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Form 8978: Partner's Additional Reporting Year Tax
IRS Form 8978 is used by partners (except pass‑through partners) who receive a Form 8986 to calculate additional reporting‑year tax and any related penalties, attaching it to their return. A $5,000 increase triggers the section 6662 penalty.
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IRS Form 8978 - Partner's Additional Reporting Year Tax
IRS Form 8978 is used by partners (except pass‑through partners) who receive a Form 8986 to calculate additional reporting‑year tax and any related penalties, attaching it to their return. A $5,000 increase triggers the section 6662 penalty.
Risk Radar
Scan points- 1Failing to report penalties on line 15 when they apply can trigger the $5,000 penalty.
- 2Attaching Form 8978 to the income‑tax return is omitted, so the additional tax is not reported.
- 3Reporting the wrong reporting year on the form, causing the tax to be applied to an incorrect tax year.
- 4Leaving line 15 blank when penalties apply, which can trigger the $5,000 section 6662 penalty.
- 5Incorrectly calculating line 13 by not subtracting line 12 from line 11, leading to an inaccurate tax increase.
Plain English
When a partnership is examined and sends a Form 8986, partners that are not pass‑through entities must figure out any extra tax caused by that adjustment. They fill out Form 8978, add the extra tax, any penalties, and send it with their normal tax return.
Submission Date
- Filing date: 2024-12-31 22:12:15
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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Glossary Terms
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What this form is for
- Use this form when a partner (not a pass‑through partner) receives a Form 8986 and must report additional reporting‑year tax.
- Do not use it when the partner is a pass‑through entity such as a partnership or S corporation.
- Check Form 3800 instead when you need to report changes to credits.
Form selector
Use this form or another form?
Partner filing individual income tax return (Form 1040)
Form 8978 line 14 must be reported on the appropriate line of the 2024 Form 1040
✓ Verify the correct line on Form 1040
Credit changes not reported on Form 8978
Partners do not report credit changes on Form 8978; they use Form 3800
✓ Confirm credit changes are handled on Form 3800
Pass‑through entity receiving Form 8986
Pass‑through partners follow Forms 8985 and 8986 instructions, not Form 8978
✓ Confirm you are a pass‑through partner
Deadline or filing window
The filing requirement is triggered when a partner receives a Form 8986. The completed Form 8978 must be attached to the partner’s income‑tax return, which is due April 15 of the year after the reporting year. Extensions are not permitted; the deadline applies regardless of any extension to the underlying return.
Checklist
What you need before filling it out
Name of partner(s)
Partner’s legal name · Form 8978 top line
Partner tax ID number
Employer Identification Number or SSN · Form 8978 top line
Source of review year adjustments
Indicate BBA Audit or AAR Filing · Form 8978 field "Source of review year adjustments"
Tax Year Ended (a)
Tax year date (MM/DD/YYYY) · Part I column (a)
Total income per original return (1a)
Amount from original return · Line 1a
Before you submit
- 1Enter partner name and tax ID number on Form 8978
- 2Select the correct source of review year adjustments
- 3Fill all four Tax Year Ended columns (a)‑(d)
- 4Enter total income per original return on line 1a
- 5Enter adjustments to income from Schedule A on line 1a b
- 6Combine lines 1a and 1a b to compute corrected income on line 2
- 7Attach Form 8978, Schedule A (Form 8978), and calculation statements to the tax return
- 8Include tax and interest in the payment accompanying the return
- 9Include any applicable penalty in the payment
How to file this form
- 1Gather Form 8986 and partnership adjustment details
- 2Complete Form 8978 fields including name, ID, source, tax years, income, and adjustments
- 3Calculate corrected income by combining lines 1a and 1a b
- 4Attach Schedule A (Form 8978) and calculation statements to the federal income tax return
- 5File Form 8978 with the partner’s reporting‑year tax return
- 6Submit payment covering tax, interest, and any penalty
- 7Retain a copy of the filed Form 8978 and supporting documents
Known limitations
- 1Form 8978 does not apply to pass‑through partners such as partnerships or S corporations.
- 2Form 8978 is not used to report carryforward credit amounts after the first affected year; those are reported on Form 3800.
- 3Form 8978 does not report changes to credits shown on the pushout statement; those changes are excluded from this form.
Field map
Compact field-by-field guide
Entity Info
1 items
Name and taxpayer ID of the entity claiming the credit.
Credit Info
1 items
Type of credit or incentive being claimed.
Calculation
2 items
The base amount used to calculate the credit.
Calculated credit amount after applying formulas and limitations.
Certification
1 items
Detailed breakdown supporting the credit calculation.
Signatures
1 items
Sign and date the form.
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Fillable formOpen in Editor->Form 8978 is Rev. January 2023; the instructions are Rev. December 2024 and point to www.irs.gov/Form8978 for the latest information. What’s New: adjustments from multiple Forms 8986 can be reported on one Schedule A when from the same source type.
What changed or needs a fresh check
- Edition date — confirm Rev. January 2023 as shown on Form 8978
- Fee — Not stated in the official source
- Mailing address — Not stated in the official source
- Signature — Not stated in the official source
Quick Facts
Downloads
After you file
- 1Retain the completed Form 8978, Schedule A, and all supporting calculation statements with the tax return records.
- 2Keep the retained documents for at least three years after the filing year in case of IRS review.
- 3Expect the IRS to process the attached Form 8978 together with the partner’s federal income tax return.
- 4If an error is discovered, file an amended Form 8978 with corrected amounts and attach a revised Schedule A.
- 5Confirm that the payment accompanying the partner’s Form 1040 includes both the additional tax and any applicable interest.
Sources
- SRCInstructions p.1 — Partners other than pass‑through partners use Form 8978 and Schedule A to calculate tax from adjustments shown on Forms 8986.
- SRCInstructions p.1 — These partners do not report on Form 3800 any changes to credits reported on the pushout statement.
- SRCInstructions p.1 — Carryforward credit amounts after the first affected year are reported on Form 3800.
- SRCInstructions p.2 — Every partner (except pass‑through partners) that receives a Form 8986 must file Form 8978.
- SRCInstructions p.2 — A reviewed year partner or affected partner must file Form 8978 with a federal income tax return for the partner’s reporting year.
- SRCInstructions p.3 — The reduction in tax shown in column (b) is included in total increase to tax on line 14 but not in interest calculation.
- SRCInstructions p.3 — Bill must attach Form 8978, Schedule A, and calculation statements to the Form 1040 filing.
- SRCInstructions p.4 — If corrected taxable income differs, include a separate statement and enter corrected amount on line 5.
- SRCInstructions p.4 — If corrected income tax differs, include a separate statement and enter corrected amount on line 6.
- SRCInstructions p.4 — If AMT applies, include a separate statement and enter corrected amount on line 7.
Common confusion points
Do I need to file Form 8978 if I am a partnership?
Partnerships are pass‑through partners, which are excluded from filing.
→ Verify that you are not a pass‑through entity before filing.
Where do I report the carryforward credits after the first affected year?
The form’s purpose is only for the first affected year and intervening years; carryforwards belong on Form 3800.
→ Use Form 3800 for any credit carryforwards.
Is the reduction shown in column (b) added to the interest calculation?
The reduction is included in total increase to tax but excluded from interest calculation.
→ Ensure interest is calculated without the column (b) reduction amount.
Do I attach my Section 469 and Section 199A schedules?
The instructions state they should be attached with the Form 8978 filing.
→ Include those schedules with the filing packet.
What line on Form 1040 should I enter the additional tax?
The additional reporting year tax from line 14 of Form 8978 is entered on the appropriate line of Form 1040.
→ Locate the line on Form 1040 that captures additional tax and enter the amount from line 14.
If I receive multiple Forms 8986, do I file separate Form 8978s?
Each audited or AAR‑related adjustment requires its own Form 8978, with previously reported amounts carried on lines 1a, 3a, 9a, 12.
→ File a new Form 8978 for each set of adjustments and reference prior amounts on the specified lines.
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Amended Form 8978 – file to correct any mistakes on the original filing.
Questions about IRS Form 8978
What is IRS Form 8978 used for?
When a partnership is examined and sends a Form 8986, partners that are not pass‑through entities must figure out any extra tax caused by that adjustment. They fill out Form 8978, add the extra tax, any penalties, and send it with their normal tax return.
Who must file IRS Form 8978?
Every partner (except pass‑through partners) that receives a Form 8986 from a pass‑through entity must file IRS Form 8978.
What information does IRS Form 8978 require?
The form reports the increase or decrease in tax (lines 13‑14), any applicable penalties (line 15), and interest on the added tax (line 17).
When is IRS Form 8978 due?
It is due with the partner’s income‑tax return, which for a calendar‑year partner is April 15 of the following year (e.g., April 15, 2025) without regard to extensions.
How do I complete IRS Form 8978?
First compute the tax change by subtracting line 12 from line 11 and enter the result on line 13. Add the amounts in columns (a)‑(d) on line 13 to get the total additional tax on line 14. If penalties apply, list them on line 15 and attach a penalty calculation. Finally, compute interest on line 17, sign the form, and attach it to the federal income‑tax return.
What happens if IRS Form 8978 is filed incorrectly?
If the additional tax exceeds $5,000, the section 6662 substantial understatement penalty applies, and interest accrues from the original return due date.
Do I need to file Form 8978 if I am a partnership?
Partnerships are pass‑through partners, which are excluded from filing. Verify that you are not a pass‑through entity before filing.
Where do I report the carryforward credits after the first affected year?
The form’s purpose is only for the first affected year and intervening years; carryforwards belong on Form 3800. Use Form 3800 for any credit carryforwards.
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