What is HSN Code? Complete 2026 Guide to HSN Numbers, GST Rates & How to Search

Every time you file GSTR-1, that HSN code field sits there waiting. One wrong digit and the return bounces. One blank field and a GST notice is on its way. What is HSN code, exactly, and why does getting it wrong cause so much trouble?

The HSN code, or Harmonized System of Nomenclature code, is the number that tells India's GST system exactly what you're selling. Goods use HSN codes. Services use SAC codes. Both show up in your invoices and tax returns. Whether you're searching for the computer hsn code (8471), the cashew hsn code (0801), or trying to figure out the right SAC for services like courier (9968) or maintenance (9987), this guide covers them all, with 2026 rates and updated rules.

I've helped hundreds of small business owners clean up their GST returns, and the same five or six codes come up repeatedly as sources of errors. I'll walk through all of them here.

What is HSN Code? The Actual Definition

The World Customs Organization created the HSN system in 1988. Today, more than 200 countries use it to classify goods traded across borders. India adopted it when GST launched in 2017, making it mandatory on all invoices and GST returns.

Here's the distinction most people miss: goods use HSN codes, services use SAC codes. SAC stands for Services Accounting Code. You'll see people, CA offices, and even ClearTax HSN code lookup pages use both terms interchangeably. That's fine in casual conversation, but when you're filing GSTR-1, make sure you're using the right type.

India extended the standard 6-digit international codes to 8 digits. The first 6 match the international standard. The last 2 digits are India-specific sub-classifications. You'll mostly see 4, 6, or 8 digits depending on your turnover bracket.

Why HSN Codes Are Mandatory Under GST (2026 Rules)

The GST Council didn't make HSN codes mandatory to create paperwork. The code does real work: it connects your invoice to a specific GST slab, verifies that your buyer's ITC matches what you declared, and lets the system flag mismatches automatically.

In practice, I see two main problems. First, businesses use a generic or outdated code that doesn't match the product. Second, service providers use an HSN goods code instead of a SAC service code. Both issues show up in GSTR-2B as mismatches, which can block input credit for your buyers and invite scrutiny for you.

If you've received a GST notice related to HSN misclassification or wrong code usage, the team at LegalDev.in handles these disputes and can help you draft a proper reply with supporting documentation.

One more thing: HSN codes matter for ITC claims. If you claim credit under one code but your supplier filed under a different one, GSTR-2B shows a mismatch. The GST portal will block the credit until it's resolved.

How to Read an HSN Number: The Code Structure Explained

 Reading an HSN number is straightforward once you see the layers. Think of it like a postal address going from broad to specific.

Table 1: HSN Code Digit Structure (Cashew Example)

 For most domestic transactions, you'll use 4 or 6 digits. For exports and imports, 8 digits are always required.

HSN Code List 2026: How Many Digits Does Your Business Need?

 The digit requirement has been updated progressively since 2017. Here's where it stands in 2026:

Table 2: HSN Code Digit Requirements by Turnover (FY 2026-27)

 If you recently crossed the Rs. 5 crore threshold and need to update your invoicing system, GST registration and compliance guides at gstregistration.co cover the exact steps to stay compliant.

How to Do an HSN Code Search Online in 2026

The official GST portal has an HSN search tool but it can be slow and doesn't always show up-to-date rate information. Here's how to use it properly:

1.   Go to gst.gov.in. You do not need to log in. The HSN search is available publicly under the Services menu.

2.   Click Services > User Services > Search HSN/SAC Codes. The search form appears. You can search by keyword or by code number.

3.   Type a product name or partial code. For example, type 'cashew' to get 0801 results, or type '8471' to find computer codes. The portal auto-suggests matches.

4.   Read the full description carefully. Many adjacent codes look similar. The description tells you exactly which product or sub-category is covered.

5.   Confirm the GST rate. Once you select the code, the applicable rate appears. Double-check before using it on invoices, because some headings have different rates for different sub-categories.

Ommon HSN Codes and Their 2026 GST Rates

Computer HSN Code: 8471

The computer hsn code is 8471, which covers 'automatic data processing machines.' This includes laptops, desktops, servers, and tablets. The GST rate is 18% across the board. Accessories like keyboards, mice, and monitors fall under 8471 or 8473 depending on whether they're integrated. Always check the sub-heading if you're selling components separately.

Cashew HSN Code: 0801

The cashew hsn code is 0801 under Chapter 08 (edible fruits and nuts). Raw cashew nuts in shell and shelled cashews both carry 5% GST under this heading. Roasted or otherwise processed cashews fall under Chapter 2008 (prepared or preserved fruit/nuts) and attract 12% GST. If you're a food processor or distributor, this difference matters for every invoice you raise.

7326 HSN Code: Other Articles of Iron or Steel

The 7326 hsn code covers 'other articles of iron or steel, not elsewhere specified or included.' This is a common catch-all code for miscellaneous iron and steel products: hooks, brackets, clamps, springs, fasteners, and similar hardware items that don't fit into more specific chapters. The GST rate is 18%. If your product has a more specific HSN code in Chapter 73, use that instead of 7326.

9965 HSN Code: Goods Transport Services (SAC)

SAC 9965 covers goods transport services. Road transport by a Goods Transport Agency (GTA) attracts 5% GST when the GTA does not claim input tax credit, or 12% if ITC is claimed. Rail transport services fall under 9965 at 5%. Air freight for goods not covered under exemptions is taxed at 18%. The rate you apply depends on the transport mode and whether ITC is opted in.

For transport and logistics businesses dealing with frequent GST notice issues or ITC blocking, LegalDev.in's GST legal services provide specialized support for the freight sector.

9987 HSN Code: Maintenance, Repair & Installation Services (SAC)

SAC 9987 covers maintenance, repair, and installation services. AC servicing, plumbing repairs, electrical work, CCTV installation, elevator maintenance, and similar technical services all fall here. The GST rate is 18%. If your business provides these services and you're not yet GST registered, check the GST registration process for service providers to understand when registration becomes mandatory based on your turnover.

Commission HSN Code: SAC 9961

Commission agent services are classified under SAC 9961 (services of commission agents in wholesale trade). If you earn commission on sales, referrals, or brokerage for physical goods, 9961 is the code to use. The GST rate is 18%. Real estate agents and insurance agents have their own specific sub-codes. Using the wrong SAC for commission income is a common trigger for GSTR mismatch notices.

Courier Service HSN Code: SAC 9968

The courier service hsn code is SAC 9968, which covers postal and courier services. Private courier companies must charge 18% GST on their services and file returns under this SAC. Services by India Post (speed post, registered post, ordinary mail) are exempt from GST. If you run a courier or last-mile delivery business, 9968 is your filing code. Getting this wrong means mismatched ITC for your business clients who rely on your invoices for credit.

Table 3: HSN and SAC Code Quick Reference 2026

5 HSN Code Errors That Lead to GST Notices

•     Using HSN codes for services: Services need SAC codes. Writing a goods HSN code on a service invoice creates mismatches in GSTR-2B for your client and flags your return for review.

•     Sticking to 4-digit codes after crossing Rs. 5 crore: Once turnover crosses the threshold, GSTR-1 validates for 6 digits. Four-digit codes get rejected.

•     Copying from old invoices: An HSN code from a 2020 invoice may have been revised. Always verify against the current GST HSN master list before filing.

•     Mixing up adjacent product codes: Cashew in shell (0801) and processed cashew (2008) sit in different chapters with different tax rates. The same product at different stages of processing can carry different codes.

•     Assuming all 18% items have the same HSN: Multiple HSN codes carry 18% GST but refer to completely different products. The code and description must match what's actually on the invoice.

Conclusion

HSN codes aren't just a compliance formality. They connect your invoices to the right tax slab, keep your buyer's ITC intact, and protect you from the notice cycle that follows a misclassification. The most common problem isn't that people don't know about HSN codes. It's that they know just enough to get it half-right.

The service SAC codes trip people up the most: 9965 for goods transport, 9987 for maintenance and repair, 9968 for courier services, and 9961 for commission agents. Goods codes like 8471 (computers) and 0801 (cashew) are more stable, but rates can still shift with GST Council notifications, so verify before every filing season.

For GST registration, return filing, or fixing HSN classification issues before they become notices, visit gstregistration.co. For legal help with existing notices or disputes, the specialists at LegalDev.in handle GST classification and notice reply matters specifically.

Got a specific code question not covered here? Drop it in the comments and I'll add it to the guide.

Frequently Asked Questions