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IRS Form 1065X (2018): Administrative Adjustment Request

Understand IRS Form 1065X (2018) for amended partnership returns and administrative adjustment requests under TEFRA and the BBA partnership audit regime.
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Published date:
October 21, 2025
Updated date:
June 4, 2026

Download the Official 2018 Form 1065-X

Download the official Form 1065-X for tax year 2018 and review each section before filling it out. Using the wrong tax year form will result in rejection — always confirm you have the 2018 version before starting.

Form 1065-X — IRS Form 1065X (2018): Administrative Adjustment Request

Tax Year 2018  ·  PDF Format

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Published date:
October 21, 2025
Updated date:
June 4, 2026

What IRS Form 1065X (2018) Is For

IRS Form 1065X (2018) is used when a partnership needs to correct information that appeared on a previously filed form, including items related to partnership income, partner allocations, or other partnership-associated items. The form applies to partnerships generally that must file an amended return or an administrative adjustment request to correct errors on a partnership return filed with the IRS. It also allows a partnership to update figures reported in the original return, ensuring the IRS receives accurate and complete information for the applicable tax year.

For step-by-step instructions on partnership amended returns and AARs, visit our IRS Form Help Center.

When You’d Use IRS Form 1065X (2018)

You would use IRS Form 1065X (2018) when your partnership must take corrective action on a previously filed return.

  • Correct errors in a partnership return: This applies when the partnership needs to correct the mistakes involving partnership income or a partner’s share that appeared on the original return.

  • File an amended return when required: This applies when a partnership must file amended returns for non-BBA partnerships to address partnership-related items that were incorrect or incomplete.

  • File an administrative adjustment request AAR: This applies to partnerships subject to either TEFRA or the centralized partnership audit regime when they must file an administrative adjustment to address adjustments requested at the entity level.

  • Respond to inconsistent treatment or incorrect allocations: This applies when direct partners reported inconsistent treatment based on a statement furnished by the partnership or when allocations require correction.

Key Rules or Details for the 2018 Tax Year

  • Understanding partnerships subject to the BBA partnership regime: This applies to tax years beginning after 2017, when the Bipartisan Budget Act established the centralized partnership audit regime, which assigns responsibility for adjustments to the partnership entity.

  • Recognizing applicable tax years and procedures: This applies to tax years beginning before 2018, when partnerships could fall under TEFRA or may qualify as non-BBAA partnerships, which affects how the adjustments are processed.

  • Designating the appropriate partnership representative or designated individual: This applies because the partnership representative or designated individual manages the administrative proceeding and has authority over all administrative adjustment requests.

  • Handling tiered partnerships and pass-through partners: This applies when a source partnership reports changes that flow through to pass-through partners in tiered alliances and must be addressed consistently.

  • Applying certain modifications to reduce imputed underpayment: This applies when the partnership makes elections or provides statements that allow specific changes to reduce the imputed underpayment calculated by the IRS.

Use our IRS Account Transcript Service to confirm processing and keep partnership records current.

Step-by-Step (High Level)

The filing process for IRS Form 1065X (2018) follows a structured sequence to ensure accurate reporting and proper submission to the IRS.

  1. Gather the original return and supporting schedules: This applies when reviewing the original return, the previously filed form, Schedule K-1, and any supporting documents detailing the partner’s share that require correction.

  2. Determine whether to file an amended return or an administrative adjustment: This applies when deciding whether the partnership must file amended returns as a non-BBA partnership or must file an administrative adjustment under TEFRA or the BBA regime.

  3. Complete the appropriate sections: This applies when entering adjustments requested, partnership-related items, and corrected information into the relevant columns of the amended form.

  4. Prepare partner-level statements if electing a push-out option: This applies when the partnership makes an election to push out adjustments to each reviewed year's partner through a pass-through statement instead of paying partnership tax at the entity level.

  5. Sign and submit the form through paper filing or electronic filing: This applies when the partnership submits the form by filing electronically, if available, or through paper filing, including any required payment by check or money order.

  6. Send the form to the IRS service center: This applies because the form must be filed with the IRS at the location where the original return was filed, and such return must include all corrected schedules and statements.

Common Mistakes and How to Avoid Them

Several recurring errors occur when partnerships file IRS Form 1065X (2018), and avoiding them helps ensure smooth processing.

  • Misidentifying the correct filing type: This mistake occurs when a partnership confuses amended partnership returns with administrative adjustment requests. To avoid this, confirm whether the entity is treated as a non-BBA partnership or is operating under the TEFRA or BBA partnerships framework.

  • Incorrect PR designation or partnership representative: This mistake occurs when the partnership fails to appoint the correct partnership representative or designated individual, and it can be avoided by updating the designation before filing.

  • Missing required pass-through statements: This mistake occurs when a partnership electing push-out fails to provide a pass-through statement to each partner for each reviewed year. To avoid this, it requires preparing and furnishing all the necessary statements before submission.

  • Not attaching supporting schedules or corrected information: This mistake occurs when documentation supporting adjustments requested is missing, and avoiding it requires assembling all schedules and statements that show how each figure was corrected.

  • Failing to include payment when tax is due: This mistake occurs when the partnership does not include payment for an imputed underpayment. To avoid it, calculate any partnership tax owed and submit a check or money order with the filing.

What Happens After You File

After an AAR is filed or an amended return is submitted using IRS Form 1065X (2018), the IRS reviews the administrative adjustment requests and verifies the corrective action requested for the adjustment year. The IRS may issue a notice requesting additional information or may accept the forms as filed if the partnership tax calculations appear accurate. If the partnership filed electronically, the IRS processes the submission in the same manner as other returns. If tax is owed, payment must be made promptly to avoid penalties and interest.

Need help filing an AAR, amending a partnership return, or navigating IRS audit procedures? Start your case review for one-on-one support from our experts.

FAQs

Can partnerships file IRS Form 1065X (2018) electronically? 

Yes, partnerships can sometimes file Form 1065X electronically when their tax software supports electronic filing for amended returns or administrative adjustment requests. However, many partnerships continue to use paper filing based on their specific filing requirements.

How does the BBA regime affect administrative adjustment requests?

The BBA regime places most adjustments at the partnership level rather than the partner level, which means that an administrative adjustment request generally results in partnership tax or modifications, rather than individual amended returns, unless the partnership elects a push-out option.

When must a partnership file an AAR instead of an amended return?

A partnership must file an AAR when it is treated as a TEFRA entity or as a BBA partnership. This requirement applies because administrative adjustment requests under these rules must be submitted at the partnership level, rather than through amended returns.

How does a push-out election work for reviewed-year partners?

A push-out election allows the partnership to send a pass-through statement to each reviewed-year partner, so that they report their share of the adjustments, which shifts responsibility from the collaboration to the reviewed-year partners.

https://www.cdn.gettaxreliefnow.com/Business%20Income%20Tax%20Forms/1065-X/Amended%20Return%20or%20Administrative%20Adjustment%20Request%20(AAR)%201065X%20-%202018.pdf

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