Form 4136 Instructions: Eligibility, Fuel Rates, and Deadlines

Form 4136 instructions come down to this: if your business bought gasoline, undyed diesel, undyed kerosene, or aviation fuel and used it for a purpose the federal excise tax was never meant to cover, you use this form to get that tax back. You complete a short eligibility section in Part I, then work through Part II line by line, matching each batch of fuel to its type, its use code, and its per-gallon credit rate. The total attaches to your annual income tax return.

Two boundaries before you start. Dyed diesel does not qualify, because no federal excise tax was charged on it in the first place. And personal use does not qualify — fueling an ATV on your own land, running a generator at your cabin, or filling a snowmobile all fall outside the credit. The one exception to the trade-or-business requirement is undyed kerosene bought for home heating, lighting, or cooking.

Part I: The Eligibility Gate

Part I runs from Line A through Line F and decides whether you can file the form at all.

Line A asks whether you owned or operated a business that used qualifying fuel for a qualifying purpose. Answer “No” and you stop there. The exception is the kerosene home-heating credit: if that is the only credit you’re claiming, answer “Yes” on Line A and skip Lines B through F.

Line D is where most mistakes happen. Enter only the Employer Identification Number the IRS issued to your business on Form SS-4. Do not put your Social Security number here, and do not copy an EIN off a 1099-MISC from a client or payer. If you don’t have an EIN, leave the line blank.

Line E is your six-digit principal business activity code. Line F asks you to describe the make, model, and type of equipment that burned most of the fuel you’re claiming.

Part II: Finding Your Line

Part II is organized by fuel type across 16 numbered lines, most with sub-lines for different uses. You’ll typically only use one or two.¹

Line 1: Nontaxable use of gasoline (sub-lines for off-highway business use, farm use, other nontaxable uses, and exports)
Line 2: Nontaxable use of aviation gasoline
Line 3: Nontaxable use of undyed diesel fuel
Line 4: Nontaxable use of undyed kerosene (other than aviation)
Line 5: Kerosene used in aviation
Lines 6–8: Sales by registered ultimate vendors of undyed diesel, undyed kerosene, and aviation kerosene
Line 11: Nontaxable use of alternative fuel (LPG, CNG, LNG, and others)
Line 14: Nontaxable use of diesel-water fuel emulsion
Line 16: Exported dyed fuel and gasoline blendstocks

Lines 6 through 8 are for registered ultimate vendors — sellers who claim the credit on behalf of qualifying customers. Filing those lines requires an active Form 637 registration.² Most farmers and small business owners claiming off-highway use do not need Form 637 registration.

Type-of-Use Codes

Every line in Part II asks for a number from the IRS Type of Use table, and the code tells the IRS exactly how the fuel was consumed. The codes you’ll see most often:³

1: On a farm for farming purposes
2: Off-highway business use (equipment not registered or required to be registered for highway use)
3: Export
4: In a boat engaged in commercial fishing
5: In certain intercity and local buses
7: In school buses transporting students and employees
8: Diesel or kerosene used other than in a train engine or highway vehicle (includes heating oil and motorboat use)
13: Exclusive use by a nonprofit educational organization
14: Exclusive use by a state, local government, or the District of Columbia

The full table runs from code 1 through code 16 in the Form 4136 instructions. Each line accepts only certain codes, so cross-check the line before you write in a number. Code 4 on a line that only permits codes 2 and 7, for example, is a filing error.

Type of use 2 — off-highway business use — is the broadest category and the one most non-farm businesses rely on. It covers generators, compressors, bulldozers, backhoes, cranes, and other equipment working private property or job sites. The disqualifier is highway registration: if the vehicle is registered or required to be registered for highway use, fuel burned in it does not qualify under code 2, even on a day it never left private land. Personal-use vehicles, commuter vehicles, minibikes, snowmobiles, and lawn equipment are also excluded.⁴

Credit Rates by Fuel

The credit amount per gallon depends on the fuel and, for some fuels, the specific use.

Gasoline: $0.184 per gallon for most nontaxable uses, which is the full federal excise tax plus a 0.1-cent Leaking Underground Storage Tank fee.⁵

Undyed diesel and undyed kerosene: $0.244 per gallon.

Aviation gasoline: $0.15 per gallon in commercial aviation (other than foreign trade), $0.193 per gallon for other nontaxable uses, and $0.194 per gallon for exports.⁶

Alternative fuels (Line 11): $0.109 per gasoline gallon equivalent for LPG and CNG, and $0.169 per diesel gallon equivalent for LNG.¹

Kerosene for home heating: $0.243 per gallon. This is the only credit on the form that doesn’t require trade or business use.

Filling In a Line

For each sub-line you use, four things go in: the type-of-use code, the number of qualifying gallons (or gallon equivalents), the credit amount, and your actual fuel cost.

The credit amount is gallons multiplied by the rate printed on that line. A farmer with gasoline used on the farm would go to Line 1b, enter type of use 1, put qualifying gallons in column (c), and multiply by $0.184. The same farmer’s undyed diesel used on the farm goes to Line 3, again with type of use 1, at $0.244 per gallon.

Column (d) asks for your actual fuel cost from your records. It’s a reasonableness check. The IRS expects the amount in column (d) to be a relatively small percentage of your total gross receipts for the activity that used the fuel.³ If your claimed fuel cost looks large next to the business income it supported, expect questions.

If you used more than one fuel, or the same fuel for more than one purpose, use a separate sub-line for each combination. A construction company burning gasoline in generators (Line 1a, type of use 2) and undyed diesel in excavators (Line 3, type of use 2) fills out both lines independently. The bottom of the form sums everything.

Where the Total Goes

Form 4136 is not filed by itself. It attaches to your annual income tax return.

Individual filers carry the total to Schedule 3, line 12, which flows to Form 1040.⁷ The credit is treated as a payment, so it can generate a refund even if you owe no income tax.

Corporate filers report it on Schedule J, line 20b of Form 1120.⁸

The Quarterly Alternative: Form 8849

If waiting for the annual return is too slow, file Form 8849 with Schedule 1 quarterly.⁹ The quarterly credit must be at least $750, either for that quarter alone or aggregated with prior quarters in the same tax year that haven’t been claimed yet.¹⁰ File during the first quarter after the quarter you’re claiming. A claim covering January through March is due by June 30. The last quarter of your tax year cannot be claimed this way; those gallons wait for Form 4136 with your annual return. Electronically filed Schedule 1 claims are typically processed within 45 days of IRS acceptance.¹¹

Records to Keep

Fuel tax credit claims fail at audit when the records don’t tie claimed gallons to actual purchases and actual qualifying use. At minimum, keep:⁴

A list of every vehicle and piece of equipment that consumed the fuel, with proof of ownership.
Fuel purchase invoices showing purchase date, gallons, supplier name and address, total paid, and the purpose the fuel was used for.
Usage logs showing gallons used for each qualifying purpose, broken out by fuel type.

Gallons purchased and gallons used for a qualifying purpose are not the same number. Buy 5,000 gallons of diesel, use 1,200 on public roads, and only the remaining 3,800 off-highway gallons are claimable. Your logs need to support that split. Vague estimates won’t hold up.

Keep records for at least three years from the date you filed the return claiming the credit. Returns filed before the due date count as filed on the due date for this purpose.¹²

Deadlines

For annual claims on Form 4136, the deadline follows the general refund clock: generally three years from the date you filed the return for the tax year the fuel was used, or two years from the date the tax was paid, whichever is later.¹⁰ The cleanest approach is to claim the credit on the return for the year the fuel was consumed.

For quarterly Form 8849 claims, the deadline is tighter. You must file during the first calendar quarter after the quarter your claim covers.¹³ Miss the window and you wait for the annual return.

Penalties on Overclaims

Overclaiming — inflating gallons, treating highway fuel as off-highway, or claiming dyed diesel that was never taxed — can bring a 20-percent accuracy-related penalty on the overstated portion. Using dyed diesel on a public highway carries its own separate penalty of $1,000 or $10 per gallon, whichever is greater.¹⁴

You can avoid the accuracy-related penalty by showing reasonable cause and good faith. The IRS weighs the effort you made to report correctly, the complexity of the issue, your experience with tax law, and whether you relied on a competent tax advisor who had all the facts.¹⁵ Detailed contemporaneous records are the single best defense if the claim is questioned.

1
Internal Revenue Service. Instructions for Form 4136 and Schedule A
2
Internal Revenue Service. About Form 637 – Application for Registration (For Certain Excise Tax Activities)
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Internal Revenue Service. Instructions for Form 4136 and Schedule A
4
Internal Revenue Service. Fuel Tax Credit
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U.S. Energy Information Administration. How Much Tax Do We Pay on a Gallon of Gasoline and on a Gallon of Diesel Fuel
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Internal Revenue Service. Form 4136 – Credit for Federal Tax Paid on Fuels
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Internal Revenue Service. Schedule 3 (Form 1040) – Additional Credits and Payments
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Internal Revenue Service. Instructions for Form 1120
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Internal Revenue Service. About Form 8849 – Claim for Refund of Excise Taxes
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Office of the Law Revision Counsel. 26 USC 6427 – Fuels Not Used for Taxable Purposes
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Internal Revenue Service. Frequently Asked Questions Form 8849 Claim for Refund of Excise Taxes
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Internal Revenue Service. Topic No. 305 – Recordkeeping
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eCFR. 26 CFR 48.6427-3 – Time for Filing Claim for Credit or Payment
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Office of the Law Revision Counsel. 26 USC 6715 – Dyed Fuel Sold for Use or Used in Taxable Use
15
Internal Revenue Service. Penalty Relief for Reasonable Cause