How to Fill Out Form 8849 Schedule 6: CRN, Statement, and Deadline

To fill out Form 8849 Schedule 6, you identify the Claim Reference Number (CRN) that matches the excise tax you overpaid, write a statement explaining the claim and how you calculated it, attach that statement and Schedule 6 to a signed Form 8849, and either mail the package to the IRS in Cincinnati or e-file it through an approved provider. Schedule 6 is the catch-all schedule for excise tax refunds that don’t fit on Schedules 1, 2, 3, 5, or 8, covering claims tied to Form 720, Form 2290, Form 730, and Form 11-C.¹

Make Sure Schedule 6 Is the Right Form

Schedule 6 is for taxes that were correctly reported at the time but that circumstances now entitle you to get back: an article you paid excise tax on was later exported, sold as supplies for a vessel or aircraft, sold to a state or local government for its exclusive use, or sold to a nonprofit educational organization for its exclusive use. Those situations are treated as overpayments under Section 6416(b)(2).²

If instead the original Form 720 itself was wrong (you put the wrong number on a line), you don’t want Schedule 6 at all. You want Form 720-X, the amended quarterly return.³ Short version: return was correct, facts changed after — Schedule 6. Return was wrong — 720-X.

Gather Before You Start

You’ll move faster if the following are in front of you before you open the form:

Your EIN or taxpayer identification number. It goes on every page of the schedule, including any additional sheets you attach.⁴
A copy of the original Form 720, 2290, 730, or 11-C on which the tax was reported and paid.
Supporting invoices and receipts showing the excise tax amount actually paid, plus any shipping or sales documents that prove the facts behind the refund.
The correct CRN for your tax type, taken from the Schedule 6 instructions.
The calendar quarter or quarters your claim covers. You can combine multiple quarters on one Schedule 6, but you must list the amounts separately by quarter, and you enter the earliest and latest claim-period dates on page 1.⁵

Pick the Right CRN

Each type of refund claim has its own Claim Reference Number, and entering it correctly is how the IRS routes your paperwork. The June 2026 instructions list more than two dozen. A few of the most common:⁵

CRN 383 for the 12 percent retail excise tax on trucks, trailers, semitrailer chassis and bodies, and tractors under Section 4051⁶
CRNs 396, 304, and 305 for taxable tires (standard, biasply or super single, and super single designed for steering)
CRN 340 for gas guzzler automobiles
CRN 310 for diesel-water fuel emulsion blending
CRN 397 for vaccines and CRN 398 for ozone-depleting chemicals
CRN 365 for heavy highway vehicle use tax (Form 2290)
CRN 368 for wagering taxes (Form 730)
CRN 441 for repurchase of corporate stock

Coal producers who overpay the Section 4121 tax also use Schedule 6. The rate is $1.10 per ton for underground mines and $0.55 per ton for surface mines, capped at 4.4 percent of the sale price; lignite is exempt.⁷

Write the Statement That Goes With the Schedule

Schedule 6 isn’t a fill-in-the-boxes form. The heart of every claim is an attached written statement, and the required contents depend on which tax you’re claiming a refund on.⁸ Get this piece wrong and the claim stalls.

Form 720 Claims

Your statement must include a detailed description of the claim (the specific facts, not just “overpayment”), the amount broken out by quarter if it spans more than one, the calculation you used to arrive at the amount, and any additional information the applicable regulations call for. For tire claims under CRNs 396, 304, and 305, include the number of taxable tires for each CRN.

Section 6416 Certification for Manufacturer or Retail Excise Taxes

If your Form 720 claim involves a manufacturers or retail excise tax under Chapter 31 or 32, you have to show that the economic burden of the tax isn’t being pushed onto someone else. One of the following must be true, and your statement must establish which:²

You never included the tax in the article’s price and never collected it from the buyer.
You repaid the tax amount to the ultimate purchaser.
For Section 6416(b)(2) claims, you repaid or agreed to repay the tax to the ultimate vendor, or you obtained that vendor’s written consent to the refund.

Failing to establish one of these is one of the most common reasons Schedule 6 claims get kicked back. If the IRS can’t see from your paperwork that the tax wasn’t passed along to the end buyer, it won’t process the refund.

Form 2290 Claims (Heavy Highway Vehicle Use Tax)

Under CRN 365, if you’re claiming a refund because a taxable vehicle was sold, destroyed, or stolen during the tax period, include the VIN, the taxable gross weight category, whether the vehicle was sold, destroyed, or stolen, the date of that event, and a computation showing the refund amount. If the vehicle was sold on or after July 1, 2015, add the name and address of the buyer.⁸

Form 730 Claims (Wagering Tax)

Under CRN 368, your statement must explain the reason for the refund, give the date and amount of the original tax payment, and say whether you’ve filed any previous claim for the same amount. You also have to certify one of the following: you never collected the tax from the person who placed the wager, you repaid the tax to that person, or you have that person’s written consent to the refund. If it’s the third option, attach the consent.⁸

Diesel-Water Fuel Emulsion Blending (CRN 310)

This one has a $750 minimum, which you can hit by combining amounts from any quarters within your income tax year for which you haven’t already filed a claim. Your statement has to certify that you produced a diesel-water emulsion containing at least 14 percent water, that the emulsion additive was EPA-registered under Section 211 of the Clean Air Act, and that you used undyed diesel fuel taxed at $0.244 per gallon to produce it.⁸

Attach, Sign, and File

Attach Schedule 6 and every supporting statement to Form 8849. Sign Form 8849. An unsigned paper submission won’t be processed.

If mailing, send it to:

Department of the Treasury
Internal Revenue Service
Cincinnati, OH 45999-0002⁹

Use certified mail or a tracked delivery service so you can prove the IRS received it. That address is only for Schedules 1 and 6; the other schedules go to a different location in Covington, Kentucky.

To e-file, use an IRS-approved Modernized e-File provider under the Excise Tax e-File and Compliance (ETEC) program.¹⁰ The IRS website doesn’t offer direct e-filing of Form 8849; you have to go through a third-party provider. E-filed claims generally move faster because the IRS doesn’t have to key in the data by hand.

Check the Deadline Before You Do Anything Else

You must file your Schedule 6 claim within three years from the date you filed the return that reported the tax, or within two years from the date you actually paid the tax, whichever is later. If you never filed a return for the tax in question, you have two years from the payment date.¹¹ Miss the window and the IRS will reject the claim on that ground alone, no matter how solid the underlying facts are. If your potential refund sits several quarters back, run these dates first.

After You File

The IRS processes Schedule 6 claims within 45 days of acceptance.¹² Complex claims or unusually large amounts can take longer if the IRS asks for more documentation. Approved refunds go out by check or direct deposit.

If the claim is denied, you’ll get a letter explaining why. The recurring reasons are incomplete written statements, missing supporting documents, and failure to establish the Section 6416 conditions on manufacturer or retail excise tax claims. Keep a full copy of what you submitted — the Schedule 6, Form 8849, all attachments, and your proof of mailing — so you can respond fast if the IRS follows up or you decide to appeal.

Penalties for Excessive Claims

Overclaiming has teeth. For fuel-related claims under Sections 6416(a)(4), 6420, 6421, 6427, or 6435, the penalty for an excessive amount is the greater of two times the excess or $10, on top of any criminal exposure if the overclaim was intentional.¹³ The only defense is reasonable cause. Recheck your math and your supporting paper before you submit; an explainable calculation error is far better than a sloppy one you can’t account for.

1
Internal Revenue Service. About Form 8849, Claim for Refund of Excise Taxes
2
Office of the Law Revision Counsel. 26 USC 6416 – Certain Taxes on Sales and Services
3
Internal Revenue Service. About Form 720-X, Amended Quarterly Federal Excise Tax Return
4
Internal Revenue Service. Instructions for Schedule 6 (Form 8849) – Other Claims
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Internal Revenue Service. Instructions for Schedule 6 (Form 8849) (Rev. June 2026)
6
Office of the Law Revision Counsel. 26 USC 4051 – Imposition of Tax on Heavy Trucks and Trailers Sold at Retail
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Office of the Law Revision Counsel. 26 USC 4121 – Imposition of Tax
8
Internal Revenue Service. Instructions for Schedule 6 (Form 8849) (10/2025)
9
Internal Revenue Service. Form 8849 – Claim for Refund of Excise Taxes
10
Internal Revenue Service. Excise Tax e-File and Compliance (ETEC) Programs – Forms 720, 2290, and 8849
11
Office of the Law Revision Counsel. 26 USC 6511 – Limitations on Credit or Refund
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Internal Revenue Service. Frequently Asked Questions – Form 8849, Claim for Refund of Excise Taxes
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Office of the Law Revision Counsel. 26 USC 6675 – Excessive Claims With Respect to the Use of Certain Fuels