How to Find the Right GST Rate for Your Product or Service
Written by Naresh, Founder of QWIK INVOICE · Last updated: 29 August 2026
The GST rate that applies to what you sell is tied to its HSN or SAC classification — not a general category guess. GST rates sit in five slabs (NIL, 5%, 12%, 18%, 28%), and the only reliable way to know which one applies is to look up the actual classification code on the official GST portal, not assume based on what similar-sounding products are taxed at.
How is this different from the HSN/SAC codes guide?
Our HSN & SAC codes guide explains what these codes are and how many digits your invoice needs based on your turnover — the "why does this number matter" side. This guide is the practical companion: "how do I actually find the right number and rate for what I sell." Read both together if you're setting up invoicing for the first time.
What are the GST rate slabs?
Goods and services fall into one of five rate slabs: NIL (0%), 5%, 12%, 18%, and 28%. Which slab a specific item falls into is determined entirely by its HSN (for goods) or SAC (for services) classification — the same broad "type" of product can land in different slabs depending on its precise material, use, or specification. There's no shortcut around checking the actual code.
How do I actually look up the rate?
The authoritative source is the official GST portal's HSN/SAC search tool. The practical process:
- Search by a clear description of your product or service, or by a code if you already have a candidate.
- Read the full returned description carefully — not just the summary line — and compare it against your product's actual material, purpose and specification.
- Note the applicable rate shown for that specific classification.
- If more than one classification seems plausible, lean toward the more specific/precise match rather than a broader catch-all category, and confirm with a tax professional if it's genuinely ambiguous or high-value.
Third-party rate-lookup tools can be a fast starting point, but treat the GST portal as the source you confirm against before finalizing pricing or an invoice — third-party databases can lag behind notification changes.
Why do near-identical products sometimes have different rates?
Because classification is genuinely granular. Two products that look the same to a buyer — say, two garments made from different fabric compositions, or two services that sound similar but differ in scope — can carry different HSN/SAC codes and therefore different rates. This is exactly why classification disputes happen in practice: it's rarely that someone picked an obviously wrong category, it's that two plausible categories exist and the wrong one was picked. Reading the full classification description, not just matching on the product name, is what avoids this.
Worked example: why the description matters more than the label
| Step | What to check |
|---|---|
| 1. Search | Enter your product/service name or a candidate code into the GST portal's HSN/SAC finder |
| 2. Compare | Read the full classification description — material, composition, use-case — against your actual item, not just the summary |
| 3. Confirm the rate | Note the slab (NIL/5%/12%/18%/28%) shown for that exact classification |
| 4. Apply consistently | Use the same code and rate every time you invoice that same item, so your records stay internally consistent |
What's the real cost of getting the rate wrong?
Undercharging GST doesn't make the liability disappear — it means you owe the shortfall later, typically with interest, once the error surfaces (in an audit, a customer's ITC claim query, or your own reconciliation). Overcharging isn't a compliance violation the same way, but it makes your pricing less competitive and can create a messy refund/credit-note situation once corrected. And using an outright wrong classification code — not just the wrong rate within a plausible code — can flag the invoice as non-compliant regardless of which direction the rate error went.
Common mistakes to avoid
- Guessing a rate based on what a "similar" product is taxed at, instead of looking up the actual classification.
- Reading only the summary line of a search result instead of the full classification description.
- Using a different code for the same product across different invoices, which creates internal inconsistency even before external audit risk.
- Relying solely on a third-party rate database without spot-checking against the official GST portal for anything high-value or ambiguous.
Once you know the right HSN/SAC code and rate, QWIK INVOICE's invoice generator has a dedicated field for it on every line item, and calculates the tax automatically once you enter the rate — see our CGST vs SGST vs IGST guide for how the split itself is calculated once the rate is known.
Frequently asked questions
What are the GST rate slabs?
GST rates sit in five slabs: NIL, 5%, 12%, 18% and 28%. Which slab applies to a specific product or service is determined by its HSN or SAC classification, not by a general category guess — two items that seem similar can carry different rates if their precise classification differs.
Where do I actually look up the GST rate for something I sell?
The official GST portal has an HSN/SAC search tool where you can search by product or service description, or by a known code, and see the applicable rate directly. This is the authoritative source — third-party rate-lookup tools can be a useful starting point, but the GST portal itself is what to confirm against before finalizing an invoice.
What happens if I charge the wrong GST rate on an invoice?
Undercharging creates a liability for you as the seller — you'll owe the difference later, generally with interest, once the error is caught. Overcharging isn't a compliance violation in the same way, but it makes your pricing less competitive and can create a refund headache for the customer. A wrong classification entirely can also flag an invoice as non-compliant in an audit.
Why do two similar-looking products sometimes have different GST rates?
Because GST classification is based on specific material, purpose, and technical specification, not a general product category. Two items that look alike to a buyer — say, two types of the same fabric with different compositions — can fall under different HSN codes with different rates. This is exactly why comparing the full classification description carefully matters more than pattern-matching on the product name.
What is the latest GST rate list, after the 2025 rate revision?
GST rates were significantly revised effective 22nd September 2025 as part of a rate rationalization, moving many goods and services between slabs. Because of this, older rate lists, blog posts and even some third-party tools can show pre-revision rates. Always confirm the current rate against the live GST portal HSN/SAC search rather than trusting a static list you find elsewhere, however recent it looks.
Which items fall under the 5% GST slab?
The 5% slab generally covers essential and mass-consumption goods and services — common examples include items like packaged food staples, footwear/apparel below certain price points, and some transport services — but the exact list is long, classification-specific, and has shifted with recent rate revisions. Rather than relying on a general list, search your specific product or service on the GST portal's HSN/SAC finder to confirm its current slab.
How do I calculate the GST rate from the GST amount charged?
Divide the GST amount by the taxable value (the pre-tax price) and multiply by 100: GST rate % = (GST amount ÷ taxable value) × 100. For example, if the taxable value is ₹1,000 and the GST charged is ₹180, that's (180 ÷ 1000) × 100 = 18%. This is useful for checking a rate on an invoice you've received, as opposed to looking one up before you issue your own.
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