GST Calculator
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GST Calculator (Multi-Slab)の包括的な教育ガイドを準備中です。ステップバイステップの解説、数式、実例、専門家のヒントをお届けしますので、もうしばらくお待ちください。
Goods and Services Tax (GST) is India's comprehensive indirect tax system that replaced multiple state and central taxes (VAT, service tax, excise duty, octroi, entry tax, etc.) from July 1, 2017. It is a dual GST system — both the Central Government (CGST) and State Governments (SGST) levy GST simultaneously on intra-state transactions; for inter-state transactions, Integrated GST (IGST) is levied by the Centre and shared with states. GST is a consumption-based tax with a multi-tier rate structure: 0% (essential food items, healthcare, education), 5% (basic necessities, household items, essential services), 12% (processed foods, computers, business services), 18% (most goods and services, restaurants, financial services), and 28% (luxury goods, sin goods). Additionally, a GST Compensation Cess applies on certain items like tobacco, coal, and luxury cars above the 28% rate. A key feature of GST is the Input Tax Credit (ITC) mechanism — businesses registered for GST can claim credit for GST paid on inputs (raw materials, services), reducing cascading tax effects. GST is levied at every stage of the supply chain — from manufacturer to wholesaler to retailer — but the tax burden effectively falls on the final consumer because businesses claim ITC. For consumers, the GST-inclusive price is what they pay; for businesses, understanding the GST implications on their sales and purchases is essential for pricing, compliance, and cash flow management.
GST Amount = Supply Value × GST Rate / 100; For intra-state: CGST = GST/2, SGST = GST/2; For inter-state: IGST = Full GST Amount; Effective Cost to Consumer = Base Price + GST; GST-exclusive price from GST-inclusive price = Inclusive Price / (1 + GST Rate/100)
- 1Determine the HSN (Harmonised System of Nomenclature) code for goods or SAC (Services Accounting Code) for services — these codes determine the applicable GST rate assigned by the GST Council.
- 2Identify the nature of the transaction: intra-state (supplier and customer in same state) → CGST + SGST each at half the total rate; inter-state (different states) → IGST at the full rate.
- 3Calculate GST on the transaction value: if the base price is ₹1,000 and GST rate is 18%, the tax is ₹180 (₹90 CGST + ₹90 SGST for intra-state, or ₹180 IGST for inter-state).
- 4If the supplier is a GST-registered business, they issue a tax invoice with GST details; if the buyer is also GST-registered, they can claim Input Tax Credit (ITC) on the GST paid, reducing their net GST liability.
- 5GST returns must be filed monthly or quarterly: GSTR-1 (outward supplies), GSTR-2B (auto-populated ITC), and GSTR-3B (summary return and payment); annual return GSTR-9 by December 31 each year.
- 6Composition scheme is available for small businesses with turnover below ₹1.5 crore (₹75 lakh for some states) — they pay a lower flat GST rate (1-6%) but cannot claim ITC and cannot collect GST from customers.
- 7Consumers (non-registered individuals) pay the full GST-inclusive price on purchases — they cannot claim ITC; the GST calculator helps them understand the tax component of their purchases.
Restaurants (non-5-star hotels) charge 5% GST; cannot claim ITC on inputs
Restaurants (except those in 5-star hotels) are taxed at 5% GST but cannot claim Input Tax Credit. The 5% applies on the food and beverages value; service charge (if any) is at the discretion of the restaurant and is not GST.
Smartphones, laptops, and most electronic goods attract 18% GST
Most electronic goods including smartphones fall under the 18% GST slab. The consumer pays ₹29,500 total; the retailer collects ₹4,500 as GST and can set off ITC from their purchases against this liability.
Luxury and large SUVs attract 28% GST + 22% cess = 50% total tax on base price
Vehicles >1500cc (SUVs, luxury sedans) attract 28% GST + compensation cess of 17-22% depending on engine capacity. The total tax burden of 50% makes large vehicles extremely expensive — the government uses GST as a tool to discourage luxury consumption.
ITC mechanism prevents cascading taxes — only value addition at each stage is taxed
The distributor collects ₹18,000 GST from the buyer and claims ₹10,000 ITC (GST paid on raw materials/inputs). Net GST remitted to government = ₹8,000. The final consumer pays 18% on the full price; but the tax is collected in stages, each entity paying tax only on the value added.
Business pricing — computing the GST-inclusive selling price from the base price to correctly quote customers and maintain margins.
Consumer awareness — understanding the GST component in bills for restaurants, retail purchases, services, and electronics.
Tax reconciliation — businesses computing net GST liability after ITC adjustments for monthly/quarterly GST return filing.
Supply chain management — evaluating the GST impact of sourcing from different states (intra vs inter-state affects cash flow due to CGST/SGST vs IGST treatment).
E-commerce sellers — calculating GST on different product categories and filing accurate GSTR-1 for all sales through platforms.
GST on Real Estate
Under-construction properties attract 5% GST on the sale value (1% for affordable housing — below ₹45 lakh cost and area limits). Completed ready-to-occupy properties where the Completion Certificate has been received do not attract GST — stamp duty and registration apply instead. Developers can claim ITC on construction materials and services, but the rate structure limits full ITC recovery.
GST on E-Commerce
E-commerce operators (Amazon, Flipkart, etc.) must collect Tax Collected at Source (TCS) at 1% of the net taxable supplies made through their platform and deposit it with the government. The seller can claim this TCS as credit against their GST liability. E-commerce sellers must register under GST regardless of their turnover — the ₹40 lakh threshold exemption does not apply to e-commerce sellers.
GST on Financial Services
Banking, insurance, and financial services are generally taxed at 18% GST. However, basic banking services provided to Jan Dhan accounts (zero balance accounts) are exempt. Insurance premiums: term life insurance attracts 18% GST; health insurance 18%; motor insurance 18%; life insurance premiums (endowment) are treated differently. Interest income on loans is exempt from GST (treated as exempt supply).
Petroleum Products Outside GST
Crude oil, petrol, diesel, aviation turbine fuel (ATF), and natural gas are excluded from GST by constitutional mandate (Article 279A). These continue to be taxed under the central excise duty and state VAT system. The high tax on petroleum products (total effective tax often 50-70%) is not visible in the standard GST framework. Bringing petroleum under GST has been deferred by the GST Council due to revenue concerns for states.
| GST Rate | Category | Examples |
|---|---|---|
| 0% | Essentials, exempt | Fresh food, milk, eggs, healthcare, school education, public transport |
| 5% | Basic necessities | Sugar, spices, tea, coffee, textiles, medicines, economy hotels (<₹1,000/night), railways AC |
| 12% | Processed goods, mid-tier services | Processed/packed food, computers, hotels ₹1,000-₹7,500/night, business class air travel |
| 18% | Standard goods and services | Smartphones, electronics, FMCG, financial services, 5-star restaurants, hotels >₹7,500/night |
| 28% | Luxury and demerit goods | Large cars (>1500cc), SUVs, tobacco, cement, air conditioners, luxury cosmetics |
| 28%+Cess | Sin goods and ultra-luxury | Cigarettes, pan masala, luxury cars (additional 1-22% cess over 28%) |
What are the GST slab rates and what falls under each?
GST has five main rates: 0% — essential unprocessed food (rice, wheat, vegetables, milk), healthcare services, education; 5% — essential food items (sugar, spices, tea, coffee), household necessities, textile, medicines, essential services; 12% — processed foods, computers, business services, hotels (₹1,000-₹7,500/day); 18% — most goods (electronics, FMCG), financial services, restaurants (5-star), hotels above ₹7,500/day; 28% — luxury goods (cars >1500cc, tobacco, cement, air conditioners, perfumes, luxury cosmetics). GST Council reviews and revises the rate structure periodically.
What is the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) are levied simultaneously on intra-state supplies — each at half the combined GST rate. For example, an 18% GST transaction in Maharashtra: 9% CGST (goes to Centre) + 9% SGST (goes to Maharashtra). IGST (Integrated GST) is levied on inter-state supplies and imports at the full combined rate — collected by the Centre and then distributed to the destination state. IGST ensures uniform taxation across state boundaries.
Who needs to register for GST?
GST registration is mandatory for: businesses with aggregate annual turnover exceeding ₹40 lakh (₹20 lakh for service providers; ₹10 lakh for specified special category states like Manipur, Nagaland, etc.); inter-state suppliers regardless of turnover; e-commerce operators; non-resident taxable persons; businesses liable to pay GST on reverse charge mechanism; and businesses transferring goodwill/business. Voluntary registration is also permitted for smaller businesses to claim ITC.
What is the Input Tax Credit (ITC) mechanism?
ITC allows a GST-registered business to deduct the GST paid on business purchases from the GST collected on sales. For example, if a manufacturer pays ₹5,000 GST on raw materials and collects ₹12,000 GST from customers, they pay only ₹7,000 to the government. ITC prevents cascading tax (tax on tax). ITC can only be claimed on business-related purchases; goods/services used for personal consumption or exempt supplies are not eligible. ITC claims must be matched with supplier's GSTR-1 filings.
What is the GST Composition Scheme?
The Composition Scheme is a simplified GST compliance option for small businesses with annual turnover below ₹1.5 crore (₹75 lakh for specified states). Under this scheme: (a) manufacturers pay 1% GST on turnover, (b) restaurants pay 5%, (c) other traders/service providers pay 6%. Composition dealers cannot collect GST from customers, cannot issue tax invoices, cannot claim ITC, and cannot make inter-state supplies. They file quarterly returns (instead of monthly) — reducing compliance burden significantly.
How does reverse charge mechanism (RCM) work in GST?
Under Reverse Charge Mechanism (RCM), the liability to pay GST shifts from the supplier to the recipient. This applies in specific situations: imports of services, purchase from unregistered suppliers in certain cases, specific notified supplies (e.g., GTA transport services, legal services, security services). The recipient registered under GST must pay the GST directly to the government and can then claim ITC on the same. RCM is designed to collect GST where the supplier is outside the tax net.
Are there any goods or services completely exempt from GST?
Yes. The following are exempt (0% GST): fresh fruits and vegetables, milk, eggs, meat (unprocessed), cereals like rice and wheat (unbranded), health and education services, religious services, public transport (metro, suburban trains), hotels/lodges below ₹1,000/night, agricultural services, banking services (partially), and government services. Petroleum products (petrol, diesel, ATF, natural gas) are outside GST — they are still taxed under the old VAT/excise regime.
How do I calculate the GST-exclusive price from a GST-inclusive price?
If you are given a price inclusive of GST (e.g., ₹11,800 inclusive of 18% GST), the base price is: ₹11,800 / 1.18 = ₹10,000. The GST is ₹1,800. Formula: Base Price = Inclusive Price / (1 + GST Rate/100). This is useful for businesses that need to split the GST component from a received payment, or for consumers wanting to know the base price of a purchase.
プロのヒント
For B2B purchases, always collect a proper GST invoice from your supplier with the correct GSTIN, HSN code, and tax breakup. An improper invoice (wrong GSTIN, missing fields) will block your ITC claim in GSTR-2B. ITC is one of GST's most powerful benefits for businesses — but it requires strict invoice compliance. Use GST-enabled accounting software that automatically validates GSTIN and matches invoices.
ご存知でしたか？
GST replaced 17 different central and state taxes and 23 different cesses when it was implemented on July 1, 2017 — a date the government called the 'midnight special session of Parliament.' India was the 161st country to implement GST. The first full year of GST (FY 2018-19) collected ₹11.77 lakh crore; by FY 2023-24, monthly GST collections regularly exceed ₹1.7 lakh crore, with annual collections exceeding ₹20 lakh crore — reflecting both economic growth and improved compliance.