Insights

GST for Small Businesses in India: Rates, Registration and ITC Explained (2026)

By Published 8 min read

GST replaced a tangle of indirect taxes with one system, and after the September 2025 rate overhaul it is simpler than it has ever been: two main slabs (5% and 18%), essentials at zero, and a 40% rate for luxury and sin goods. If you sell goods above ₹40 lakh a year (or services above ₹20 lakh), you must register, charge GST, and file returns — but you also get to reclaim the GST you pay on business purchases. This guide covers the parts a small business actually needs; use the GST calculator for add-GST and remove-GST math.

Who has to register

  • Goods: aggregate turnover above ₹40 lakh a year (₹20 lakh in special-category states).
  • Services: above ₹20 lakh (₹10 lakh in special-category states).
  • Regardless of turnover: anyone selling inter-state goods, selling through e-commerce operators like Amazon or Flipkart, or liable under reverse charge.

Registration below the threshold is voluntary but often smart: corporate clients prefer GST-registered vendors (they need your invoice to claim their own credit), and you can reclaim GST on your laptops, software, rent and other business inputs.

The rate slabs after the 2025 overhaul

The GST Council's September 2025 rationalisation collapsed the old 5/12/18/28 structure into a cleaner one:

SlabBroadly covers
0%Unbranded food staples, fresh produce, many essentials
5%Mass-consumption goods, most items previously at 12%
18%Standard rate — most services and manufactured goods
40%Luxury and sin goods (tobacco, pan masala, high-end cars)

For most small service businesses and freelancers, the practical answer is simple: your rate is 18%. Within a state you split it as CGST 9% + SGST 9%; across states it is a single IGST 18%. The split changes who receives the money, not what your customer pays.

Input tax credit: the heart of GST

GST is a tax on value added, and input tax credit (ITC) is the mechanism. You charge GST on sales (output tax), subtract the GST you paid on business purchases (input tax), and remit only the difference. Three conditions catch people out: you need a proper tax invoice from a registered supplier, the supplier must actually file and pay (your credit shows in GSTR-2B), and the purchase must be for business use — ITC is blocked on certain items like personal vehicles and food for employees.

Two worked examples

A small electronics trader: buys stock for ₹5,00,000 + 18% GST (₹90,000 input tax), sells it for ₹7,00,000 + 18% GST (₹1,26,000 output tax). GST payable = 1,26,000 − 90,000 = ₹36,000 — exactly 18% of the ₹2,00,000 value added. Without ITC he would have paid ₹2,16,000 in cascading tax.

A freelance designer quoting "₹1,00,000 plus GST" invoices ₹1,18,000. She paid ₹9,000 GST on software and equipment that quarter, so she remits 18,000 − 9,000 = ₹9,000. Her corporate client claims the full ₹18,000 as their own ITC — which is precisely why they insisted on a registered vendor. The GST calculator handles both the "plus GST" and "inclusive of GST" directions.

The composition scheme

Businesses with turnover up to ₹1.5 crore (services up to ₹50 lakh) can opt for the composition scheme: pay a flat 1% (traders/manufacturers) or 6% (services) of turnover, file quarterly, and skip detailed invoicing. The trade-offs: no ITC, no inter-state sales, and you cannot charge GST on invoices. It suits local B2C businesses with thin input costs — not B2B vendors whose clients want credit-eligible invoices.

Common mistakes to avoid

  • Quoting prices without saying "plus GST" — on a B2B deal that is an instant 18% margin hit.
  • Buying from unregistered suppliers — you lose the credit chain and effectively pay their hidden tax.
  • Missing return deadlines — late fees accrue per day, and your customers' ITC gets delayed, damaging relationships.
  • Ignoring GSTR-2B reconciliation — if a supplier didn't file, that credit isn't yours yet, however valid the invoice looks.

GST rewards clean paperwork: register when required (or when it wins you clients), invoice correctly, reconcile monthly, and the tax largely takes care of itself. Rates and thresholds do change with Council meetings — confirm the current rate for your specific goods or services on the official GST portal before pricing a large contract.

FAQ

Sources

The rates, thresholds and rules in this article come from the following primary sources. Figures change at Budgets and new tax years — check the source for the latest.

  1. GST portal (Government of India)
  2. CBIC — GST goods and services rates