# 2025-08503: IRS Considers Adding Tongue-Twisting Chemical to Superfund Tax List

2025-08503, Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Di-IsoNonyl Phthalate, is a Federal Register notice from Treasury Department, Internal Revenue Service published 2025-05-14 (as of 2026-10-20).

- Canonical: https://policyrisk.com/federal-register/2025-08503
- As of: 2026-10-20
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-08503
- Title: Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Di-IsoNonyl Phthalate
- Type: Notice
- Agencies: Treasury Department; Internal Revenue Service
- Citation: 90 FR 20551
- Published: 2025-05-14
- Effective: unknown
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-10-20

## In one line

IRS Considers Adding Tongue-Twisting Chemical to Superfund Tax List

## Summary

The IRS got a request to add a chemical called di-isononyl phthalate to the list of substances that get a Superfund tax. This means companies dealing with this chemical might pay extra taxes if the change happens. People have until July 14, 2025, to share their thoughts or ask for a public hearing before any decision is made.

## Abstract

This notice of filing announces that a petition has been filed requesting that di-isononyl phthalate be added to the list of taxable substances. This notice of filing also requests comments on the petition. This notice of filing is not a determination that the list of taxable substances is modified.

## Effects PRIA read

- Petition to Tax a Specific Chemical: cost, medium. A petition has been filed asking that di-isononyl phthalate be added to the list of substances subject to the Superfund tax. If that change is approved, companies that make, import, or sell this chemical might have to pay a new tax to help fund pollution cleanup. This notice says the petition was f…
- Opportunity to Submit Public Comments: benefit, low. The Treasury and IRS are asking for public comments on the petition to add di-isononyl phthalate to the Superfund taxable substances list. If you are a company, industry group, or other stakeholder affected by this chemical, you can submit comments now to explain how the change would affect you bef…

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## Sources
- [2025-08503 on federalregister.gov](https://www.federalregister.gov/documents/2025/05/14/2025-08503/superfund-tax-on-chemical-substances-request-to-modify-list-of-taxable-substances-notice-of-filing)
- [2025-08503 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-05-14/pdf/2025-08503.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2025-08503 (as of 2026-10-20).