The Schedule A (Form 8978) Guide: Schedule of Adjustments

Introduction – What Is Schedule A (Form 8978)?

Schedule A (Form 8978), titled Partner’s Additional Reporting Year Tax (Schedule of Adjustments), is a supporting federal tax schedule administered by the Internal Revenue Service (IRS) and the U.S. Department of the Treasury. It serves as an essential companion worksheet to Form 8978 under Internal Revenue Code (IRC) Section 6226.

While the main Form 8978 reports your final tax addition, statutory interest, and penalties, Schedule A is the mathematical engine behind the calculation. Partners use Schedule A to recalculate their prior-year taxable income and tax liabilities based on audit adjustments pushed out by a partnership under the centralized partnership audit regime.

Purpose of the Form – Why Does Schedule A (Form 8978) Exist?

Under the Bipartisan Budget Act of 2015 (BBA), when an IRS audit results in adjustments to a partnership’s prior tax return, the partnership can make a “push-out election.” This election passes the tax liability down to the individuals and entities who were partners during the audited year (the “reviewed year”) via Form 8986.

The tax code does not require partners to file amended returns (like Form 1040-X) for those past years. Instead, Schedule A (Form 8978) solves the accounting challenge by providing a structured, step-by-step worksheet where you recompute your past tax liabilities for the reviewed year and any affected intervening years. The net tax changes calculated on Schedule A flow directly onto Form 8978 to be paid on your current-year tax return.

Who Needs to File This Form?

You must complete and attach Schedule A (Form 8978) if you are required to file Form 8978. Filing is mandatory for taxpayers who satisfy all of the following criteria:

• Received Form 8986: You are a partner who received Form 8986 reflecting audit adjustments from a BBA partnership that made a Section 6226 push-out election or filed an Administrative Adjustment Request (AAR).
• Ultimate Taxpayer Status: You are an individual, C corporation, trust, or estate that pays income tax directly on your distributive share of partnership income.
• Filing Form 8978: You are preparing your federal income tax return for the reporting year (the year you received Form 8986).

Every Form 8978 filed with the IRS must include an accompanying Schedule A to substantiate the numbers reported on Lines 1 and 2 of the main form.

Who Is Exempt / Not Required to File?

Many partners will never need to complete Schedule A (Form 8978). You are exempt or not required to submit this schedule if:

• No Form 8986 Received: You did not receive a Form 8986 from any partnership during the tax year.
• Entity-Level Settlement: The audited partnership elected to pay the imputed underpayment itself at the partnership level rather than pushing the liability out to partners.
• BBA Opt-Out Partnerships: The partnership made a valid election under Section 6221(b) to opt out of the centralized BBA audit rules.
• Pass-Through Push-Out Entities: You are an intermediate pass-through entity (such as an upper-tier partnership) that chooses to push the adjustments further out to your own partners using Form 8985 rather than paying the tax yourself.

When to File Schedule A (Form 8978)

Schedule A (Form 8978) is an annual schedule that must accompany Form 8978 on your primary federal income tax return for the reporting year. The reporting year is the partner’s tax year that includes the date Form 8986 was furnished by the partnership.

The filing deadlines match your standard annual income tax return due dates, including approved extensions:

• Individual Partners (Form 1040): Typically April 15 (or October 15 with an extension).
• Corporate Partners (Form 1120): Typically April 15 (or October 15 with an extension).
• Trusts and Estates (Form 1041): Typically April 15 (or September 30 with an extension).

Where and How to File

Schedule A (Form 8978) cannot be filed as an isolated document; it must be attached directly behind parent Form 8978 and submitted as part of your overall federal income tax return package.

Most commercial and professional tax preparation software platforms support Schedule A (Form 8978) and will electronically transmit it alongside Form 8978 and Form 1040 or Form 1120. If submitting a physical paper tax return, place Schedule A directly behind Form 8978 and mail the complete tax packet to the designated IRS address as per instructions for your primary return.

Step-by-Step Instructions to Fill Schedule A (Form 8978)

Schedule A requires you to recalculate your tax liability for two categories of tax years: the first reviewed year (the past year audited by the IRS) and any intervening years (years between the reviewed year and the current year affected by carryover adjustments).

Header Information

Enter the partner’s full legal name and Taxpayer Identification Number (Social Security Number, ITIN, or Employer Identification Number) exactly as shown on parent Form 8978 and your primary return.

Recomputation Table Breakdown

Calculation Step	Form Focus	Detailed Filing Directions
Tax Year Identifier	Tax Year Ending Date	Enter the tax year ending date (MM/DD/YYYY) for the reviewed year in Column A, and separate intervening tax years in subsequent columns.
Baseline Taxable Income	Originally Reported Income	Enter your taxable income as originally reported on your return for that year, or as previously adjusted by the IRS or prior amended returns.
Net Adjustments	Form 8986 Allocations	Enter your distributive share of adjustments from Form 8986 (such as adjustments to ordinary income, capital gains, Section 179 expenses, or deductions).
Recomputed Taxable Income	Adjusted Income Base	Combine your baseline taxable income with the net adjustments to determine your recomputed taxable income for that specific tax year.
Recomputed Tax Liability	Recalculated Chapter 1 Tax	Recompute your regular income tax, alternative minimum tax (AMT), and net investment income tax (NIIT) using the tax rates in effect for that historical year.
Net Tax Change	Yearly Increase or Decrease	Subtract your previously determined tax liability from your recomputed tax liability. The reviewed year total carries to Form 8978, Line 1; the intervening years total carries to Form 8978, Line 2.

Required Documents and Information Needed Before Filling

Because Schedule A requires recalculating past tax filings, assemble the following financial records before beginning your calculations:

• Form 8986: The partner statement issued by the partnership showing the exact dollar amounts and tax character of all audit adjustments.
• Filed Reviewed Year Return: A complete copy of your filed federal income tax return (Form 1040, Form 1120, or Form 1041) for the audited year.
• Filed Intervening Year Returns: Copies of your filed tax returns for all tax years between the reviewed year and the reporting year.
• Carryforward Tracking Ledgers: Workpapers showing historical carryover balances (such as Net Operating Losses, capital loss carryforwards, passive activity loss carryovers, and general business credit carryforwards).

Common Mistakes to Avoid

Schedule A involves complex multi-year calculations. Watch out for these frequent mistakes:

• Omitting Schedule A from Form 8978: Submitting Form 8978 with summary totals on Lines 1 and 2 without attaching Schedule A. The IRS will reject your Form 8978 without the supporting schedule.
• Ignoring Intervening Years: Failing to recompute intervening years. If an audit adjustment increases your 2021 income, and that adjustment reduces a loss carried into 2022 and 2023, you must recalculate all three tax years on Schedule A.
• Filing an Amended Return Instead: Preparing a Form 1040-X for the reviewed year. Under the BBA push-out rules, you are prohibited from amending the reviewed year; all adjustments must be calculated on Schedule A and reported on Form 8978.
• Using Current-Year Tax Rates: Calculating prior-year tax changes using current tax brackets. You must use the tax brackets, exemptions, and standard deductions that were legally in effect for the historical year being recalculated.
• Mismatched Form 8986 Numbers: Entering adjustments that contradict the figures reported to the IRS on the partnership’s copy of Form 8986.

Penalties for Non-Filing or Errors

Failing to properly complete and attach Schedule A carries significant administrative and financial penalties:

• Disallowance of Adjustments: The IRS will reject your Form 8978 if Schedule A is missing or incomplete, resulting in immediate tax deficiency notices.
• Accuracy-Related Penalties (IRC Section 6662): Understating your recomputed tax on Schedule A can trigger a 20 percent penalty on the underpaid tax amount.
• Failure-to-Pay Penalties: Standard failure-to-pay penalties under Section 6651 apply to any unpaid reporting year tax resulting from incorrect Schedule A math.
• Compounding Interest Under Section 6621: Push-out adjustments are subject to an elevated statutory interest rate running from the original due date of the reviewed year return until paid.

Related Forms and Schedules

Schedule A operates within the specialized BBA partnership audit reporting suite:

• Form 8978: Partner’s Additional Reporting Year Tax (the parent return where Schedule A totals flow).
• Form 8986: Partner’s Share of Adjustment(s) to Partnership-Related Item(s) (the source statement from the partnership).
• Form 8985: Pass-Through — Statement of Transmittal/Calculation (used by tiered partnerships).
• Form 1040 / Form 1120 / Form 1041: Primary income tax returns where Form 8978 and Schedule A are attached.
• Schedule 2 (Form 1040): Additional Taxes (where reporting year tax increases are transferred).

Frequently Asked Questions

Why do I need Schedule A if I already have Form 8978?

Form 8978 only shows the final summary totals, interest, and penalties. Schedule A provides the IRS with the transparent, line-by-line mathematical proof showing how you recomputed your prior-year tax liabilities.

What are “intervening years”?

Intervening years are the tax years between the audited year (the reviewed year) and the year you file Form 8978 (the reporting year). You must include an intervening year on Schedule A if an audit adjustment changes carryover deductions or credits into that year.

What happens if Schedule A calculations result in a net tax decrease?

If your recomputed tax liability is lower than what you originally paid, the net decrease transfers to Form 8978, Line 4. It acts as a nonrefundable credit that reduces your reporting year tax liability to zero, but it cannot generate a direct cash refund.

Do I have to recalculate the Alternative Minimum Tax (AMT) on Schedule A?

Yes. If the partnership adjustments alter items that affect AMT (such as depreciation adjustments or private activity bond interest), you must recalculate your AMT liability for that historical year.

Can I submit multiple copies of Schedule A?

Yes. If a partnership pushes out adjustments covering multiple reviewed years, or if you receive Forms 8986 from multiple partnerships, you can attach additional copies of Schedule A to accommodate all affected tax years.

Do I need to send a copy of Schedule A to the partnership?

No. Schedule A is submitted exclusively to the IRS alongside Form 8978 and your personal or corporate income tax return. You do not provide a copy to the partnership.

Conclusion – Key Takeaways Summarized

Schedule A (Form 8978) is the mandatory calculation engine for partners reporting BBA partnership push-out adjustments. It replaces the cumbersome process of filing amended tax returns by allowing you to recompute prior-year liabilities within a single standardized schedule.

To avoid tax notices and penalties, gather your past returns immediately upon receiving Form 8986, recalculate reviewed and intervening years using historical tax rates, ensure your net changes match Lines 1 and 2 of Form 8978, and attach Schedule A directly to your annual tax return.