Blog · 15 October 2026

Federal Diesel Excise Tax and EO 14435: Dyed vs Clear Diesel, §7508A Deferral and What US CPA Firms Should Tell Clients

By Keshav Bansal, CA

Executive Order 14435 (“Emergency Tax Relief on Diesel Fuel”), signed October 5, 2026 and published in the Federal Register on October 9 (91 FR 64747), directs Treasury to defer certain federal diesel excise tax payments under IRC §§4041(a)(1)(A) and 4041(b)(1)(B) for liabilities incurred October 5 through December 31, 2026—if §7508A relief is authorized—and to waive §6715 dyed-diesel-on-highway penalties for that window. It does not repeal the tax, does not set a deferred due date by itself, and does not cut the pump price on most clear diesel already taxed at the terminal rack under §4081. US CPA firms with farm, construction, trucking, and fuel-distributor clients need the Code architecture before advising.

What EO 14435 actually orders

Section 2(a) gives the Treasury Secretary five days to determine whether relief is authorized under 26 U.S.C. §7508A, including whether a qualifying event has occurred and which taxpayers are affected. If those determinations are made, the Secretary shall, to the extent authorized by law, defer payment of the taxes imposed by §§4041(a)(1)(A) or 4041(b)(1)(B) incurred during October 5–December 31, 2026. Section 2(b) says deferred amounts are deferred without penalties, interest, or additions to tax—to the extent the law allows. Section 2(c) directs the IRS to announce that it will not impose a penalty under §6715(a)(1) or (a)(2) when dyed diesel is sold for use or used on the highway during that same window, and to address semimonthly-deposit penalty relief.

Section 3 requires implementing guidance identifying the relief and conditions, legal basis, covered taxpayers and activities, applicable periods, and the date postponed taxes must be paid. Section 4 tells the Secretary to explore avenues, including legislation, to eliminate the obligation to pay the deferred amounts. As of mid-October 2026, that implementing guidance on the deferred due date had not been posted. Treat the order as a conditional deferral roadmap, not a self-executing holiday. For how §7508A postponements usually work in disaster settings, see our IRS disaster relief / §7508A guide.

Federal diesel excise tax: §4081 rack vs §4041 retail

Most highway diesel is taxed when it leaves a terminal or refinery under IRC §4081. Section 4081(a)(2)(A)(iii) sets the diesel (and kerosene) rate at 24.3 cents per gallon, plus the 0.1-cent Leaking Underground Storage Tank Trust Fund financing rate under §4081(a)(2)(B)—24.4¢ per gallon in total. Section 4041(a)(1)(A) imposes a parallel retail tax on diesel sold for use (or used) in a diesel-powered highway vehicle or train when there was no prior taxable sale. Section 4041(a)(1)(B) turns that retail tax off when tax was already imposed under §4081 and not credited or refunded. That is why EO 14435’s deferral of §4041 liabilities will not, by itself, lower the posted price at most truck stops: the fuel was already taxed at the rack.

Section 4041(b)(1)(A) exempts off-highway business use; §4041(b)(1)(B) taxes that liquid if later used otherwise. The EO’s §4041(b)(1)(B) cross-reference targets that “other use”—especially dyed diesel sold tax-free for farm or construction that ends up in a highway tank. Excise deposit timing differs from income-tax collection; compare the remittance-excise pattern in our Notice 2026-52 remittance excise tax article.

Dyed vs clear diesel and §6715

Clear (undyed) diesel is the highway product that carries the federal road tax. Dyed (red) diesel is marked under §4082 for nontaxable uses—farming, off-highway business use, heating, and similar exempt purposes—and is ordinarily sold without the highway excise. Using or selling dyed diesel for a taxable highway use normally triggers both the underlying tax and the civil penalty in IRC §6715. Under §6715(a)(1) and (a)(2), the penalty is the greater of $1,000 or $10 per gallon (escalating for prior penalties). EO 14435 Sec. 2(c) points the IRS to announce that it will not impose those (a)(1)/(a)(2) penalties for highway sale or use of dyed diesel during October 5–December 31, 2026. A penalty waiver is not a tax repeal: Sec. 3’s guidance must still say when any deferred tax is due.

Postponement is not forgiveness

§7508A lets the Secretary disregard up to one year in timing certain acts and computing interest, penalties, and additions for taxpayers affected by a federally declared disaster, significant fire, or terroristic or military action. An EO can direct Treasury to evaluate and use that authority; it cannot rewrite the Code. Deferred §4041 amounts remain owed unless Congress eliminates them—the path Sec. 4 expressly asks Treasury to explore. Firms should not book the deferral as extinguished income. If cash-flow pressure follows when the deferred due date arrives, walk clients through installment agreements and other options in our IRS collection alternatives guide. State motor-fuel holidays (a temporary pause of state cents-per-gallon) are separate from this federal EO and do not erase the federal excise.

CPA checklist for diesel clients through year-end 2026

1. Map which tax applies. Identify whether gallons are §4081 rack-taxed clear diesel, §4041 retail/other-use liabilities, or dyed product sold for nontaxable use—EO 14435’s deferral text reaches §§4041(a)(1)(A) and 4041(b)(1)(B), not a blanket §4081 rebate.
2. Watch for implementing guidance. Calendar Treasury/IRS releases that name covered taxpayers, conditions, periods, and the date postponed taxes must be paid (EO Sec. 3). Do not invent a due date.
3. Separate penalty relief from tax liability. Document any §6715(a)(1)/(a)(2) announcement for the Oct 5–Dec 31 window; keep dyed-gallon logs so the firm can reconcile tax when guidance posts.
4. Preserve deposit and Form 720 trails. Note any semimonthly-deposit penalty relief under Sec. 2(c); continue accurate quantity tracking even if deposit timing shifts.
5. Do not promise a pump-price cut. Explain §4041(a)(1)(B)’s prior-tax exemption and the §4081 24.4¢ rack total so clients understand why rack-taxed clear diesel may look unchanged at the pump.
6. Plan for payment, not erasure. Model cash needs for the deferred §4041 balance; treat Sec. 4’s legislative exploration as contingent, not enacted forgiveness.

Where Tax Brew fits

Diesel excise files mix terminal invoices, dyed-fuel logs, and Form 720 deposits that reviewers must reconcile when guidance sets a due date. Tax Brew supports US CPA firms with tax prep support, bookkeeping and cleanup so partners can spend more time on the §4041/§4081 mapping. See our services, or email info@taxbrewglobal.com.

Sources: Executive Order 14435, “Emergency Tax Relief on Diesel Fuel” (Oct. 5, 2026; 91 FR 64747, Oct. 9, 2026; FR Doc. 2026-20855); IRC §§4041(a)(1)(A)–(B), 4041(b)(1)(A)–(B), 4081(a)(2)(A)(iii)–(B), 6715(a)–(b), 7508A (Cornell LII / uscode.house.gov). As of mid-October 2026, Treasury/IRS implementing guidance under EO Sec. 3 specifying the deferred payment date had not been posted. General information, not tax advice. Confirm current IRS announcements before changing dyed-diesel sales or deposit practices.