---
title: "HSN Code for Dimethyl methylphosphonate | HSN 29311020 GST Rate"
description: "Find HSN and GST Rates for 29311020 related to Dimethyl methylphosphonate with BUSY Accounting - The reliable source for HSN and GST details in India."
canonical: "https://busy.in/hsn/hsn-29311020/"
---

# HSN Code 29311020: Dimethyl methylphosphonate

- [Section 06: Guide to HSN Section 06](https://busy.in/hsn/section-06/)
- [Chapter 29: Organic Chemicals](https://busy.in/hsn/chapter-29/)
- [Sub-chapter 2931: Other organo-inorganic compounds](https://busy.in/hsn/sub-chapter-2931/)

## GST rates

| Description | CGST | SGST | IGST | CESS |
| --- | --- | --- | --- | --- |
| Other organo-inorganic compounds-tetramethyl lead and tetraethyl lead—tetraethyl lead | 9% | 9% | 18% | 0% |

## Frequently asked questions

### What products are classified under HSN 29311020 ?

It includes 2,4,6-Tripropyl-1,3,5,2,4,6-Trioxatriphosphinane

### How much GST applies to Dimethyl methylphosphonate?

Under HSN 29311020, Dimethyl methylphosphonate attracts Varies when sold in taxable form. Describe the exact form on the invoice.

### Any common misclassification issue with Dimethyl methylphosphonate?

Use the exact HSN and describe the form/grade. For multi‑line invoices, apply the rate per line to avoid wrong tax collection.

### Do e‑way bill and e‑invoice apply for Dimethyl methylphosphonate?

e‑Way bill is needed above ₹50,000 consignment value (subject to exemptions). e‑Invoicing is turnover‑based (presently AATO > ₹5 crore) for B2B supplies.

### How should mixed supplies be billed when Dimethyl methylphosphonate is sold with other items?

Use separate invoice lines per HSN and apply the correct rate per line (e.g., Varies for Dimethyl methylphosphonate; Nil for exempt items if applicable).

### Does packaging or labelling change the GST for Dimethyl methylphosphonate?

For food/agri items, GST can be 5% when not fresh/chilled and sold as pre‑packaged & labelled; otherwise often Nil. For non‑food items, rates depend on the specific sub‑heading.