The BBA Partnership Audit Playbook: Partnership Representatives, Push-Out Elections, and the Imputed Underpayment Trap You Did Not See Coming

Here is the part most partnership agreements get wrong. If your partnership is audited under the rules that have applied since 2018, the IRS does not chase your partners. It assesses tax against the partnership itself — at the highest individual tax rate, on the net positive adjustment, in the year the audit closes, regardless of who owned the partnership when the original return was filed.

That last clause is the one that buries people. A partner who bought in last year can end up bearing a share of a tax bill that traces to a transaction three years before they showed up. Unless somebody at the partnership reads the BBA rules carefully and acts within tight windows, the default outcome is rarely the fair one.

This guide walks through the Bipartisan Budget Act of 2015 (BBA) centralized partnership audit regime as it operates today: who it covers, why the partnership representative is one of the most consequential roles in the operating agreement, when to elect out, when to push out, and how to use Form 8082 to fix your own mistakes before the IRS finds them.

Why BBA Replaced TEFRA

Before 2018, partnership audits ran under TEFRA — the Tax Equity and Fiscal Responsibility Act of 1982. TEFRA was a procedural maze. The IRS had to determine adjustments at the partnership level but then chase each partner individually for the tax. For large partnerships with hundreds or thousands of partners, this was administratively unworkable. By the early 2010s, the IRS audited fewer than 1 percent of large partnerships, a figure repeatedly flagged by GAO reports as a major source of the tax gap.

The Bipartisan Budget Act of 2015 replaced TEFRA with a centralized regime that does three things differently:

Adjustments are determined and collected at the partnership level, not partner by partner.
One person — the partnership representative — speaks for the partnership with binding authority.
The default tax is computed at the highest individual rate on the net adjustment, then paid by the partnership in the year the audit closes (the "adjustment year"), not the year being audited (the "reviewed year").

The result is administratively simpler for the IRS — and considerably riskier for partnerships and their partners if nobody understands the levers built into the statute.

Who BBA Applies To

BBA applies to every partnership filing Form 1065 for tax years beginning after December 31, 2017, unless the partnership timely elects out under Section 6221(b).

That includes:

LLCs taxed as partnerships
Limited partnerships
General partnerships
Limited liability partnerships
Any other entity filing Form 1065

Single-member LLCs that file Schedule C are not partnerships and are not affected. S corporations have their own audit rules and are not affected either — though, as we will see, an S corporation that is itself a partner of a partnership does affect the elect-out math.

Electing Out: Schedule B-2 and the 100-Partner Ceiling

The cleanest way to avoid the BBA regime is to elect out of it. You do this every year, on a timely filed Form 1065 (including extensions), by:

Checking "Yes" on Schedule B, line 25 of Form 1065 (the line number can shift between revisions, but it is the question that asks whether the partnership is electing out).
Attaching Schedule B-2 (Form 1065) listing every eligible partner with legal name, taxpayer identification number, and partner type.
Notifying every partner of the election within 30 days.

Two requirements must be met:

Requirement 1: 100 or fewer partners during the year. The count is based on Schedules K-1 issued. Crucially, if any partner is an S corporation, you must add that S corp's shareholder count to your partner count. A partnership with 60 individual partners and one S corp partner with 50 shareholders has 110 partners for elect-out purposes — and cannot elect out.

Requirement 2: Every partner must be an eligible partner. Eligible partners include individuals, C corporations, foreign entities that would be treated as C corporations if domestic, S corporations, and certain estates. Trusts (other than grantor trusts owned by a single individual), partnerships, disregarded entities, and nominees are not eligible partners. A single ineligible partner — for example, a tier of partnership above you — kills the election for everyone.

If you elect out, IRS audits revert to the older deficiency rules: each partner is examined individually for their share of any adjustment. That is administratively heavier on each partner, but it preserves the historic principle that the partner who got the deduction pays the tax.

Smaller, simple partnerships with stable ownership usually elect out as a matter of course. Real estate funds, private equity vehicles, and any partnership with another partnership in its capital stack typically cannot.

The Partnership Representative: A Single Point of Failure

If you cannot elect out, the most important provision in your operating agreement is the one that names and constrains the partnership representative (PR). The PR is named on Form 1065, line 1 of the "Designation of Partnership Representative" block, every year.

What the PR can do, under Section 6223, is sweeping:

Bind the partnership to any audit adjustment, settlement, or extension of the statute of limitations.
Decide whether to modify the imputed underpayment.
Decide whether to make the push-out election.
Refuse to communicate with other partners about the audit.

Partners do not have statutory rights to participate in the examination, contest the PR's decisions with the IRS, or even receive notice of audit milestones. The IRS deals only with the PR.

The PR can be any person (individual or entity) with a substantial U.S. presence. If the PR is an entity, the partnership must also name a designated individual to act on the entity's behalf. The partnership can change the PR, but only at narrow windows: when filing the next Form 1065, after the IRS issues a Notice of Administrative Proceeding (NAP) using Form 8979, or in connection with a valid administrative adjustment request. If the partnership fails to designate a PR — or designates one the IRS rejects — the IRS will pick one for the partnership.

A well-drafted operating agreement does several things the statute does not:

Imposes a contractual fiduciary duty on the PR to act in the partnership's and partners' best interests.
Requires the PR to consult with the partners or a designated committee before key decisions (modification, push-out, extending limitations).
Provides a removal mechanism triggered by lack of consultation.
Indemnifies the PR for good-faith decisions, but not for self-dealing.
Allocates costs of representation, including counsel for the PR.

The PR's statutory authority is binding on the IRS regardless of what the agreement says. So partners' protection has to come from the agreement, not from federal tax procedure.

What an Audit Looks Like Under BBA

A BBA examination has a predictable sequence:

Notice of Selection for Examination. Sent to the partnership and the PR.
Information Document Requests flow only between the IRS and the PR.
Notice of Proposed Partnership Adjustment (NOPPA). The IRS proposes adjustments and computes an imputed underpayment.
270-day modification window. The PR can submit modifications that reduce the IU.
Final Partnership Adjustment (FPA). Equivalent of a 90-day letter; the partnership can petition Tax Court within 90 days.
Push-out election window. Within 45 days of the FPA, the PR can elect to push the adjustments out to reviewed-year partners.

The reviewed year is the year the IRS audited. The adjustment year is the year the audit becomes final. The mismatch is what creates the unfairness problem.

The Imputed Underpayment and Why It Hurts

Section 6225 says the default tax — the imputed underpayment or IU — is computed in seven steps. The shorthand version:

Net the adjustments by type (income, credit, etc.).
Disregard adjustments that decrease tax unless they offset same-type increases.
Multiply the net positive adjustment by the highest individual rate (37 percent in 2026; corporations get a 21 percent rate for their share).
Adjust for credits.
Add interest and penalties.

The result is paid by the partnership in the adjustment year. There is no individual partner deduction. There is no allocation by ownership percentage at the reviewed year. The partnership simply writes a check, and the burden is borne by whoever happens to be a partner when the check is written.

Two things flow from this:

A 37 percent flat rate is harsher than reality for most partnerships. Individual partners may be in lower brackets; corporate partners pay 21 percent; tax-exempt partners pay nothing. The IU systematically over-collects unless the partnership modifies it.
The adjustment-year partners bear the tax even if they had nothing to do with the reviewed year. A new partner can effectively subsidize a former partner who left the deal.

Modification: Bringing the IU Down to Reality

Section 6225(c) lets the PR request modifications within 270 days of the NOPPA. Common modifications:

Lower-rate modification. If a partner would be taxed at less than 37 percent (e.g., C corp at 21 percent, or an individual in a lower bracket), the partnership can request the lower rate. This requires the partner to amend their reviewed-year return and pay any actual tax owed.
Tax-exempt partner modification. A partner that is a tax-exempt entity (a pension fund, university endowment, etc.) takes their share of the adjustment out of the IU calculation entirely.
Amended-return modification. Reviewed-year partners file amended returns (or use the streamlined "pull-in" procedure) reporting their share of adjustments and paying the actual tax. Their share comes out of the IU base.
Closing agreement modification. Used for special situations like nonresident alien partners.

Modifications are powerful but require active partner cooperation within tight deadlines. They are not automatic — the PR has to ask, and partners have to respond. Provisions in the operating agreement that require partners to cooperate with modification requests are not optional once you take BBA seriously.

The Push-Out Election: Section 6226

If modification still leaves an unacceptable IU, the PR can elect under Section 6226 to push out the adjustments to the reviewed-year partners. This:

Removes the imputed underpayment from the partnership (the partnership pays $0 of IU).
Allocates each reviewed-year partner's share of the adjustments back to that partner.
Requires each reviewed-year partner to compute their actual share of tax for the reviewed year and all intervening years (their "additional reporting year" tax), and pay it.
Adds a 2-percentage-point interest premium above the normal underpayment rate — the cost of pushing out.

The election is made within 45 days of the FPA. Then the partnership has 60 days from when the audit matters become final to:

Furnish each reviewed-year partner with a Form 8986, "Partner's Share of Adjustment(s) to Partnership-Related Item(s)."
File with the IRS a Form 8985, "Pass-Through Statement — Transmittal/Partnership Adjustment Tracking Report," along with copies of the Forms 8986. Forms 8985 and 8986 were revised in December 2024 with an "as corrected" column and updated headings, and the IRS requires electronic submission for BBA partnerships.

Each Form 8986 recipient who is themselves a pass-through (an upper-tier partnership, an S corporation, a trust) faces their own choice: pay the resulting IU at their level, or push out further. Push-outs can cascade up the chain.

When push-out is the right call:

The IU rate (37 percent) overstates reality and modification cannot fully fix it.
The reviewed-year partners are still around, solvent, and can pay.
The partnership's adjustment-year partners include new arrivals who would otherwise unfairly bear the tax.

When push-out is the wrong call:

The reviewed-year partners are dispersed, gone, or difficult to track.
The 2-percent interest premium exceeds what modification would have saved.
The partnership has reserves and the IU is manageable.

Form 8082: Fixing Your Own Mistakes Before the IRS Does

The other big BBA mechanism partners overlook is Form 8082, "Notice of Inconsistent Treatment or Administrative Adjustment Request (AAR)."

Form 8082 has two uses:

Use 1: Inconsistent treatment. A partner who believes their K-1 is wrong and reports differently on their personal return must file Form 8082 disclosing the inconsistency. Failure to file does not just create the inconsistency problem — it gives the IRS the right to make a math-error-style correction to your return without going through the usual audit procedures.

Use 2: Administrative Adjustment Request. This is the BBA version of an amended partnership return. Under BBA, partnerships cannot file an amended Form 1065 in the conventional sense. Instead, they file an AAR within three years of the later of the original return filing date or the original due date.

Filing an AAR:

Submit a revised Form 1065 marked "Amended Return."
Attach Form 8082 identifying every change.
Compute the resulting IU using the seven-step Section 6225(b) process. The instructions to Form 8082 and Form 1065-X require the partnership to attach this computation, even when the IU is zero or negative. There is no prescribed form for the calculation itself, but it must be present.
If the IU is positive and the partnership is not electing AAR push-out, pay the IU plus interest with the AAR.
If electing AAR push-out, attach Form 8985 and Forms 8986 with the AAR, and furnish Forms 8986 to the partners on the same date the AAR is filed.

A positive-IU AAR without push-out is the simplest path, but it again means current-year partners bear the cost. An AAR push-out shifts the impact back to the reviewed-year partners. The 60-day clock that applies to audit push-outs does not apply to AAR push-outs — the Forms 8986 go out with the AAR itself.

Common AAR triggers:

Math errors discovered after filing.
Missed elections (Section 754 step-up, for example).
Newly identified deductions or credits.
Reclassification of items that were originally reported wrong.

Practical Errors That Burn Partnerships

A few recurring problems show up in BBA practice:

Naming a junior staff member as PR. The PR has binding authority over millions of dollars of tax exposure. This is not a clerical role. Senior management, outside counsel, or a designated entity controlled by the partnership is the right answer.

Not updating the PR after personnel changes. When a PR leaves the firm or sells out, partnerships often forget to designate a successor. The IRS will treat the original designation as still binding until properly changed.

Letting the elect-out deadline pass without checking eligibility. Schedule B-2 must be filed with a timely original return. There is no late election. Partnerships that intended to elect out but missed the filing are stuck with BBA for the whole year.

Trusts as partners. A grantor trust where a single individual is treated as the owner is an eligible partner for elect-out, but most other trusts are not. Estate planning structures routinely fail elect-out for this reason.

Ignoring tiered structures. A partnership with a partnership as a partner cannot elect out, period. And a push-out from an upper-tier partnership creates a chain of pass-through reporting that has to be handled within statutory windows at every level.

Treating the operating agreement as boilerplate. The PR clause is one of the most consequential provisions in the document. Standard form agreements often grant unrestricted PR authority — meaning the named PR can settle the audit, agree to extend the statute of limitations, or decline to push out, all without consulting the other partners.

Recordkeeping That Actually Helps

The arithmetic of BBA — particularly modification and push-out — depends on knowing exactly what each partner's share of each adjustment looks like in each year. That gets harder the more years pass, the more partners come and go, and the more tiered the structure.

Practical record practices that make BBA survivable:

Keep a per-partner ledger of every K-1 item, every contribution, every distribution, and every basis adjustment, year by year. Capital accounts under tax-basis reporting are the floor — you actually need more.
Preserve partner contact information indefinitely. A reviewed-year partner who left in 2023 may still be on the hook for a push-out in 2027. The partnership needs to be able to find them.
Document PR designation and any consultations with partners during an audit. The PR's authority is broad, but a paper trail of consultation is what insulates the PR (and the partnership) from later disputes.
Reconcile book and tax figures at the partner level annually so that an unexpected audit does not begin with a forensic accounting exercise.

Accurate, version-controlled bookkeeping is not a luxury for BBA partnerships. It is the foundation on which every modification request, push-out calculation, and AAR filing is built. When the IRS asks for a specific partner's share of a 2022 depreciation adjustment in 2027, the partnership that has clean per-partner records answers in days; the partnership that does not spends months reconstructing.

A Concrete Example

Consider a real estate LLC with five members. In 2024, the LLC claimed $1.5 million of bonus depreciation on a building improvement. In 2027 the IRS audits and disallows $600,000 of it. The members in 2024 were Alex, Beth, Cal, Dee, and Eve, each at 20 percent. In 2027 Eve has been bought out and replaced by Finn.

Default IU. The $600,000 positive adjustment is multiplied by 37 percent: $222,000 of imputed underpayment, paid by the LLC in 2027. Finn — who joined a year ago — bears a 20 percent share through his interest in the LLC. Eve, who actually benefited from the depreciation, pays nothing.

Modification. All four remaining original members and Finn agree to amend their 2024 returns. Each member's actual marginal rate averages 32 percent. Eve, however, refuses to cooperate. The partnership modifies the IU for the four cooperating members (their actual tax at 32 percent rather than 37 percent), but Eve's $120,000 share stays in the IU at 37 percent. The total IU drops, but Finn still subsidizes part of Eve's share.

Push-out. The PR elects push-out within 45 days of the FPA. Within 60 days of finality, the partnership issues a Form 8986 to each 2024 member (including Eve), files Form 8985 with the IRS, and the LLC owes $0 of IU. Each member, including Eve, computes their own 2024 additional tax and pays it (with a 2-percent interest premium) on their next return. Finn pays nothing because he was not a 2024 member.

This is the heart of why push-out exists. It restores fairness when ownership has changed.

When to Bring in a Specialist

BBA audits do not lend themselves to do-it-yourself defense. Specific situations that almost always warrant outside counsel or a tax controversy CPA:

A NAP has been issued and modification or push-out decisions are pending.
The partnership has tiered ownership and a push-out from an upper tier is contemplated.
The 270-day modification window is open and partner cooperation is uneven.
The 90-day Tax Court petition window after the FPA is approaching.
The partnership is contemplating an AAR with a positive IU and considering AAR push-out.

The deadlines are short, the forms are technical, and a wrong decision at any of these milestones can lock in a tax position that is hard to undo.

Keep Your Partnership Records Audit-Ready

BBA changed who pays the tax when a partnership is audited, but it did not change one underlying truth: partnerships that can answer detailed per-partner questions quickly are partnerships that come out of audits in one piece. Beancount.io offers plain-text, version-controlled accounting that gives partnerships a transparent, partner-by-partner ledger that travels well across years, partners, and audits — no proprietary database, no vendor lock-in, no surprises when the NOPPA arrives. Get started for free and see why developers and finance professionals are switching to plain-text accounting.

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