GST — Goods and Services Tax — has been in force in India since July 2017, yet many small business owners and freelancers still find it confusing. This complete guide explains GST registration, returns, slabs, input tax credit, and everything a small business owner needs to know in plain simple language.
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GST is a unified indirect tax that replaced multiple taxes — VAT, service tax, excise duty, and others — with a single tax system. It follows a destination-based taxation model, meaning tax is collected at the point of consumption, not at the point of production.
GST has three components: CGST (Central GST) collected by the central government, SGST (State GST) collected by the state government for intra-state sales, and IGST (Integrated GST) for inter-state sales, collected by the central government and shared with the destination state.
GST registration is mandatory if your annual aggregate turnover exceeds these thresholds:
| Business Type | Registration Threshold |
|---|---|
| Goods (supply of products) | ₹40 lakhs per year |
| Services (freelancers, consultants) | ₹20 lakhs per year |
| Special category states (NE states, Himachal, etc.) | ₹10 lakhs per year |
| E-commerce sellers (any turnover) | Mandatory regardless of turnover |
| Inter-state supply of goods | Mandatory regardless of turnover |
Even if below the threshold, voluntary GST registration is beneficial if your clients are businesses — they can claim input tax credit on your invoices, making you a preferred vendor.
| GST Rate | Examples of Goods/Services |
|---|---|
| 0% (Nil) | Fresh vegetables, milk, eggs, educational services, health services |
| 5% | Packaged food, transport services, economy hotel rooms |
| 12% | Processed food, business class air travel, construction services |
| 18% | Most services (IT, consulting, freelance), electronics, restaurants (AC) |
| 28% | Luxury goods, automobiles, tobacco, 5-star hotels |
Most service providers — IT professionals, designers, consultants, digital marketing agencies — fall under the 18% GST slab.
One of the biggest advantages of GST registration is Input Tax Credit (ITC). When you purchase goods or services for your business and pay GST on those purchases, you can claim that GST back against the GST you collect from your customers. You only pay the net difference to the government.
For example: You collect ₹18,000 GST from clients. You paid ₹5,000 GST on business purchases (laptop, software, office rent). You pay only ₹13,000 to the government, not ₹18,000. The ₹5,000 is your Input Tax Credit.
| Return | Who Files | Frequency | Due Date |
|---|---|---|---|
| GSTR-1 | All registered taxpayers | Monthly / Quarterly | 11th of next month |
| GSTR-3B | All registered taxpayers | Monthly | 20th of next month |
| GSTR-4 | Composition scheme taxpayers | Annual | 30th April |
| GSTR-9 | Annual return (turnover above ₹2 crore) | Annual | 31st December |
If your annual turnover is below ₹1.5 crore (₹75 lakh for some states), you can opt for the Composition Scheme. Under this scheme, you pay a fixed low rate of GST (1% for traders, 5% for restaurants, 6% for service providers) and file only one quarterly return instead of monthly returns. However, you cannot collect GST from customers or claim ITC.