reducing taxable business income
Potentially lower tax liability due to tax-efficient distributions
Disadvantages of Filing Form 1120S
Strict ownership restrictions (100 or fewer shareholders, U.S. residents only)
More corporate formalities than partnerships
Must elect S corporation status using Form 2553
Which One Should You Choose?
The decision between Form 1065 filing and Form 1120S filing depends on your business structure and tax strategy:
Choose Form 1065 if you run a partnership or multi-member LLC and want flexibility in profit-sharing.
Choose Form 1120S if you own an S corporation and want to reduce self-employment taxes while paying yourself a reasonable salary.
Common Filing Mistakes to Avoid
Missing the deadline – Ensure you meet the Form 1065 filing deadline or Form 1120S filing deadline to avoid IRS penalties.
Errors in Schedule K-1 reporting – Mistakes in Schedule K-1 reporting can lead to IRS scrutiny.
Choosing the wrong business structure – Make sure you understand whether a partnership or S corporation is the best option for your business.
Forgetting Form 2553 – If filing Form 1120S, don’t forget to elect S corporation status using Form 2553.
Conclusion
Understanding the differences between Form 1065 vs Form 1120S is crucial when choosing the right tax structure for your business. While both forms allow for pass-through taxation, they have different tax implications, filing requirements, and ownership rules. For expert assistance, schedule a free consultation with our tax professionals today. We’ll help you determine the best tax strategy for your business while ensuring IRS compliance.
