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Form 6478: Biofuel Producer Credit
IRS Form 6478 is used to calculate the Section 40 second‑generation biofuel producer credit for tax years beginning after 2017. Partnerships, S corporations, cooperatives, estates and trusts must file it, and the credit is valued at $1.01 per gallon.
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IRS Form 6478 - Biofuel Producer Credit
IRS Form 6478 is used to calculate the Section 40 second‑generation biofuel producer credit for tax years beginning after 2017. Partnerships, S corporations, cooperatives, estates and trusts must file it, and the credit is valued at $1.01 per gallon.
Risk Radar
Scan points- 1Missing the $1.01 per‑gallon recapture tax triggers a tax liability.
- 2Failing to enter the required SB registration number on the form.
- 3Omitting the number of gallons on line 1 or not applying the $1.01 per‑gallon rate.
- 4Not reporting credit amounts from Schedule K‑1 or Form 1099‑PATR on line 3.
- 5Filing Form 6478 when not required, such as an individual whose only credit source is a partnership.
Plain English
Form 6478 lets eligible entities claim a credit for each gallon of second‑generation biofuel they sell or use. The credit equals $1.01 per gallon. The form also reports any credit allocations from partnerships, S corporations, estates, trusts, or cooperatives.
Submission Date
- Filing date: 2023-10-26 22:10:20
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when you need to figure your section 40 second‑generation biofuel producer credit for tax years beginning after 2017 and you are a partnership, S corporation, cooperative, estate, or trust.
- Do not use it when you are an individual or other taxpayer whose only source for the credit is a partnership, S corporation, cooperative, estate, or trust.
- Check Form 6251 instead when you must adjust the credit for alternative minimum tax purposes.
Form selector
Use this form or another form?
You are subject to the alternative minimum tax and need to exclude the credit from AMT income
The credit must be subtracted from AMT taxable income
✓ Confirm the credit is entered on the appropriate line of Form 6251
You are an estate or trust subject to passive activity rules
Passive activity credit limitations affect the amount you can allocate
✓ Verify passive credit calculations on Form 8582‑CR
You are a cooperative allocating credit to patrons
Corporate passive activity loss and credit limits determine the allowed credit
✓ Complete Form 8810 to determine the allowed credit
Deadline or filing window
The credit may be claimed or the election to forgo it must be made within three years after the due date of the return (without regard to extensions). An amended return can be filed within six months of the due date (excluding extensions) to make a late election. No additional extension is provided beyond these periods.
Checklist
What you need before filling it out
Line 1 – SB registration number
IRS SB registration number · Form 637 and Pub. 510
Line 2 – Credit amount calculation
Number of gallons sold or used and rate $1.01 per gallon · Form 6478 itself
Line 3 – Credits from partnerships, S corporations, cooperatives, estates, trusts
Schedule K‑1 (Form 1065) box 15 code 1 or Schedule K‑1 (Form 1120‑S) box 13 code 1 · Schedule K‑1
Line 3 – Passive activity credit carryforwards for cooperatives
Form 8810 calculations · Form 8810
Line 3 – Passive activity credit carryforwards for estates/trusts
Form 8582‑CR calculations · Form 8582‑CR
Before you submit
- 1Verify the SB registration number is entered on line 1
- 2Calculate the credit on line 2 using gallons sold or used multiplied by $1.01
- 3Enter any partnership, S corporation, cooperative, estate, or trust credits on line 3
- 4Add lines 2 and 3 and place the total on line 4
- 5Confirm the fuel meets qualified second‑generation biofuel definitions
- 6Ensure the credit is not claimed for fuel sold or used after 2024 unless extended
- 7Sign the return if a signature is required
- 8Attach Form 6478 to the appropriate tax return
- 9Include the form in the filing package before mailing or e‑filing
- 10Retain supporting documentation for gallons and registration
How to file this form
- 1Gather documentation of fuel gallons sold or used and your IRS SB registration number
- 2Complete line 1 with the registration number and calculate line 2 credit
- 3Enter partnership, S corporation, cooperative, estate, or trust credits on line 3 and compute line 4 total
- 4Attach Form 6478 to the tax return
- 5Submit the return (mail or e‑file) and keep the acknowledgment as proof of filing
Known limitations
- 1The credit cannot be claimed for fuel sold or used after 2024 unless the credit is extended again
- 2Fuel with more than 4 % water and sediment, ash content over 1 %, or acid number greater than 25 is excluded from the credit
- 3Only partnerships, S corporations, cooperatives, estates, and trusts are required to file this form; other taxpayers are not required if their only source is those entities
- 4If you are subject to the alternative minimum tax, the credit is excluded from AMT income and must be reported on Form 6251 or Schedule I (Form 1041)
- 5Form 6478 and its instructions will not be updated annually; updates occur only when necessary
Field map
Compact field-by-field guide
General Info
2 items
Full legal name and taxpayer identification number (SSN or EIN).
Current mailing address.
Details
2 items
Complete all applicable sections of this form according to the official IRS instructions.
Enter the relevant dollar amount if this form involves tax calculation.
Certification
1 items
Read and acknowledge any certifications required by this form.
Signatures
1 items
Sign and date. Unsigned forms cannot be processed.
Almost done reviewing the fields?
Fillable formOpen in Editor->The form revision is January 2020, and the instructions are Rev. October 2023; the source directs users to www.irs.gov/Form6478 for the latest information. The credit is extended only for fuel sold or used before 2025 and cannot be claimed for fuel after 2024 unless extended again.
What changed or needs a fresh check
- Edition date — confirm the form revision reads January 2020
- Instructions revision — confirm the instructions are Rev. October 2023
- Latest info page — confirm the form points to www.irs.gov/Form6478 for updates
- 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
- 1Keep a copy of the filed Form 6478 with your tax records
- 2Retain supporting documents (fuel gallons, registration) for at least three years
- 3Monitor IRS notices for any adjustments to the credit amount
- 4If an error is discovered, file an amended return with a corrected Form 6478
- 5Await the IRS confirmation of credit acceptance on your tax transcript
- 6Update your records if the credit is later extended beyond 2024
Sources
- SRCInstructions p.1 — Form 6478 is used to figure section 40 biofuel producer credit for tax years beginning after 2017
- SRCInstructions p.1 — Partnerships, S corporations, cooperatives, estates, and trusts must file this form
- SRCInstructions p.1 — All other taxpayers aren’t required to complete or file this form if their only source is a partnership, S corporation, cooperative, estate, or trust
- SRCInstructions p.1 — The credit is extended for fuel sold or used before 2025 and must not be claimed for fuel after 2024 unless extended again
- SRCInstructions p.2 — To claim the credit on line 1 you must be registered with the IRS and enter your SB registration number
- SRCInstructions p.2 — Line 3 entries come from Schedule K‑1 (Form 1065) box 15 code 1 or Schedule K‑1 (Form 1120‑S) box 13 code 1
- SRCInstructions p.2 — Passive activity credit carryforwards for cooperatives require Form 8810
- SRCInstructions p.2 — Passive activity credit carryforwards for estates/trusts require Form 8582‑CR
- SRCInstructions p.2 — If subject to AMT, the amount must be subtracted on Form 6251 or Schedule I (Form 1041)
- SRCForm p.1 — The credit rate is $1.01 per gallon
- SRCForm p.1 — Attach Form 6478 to your tax return
Common confusion points
Do I need to file if I’m an individual?
The form is required only for partnerships, S corporations, cooperatives, estates, and trusts.
→ Verify your entity type before completing the form
Can I claim the credit for fuel sold in 2025?
The credit is extended only for fuel sold or used before 2025 and not after 2024 unless extended again.
→ Confirm the sale year is 2024 or earlier
What if my fuel contains 3 % water?
The exclusion threshold is more than 4 % water and sediment.
→ Ensure water content does not exceed 4 %
How do I report the credit on an AMT return?
The credit must be subtracted from AMT taxable income.
→ Include the amount on the appropriate line of Form 6251 (or Schedule I for estates/trusts)
Do I need to include partnership credits on my individual return?
Partnership and S corporation credits flow through via Schedule K‑1.
→ Use the amounts from Schedule K‑1 boxes as instructed
Is the $1.01 rate always applied?
The form lists a rate of $1.01 per gallon for the credit.
→ Multiply gallons sold or used by $1.01 to compute the credit
Workflow map
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Questions about IRS Form 6478
What is IRS Form 6478 used for?
Form 6478 lets eligible entities claim a credit for each gallon of second‑generation biofuel they sell or use. The credit equals $1.01 per gallon. The form also reports any credit allocations from partnerships, S corporations, estates, trusts, or cooperatives.
Who must file IRS Form 6478?
Partnerships, S corporations, cooperatives, estates, and trusts must file IRS Form 6478 to claim the biofuel producer credit.
What information does IRS Form 6478 require?
The form gathers the gallons of qualified biofuel sold or used, multiplies them by $1.01 per gallon to compute the credit, and records any credit amounts received from Schedule K‑1 or Form 1099‑PATR.
How do I complete IRS Form 6478?
Enter the total gallons of qualified biofuel on line 1 and multiply by $1.01 to calculate the credit. Report the credit amount on line 2 as other income, and list any credit allocations from Schedule K‑1 or Form 1099‑PATR on line 3. Partnerships and S corporations also complete line 4 on Schedule K, while cooperatives may allocate portions on line 5. Provide the IRS SB registration number and attach the completed form to the appropriate tax return.
What happens if IRS Form 6478 is filed incorrectly?
If the fuel is not used as a qualified second‑generation biofuel, the taxpayer must pay a recapture tax of $1.01 per gallon on Form 720, creating a tax liability.
Do I need to file if I’m an individual?
The form is required only for partnerships, S corporations, cooperatives, estates, and trusts. Verify your entity type before completing the form
Can I claim the credit for fuel sold in 2025?
The credit is extended only for fuel sold or used before 2025 and not after 2024 unless extended again. Confirm the sale year is 2024 or earlier
What if my fuel contains 3 % water?
The exclusion threshold is more than 4 % water and sediment. Ensure water content does not exceed 4 %
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