Understanding Schedule B-2 (Form 1065): BBA Audit Opt-Out Election Guide

1. Introduction – What is Schedule B-2 (Form 1065)?

Schedule B-2 (Form 1065), officially titled “Election Out of the Centralized Partnership Audit Regime,” is an annual corporate tax election schedule administered by the Internal Revenue Service (IRS), an agency of the U.S. Department of the Treasury.

It is an attachment to Form 1065 (U.S. Return of Partnership Income). Eligible small partnerships use Schedule B-2 to make an annual election under Internal Revenue Code (IRC) Section 6221(b) to opt out of the default Bipartisan Budget Act of 2015 (BBA) centralized partnership audit regime.

2. Purpose of the Form – Why Does Schedule B-2 Exist?

Under default BBA partnership audit rules, if the IRS audits a partnership return, any resulting tax adjustments, penalties, and interest are assessed and collected directly at the **partnership level** as an “imputed underpayment.” This means the partnership entity pays the tax bill at the highest federal tax rate, rather than individual partners paying on their personal tax returns.

For small partnerships with stable ownership, entity-level tax assessments can create severe financial inequities—especially if partner ownership percentages have shifted between the audit year and the current year.

Schedule B-2 exists to provide relief for small businesses. By filing Schedule B-2, an eligible small partnership elects out of the BBA centralized audit regime. If an IRS audit occurs, the IRS must follow traditional deficiency procedures, auditing each partner individually at the partner level rather than issuing an entity-level tax bill.

3. Who Needs to File This Form

Schedule B-2 (Form 1065) is an optional annual election for eligible small partnerships. You can complete and attach Schedule B-2 if your partnership meets both strict statutory conditions under IRC Section 6221(b):

• 100 or Fewer Partners Test: The partnership is required to furnish **100 or fewer Schedules K-1** for the tax year.
• 100% Eligible Partner Types: EVERY partner in the partnership during the entire tax year was an “eligible partner.” Eligible partner types are strictly limited to:
  • Individual human beings (U.S. citizens or resident/nonresident aliens)
  • C corporations
  • Foreign entities that would be treated as C corporations if domestic
  • S corporations (subject to special disclosure rules)
  • Estates of deceased partners

4. Who Is Exempt / Ineligible to File

Many small partnerships are legally barred from filing Schedule B-2. Your partnership is **ineligible** to opt out of the BBA audit regime if it has even a single “ineligible partner” during the tax year. Ineligible partners include:

• Other Partnerships or LLCs: Any partner that is a partnership, multi-member LLC, or upper-tier pass-through entity.
• Trusts: Any partner that is a trust (including revocable living trusts, grantor trusts, and family trusts).
• Disregarded Entities: Single-member LLCs or nominees treated as disregarded entities for federal tax purposes.
• Bankruptcy Estates: Individual debtor bankruptcy estates.
• Partnerships Exceeding 100 Partners: Partnerships where the total count of Schedules K-1 issued exceeds 100 (including all individual shareholders of any S corporation partner).

5. When to File

Schedule B-2 is an annual election attached directly behind Form 1065, and it is subject to strict filing timing rules.

The election out on Schedule B-2 must be made on a **timely filed original return** (including valid filing extensions) on or before **March 15** following the close of the tax year (or **September 30** if an automatic 6-month Form 7004 extension is filed).

CRITICAL ELECTION RULE: Under Treasury Regulations, an election out on Schedule B-2 **cannot** be made on a late-filed return or on an amended return (unless the amended return is submitted prior to the original filing due date!).

6. Where and How to File

Schedule B-2 cannot be submitted as a standalone document. It must be attached directly behind Form 1065 and submitted as part of your complete partnership tax return package.

Under IRS e-filing mandates, electronic filing is required for partnerships filing 10 or more information returns. If paper filing under an approved waiver, attach Schedule B-2 directly behind Form 1065 and mail the filing package to the specific IRS service center address as per instructions for Form 1065 based on your principal place of business.

7. Step-by-Step Instructions to Fill the Form

Schedule B-2 consists of two primary parts: certification of eligible partners (Part I) and S corporation shareholder disclosures (Part II). The table below outlines the core structure of the schedule.

Form Section	Part Title	Instruction / Description
Part I (Lines 1–3)	Eligible Partners Certification	Report total count of Schedules K-1 issued and certify that every partner belongs to an eligible partner category.
Part II (Cols a–f)	S Corporation Partner Details	If an S corp is a partner, list S corp legal name, EIN, and itemize every S corp shareholder’s legal name, SSN/EIN, and address.

Detailed Filling Steps

1. Check Question 25 on Form 1065 Schedule B: Answer “Yes” to Question 25 on Form 1065, Schedule B, indicating that the partnership elects out of the BBA centralized audit regime under Section 6221(b).
2. Report Schedule K-1 Headcount (Part I, Line 1): Enter the total number of Schedules K-1 required to be furnished by the partnership for the tax year. Verify that the total is 100 or fewer.
3. Certify Partner Eligibility (Part I, Line 2): Confirm that every partner during the year was an individual, C corporation, S corporation, or decedent’s estate. If any partner was a trust or single-member LLC, stop—you cannot file Schedule B-2!
4. Complete S Corporation Shareholder Disclosures (Part II): If an S corporation is a partner, complete Part II. Enter the S corp’s legal name and EIN. List the legal name, SSN or EIN, street address, and Schedule K-1 count for **every shareholder of the S corporation**.
5. Verify 100-Partner Cap with S Corp Shareholders: Add the number of direct partners plus the number of S corporation shareholders. The combined total must not exceed 100.
6. Notify Partners in Writing: Under Treasury Regulation Section 301.6221(b)-1, the partnership must notify all partners in writing within **30 days** of making the Section 6221(b) election out.

8. Required Documents/Information Needed Before Filling

To ensure a valid Schedule B-2 (Form 1065) submission, gather the following partnership records before preparing the form:

• Master Partner Entity Roster: Legal entity classification records verifying that every direct partner is an eligible type (no trusts, LLCs, or lower-tier partnerships).
• Total Schedule K-1 Count: Final count of all Schedules K-1 generated for the tax year.
• S Corporation Shareholder Lists: If an S corp is a partner, obtain a complete list of all individual S corp shareholders, their SSNs/EINs, addresses, and K-1 statements issued by the S corp.
• Partner Written Notification Letters: Template letters used to notify partners in writing of the Section 6221(b) election out.

9. Common Mistakes to Avoid

Failing to follow strict Section 6221(b) election rules will automatically void your opt-out, defaulting your partnership back into entity-level audit taxes. Watch out for these frequent mistakes:

• Filing with Ineligible Partners (Trusts & LLCs): Attempting to file Schedule B-2 when a partner is a grantor trust, living trust, single-member LLC, or partnership. A single ineligible partner invalidates the entire election!
• Making the Election on Late or Amended Returns: Submitting Schedule B-2 on a late tax return or on an amended return filed after the original March 15 due date.
• Omitting S Corporation Shareholder Details: Listing an S corporation partner in Part I while failing to complete the detailed shareholder table in Part II.
• Exceeding 100 Partners via S Corp Attribution: Failing to count individual S corporation shareholders toward the 100-partner limit.
• Failing to Notify Partners: Forgetting to send written notice to all partners within 30 days of making the election.

10. Penalties for Non-Filing or Errors

If Schedule B-2 is rejected due to invalid partner types or late filing, the consequences are immediate:

• Invalidation of Election & Default BBA Audits: The IRS voids the opt-out election, automatically subjecting the partnership to default BBA centralized audit rules.
• Entity-Level Imputed Underpayment Taxes: If audited under BBA rules, the partnership itself is assessed an “imputed underpayment” tax bill at the highest federal tax rate (37%+) on partnership-level audit adjustments.
• Late Partnership Filing Penalties (IRC Section 6698): If a rejected return causes late filing, penalties of **$235+ per partner, per month** apply.

11. Related Forms or Schedules

Partnership managers completing Schedule B-2 (Form 1065) frequently interact with these related federal tax forms and schedules:

• Form 1065: U.S. Return of Partnership Income (Schedule B, Question 25).
• Schedule K-1 (Form 1065): Partner’s Share of Income, Deductions, Credits, etc.
• Form 7004: Application for Automatic Extension of Time To File Certain Business Income Tax, Information, and Other Returns.
• Form 8082: Notice of Inconsistent Treatment or Administrative Adjustment Request (AAR).

12. Frequently Asked Questions

1. What is the primary purpose of Schedule B-2 (Form 1065)?

Schedule B-2 allows eligible small partnerships to elect out of the default BBA centralized partnership audit regime under IRC Section 6221(b), ensuring audits are conducted at the partner level.

2. What is the BBA Centralized Partnership Audit Regime?

The BBA regime is a federal audit framework where the IRS audits, adjusts, and collects taxes directly at the partnership level as an entity-level imputed underpayment.

3. Which partner types disqualify a partnership from filing Schedule B-2?

Partnerships, LLCs, trusts (including living trusts), disregarded entities, nominees, and bankruptcy estates are ineligible partners. Having even one ineligible partner prevents Schedule B-2 filing.

4. Can a partnership with a living trust partner file Schedule B-2?

No. Under Treasury regulations, trusts (including revocable living grantor trusts) are ineligible partners for Section 6221(b) opt-out elections.

5. Can Schedule B-2 be filed on an amended tax return?

No. Under IRC Section 6221(b)(1)(D), the election out must be made on a timely filed original return. It cannot be made on a late return or an amended return.

6. Can Schedule B-2 be e-filed?

Yes. Schedule B-2 can be e-filed electronically attached directly behind Form 1065 using IRS-approved business tax software.

13. Conclusion – Key Takeaways

IRS Schedule B-2 (Form 1065) is a vital annual tax election for small partnerships seeking to avoid entity-level IRS tax assessments under the BBA audit regime. By verifying that all partners are eligible types, capping total partner counts at 100, disclosing S corporation shareholders in Part II, and submitting a timely original return by March 15, small partnerships maintain traditional partner-level tax treatment. Audit your partner roster annually for ineligible trust or LLC entities, send written notice to partners upon electing, and e-file Schedule B-2 alongside Form 1065 by your filing deadline.