Identify the product or service accurately
Check the product description, material, use, and form
Refer to the GST tariff or customs tariff schedule
Search the HSN classification chapter relevant to the product
Match the product with the chapter notes and section notes
Compare the product with headings and subheadings
Use the General Rules for Interpretation of the tariff
Verify the code with GST portal, CBIC, or customs resources
Consult a tax professional if classification is unclear
Confirm the final HSN code based on the exact product specifications