Taxable Chemicals List Under Superfund Tax Rules

• Taxable chemicals are the substances named under IRC Section 4661.
• The list covers roughly 42 chemicals across hydrocarbons, acids, and other groups.
• Taxable substances are separate import-taxed products made using taxable chemicals.
• Rates apply per ton and get revised periodically by the IRS.
• Form 720 and Form 6627 filing is required even when the tax owed is small.

What Counts as a "Taxable Chemical"

A taxable chemical, in Superfund tax terms, is any substance that shows up by name on the list under Section 4661 of the Internal Revenue Code. If the chemical isn't on the list, the Superfund chemical tax doesn't apply to it, no matter how similar it might be to something that is.

This is by no means a new list. It was created in the original Hazardous Substance Response Revenue Act of 1980, lay dormant after the tax expired in 1995, and was revived July 1, 2022, at about double the 1980 rates with the passage of the Infrastructure Investment and Jobs Act.

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The Taxable Chemicals List: What's Actually On It

This is where you expect a nice table and get a pretty long, weirdly specific list of names. It’s easier to think in families rather than trying to memorize 42 individual chemicals. Once you know the groupings, it's much easier to see if a new product is related to something already on the list.

Begin with the hydrocarbons, as they represent a large portion of it. Here are the following hydrocarbons: acetylene, benzene, butane, butylene, butadiene, ethylene, propylene, toluene, xylene, and naphthalene. In essence, the majority of the chemicals that the chemical plant relies on come from this group.

Then there's the acid ones: hydrochloric, hydrofluoric, nitric, sulfuric, etc are named, and close by are chlorine and chloroform, which are not acids.

The remainder is a mixture of benzyl chloride, carbon tetrachloride, cresols and cresylic acid, cumene, dichlorobenzenes, ethylene dichloride, ethylene oxide, methane, phenol, phosphorus, sodium hydroxide, potassium hydroxide and styrene. There's no order in these; they're simply the chemicals named by Congress back in 1980 and forwarded by the IRS.

On an honest note, this write-up is not the complete 42-item list, and it's not meant to be used as such. The IRS's current list of rates with actual per-ton prices is included in the instructions to Form 6627, which will be more up to date than what's included here, and is what everyone should check before filing. They like to get quietly updated, as businesses can easily under-report by working off an old copy of the list.

Taxable Substances: The List's Less-Talked-About Cousin

Taxable chemicals and taxable substances are not synonymous, although the terms are used interchangeably. Products that are made with taxable chemicals are used as ingredients or taxable substances, and the tax on taxable substances is levied on the importer under Section 4671. If a taxable chemical makes up more than 20% of a substance's weight or value, that substance can end up on the taxable substances list too, which currently runs well over a hundred entries and keeps growing as the IRS reviews new petitions.

Who's Actually on the Hook

Liability depends on where a business sits in the chain:

• Manufacturers and producers of listed chemicals within the US.
• Importers bringing taxable chemicals into the country.
• Importers of taxable substances, even when the substance itself isn't a chemical on the primary list.

Companies dealing with any of these need to check their product composition against the current list not once, but periodically, since substances get added or removed as the IRS updates its determinations.

Exemptions Worth Knowing

Not every use of a listed chemical results in tax owed. A few carve-outs matter here:

• Exports are exempt, and a refund can be claimed if tax was already paid before the chemical left the country.
• Fuel use for chemicals like methane and butane is generally exempt when the chemical is used strictly as fuel.
• Transitory presence during smelting or refining doesn't trigger the tax if the chemical only appears briefly in the process.
• Coal-derived substances are excluded outright.

Documentation matters more than people expect here. The IRS hasn't issued exhaustive procedural guidance for every exemption, so businesses claiming one should keep records that would hold up if questioned later.

How the Tax Gets Calculated

Each chemical on the list carries its own per-ton rate. For a mixture or blended product, the tax is worked out by applying the relevant rate to the proportion of each taxable chemical present; a product that's part taxable chemical and part something else only owes tax on the taxable portion, calculated per ton of that component.

Importers without detailed composition data have a fallback option: self-assessing at 10% of the substance's appraised value. It's permitted, but it usually lands higher than the composition-based calculation, so it tends to be a last resort rather than a first choice.

Filing It: Form 720 and Form 6627

Superfund chemical tax gets reported through Form 6627 (Environmental Taxes), with the calculated totals carried over to Form 720 using the correct IRS reference numbers. This happens quarterly, and semi-monthly EFTPS deposits can apply on top of that if liability crosses a certain threshold, the quarterly filing and the deposit schedule run on two different clocks.

Filing electronically through an IRS-authorized provider keeps this from turning into a manual reconciliation headache every quarter, especially for businesses juggling several chemicals with different rates at once.

Final Thought

The taxable chemicals list looks intimidating mostly because it's long, not because it's complicated. Once a business knows which of its inputs or products land on that list and keeps composition records current, the actual filing becomes a simple routine quarterly task rather than a scramble.

For businesses that would rather not cross-check every shipment against the IRS list by hand, eFile720 handles Form 720 and Form 6627 filing built around exactly this kind of chemical-by-chemical reporting. Visit efile720.com to file Superfund chemical tax without the manual guesswork.

FAQs

1. How many chemicals are on the taxable chemicals list?

Roughly 42 chemicals are named under IRC Section 4661, though the exact count and rates should always be checked against the current Form 6627 instructions, since the list can be revised.

2. Is there a difference between taxable chemicals and taxable substances?

Yes. Taxable chemicals are the named substances under Section 4661. Taxable substances are products made using those chemicals, taxed separately under Section 4671, mainly at import.

3. Do exports of taxable chemicals get taxed?

No. Exports are exempt, and businesses that already paid the tax before exporting can typically claim a refund.