Calculate GST inclusive and exclusive amounts with CGST, SGST and IGST breakdown. Reverse GST, HSN codes, composition scheme and e-invoice | Calculator4U
Calculate Goods and Services Tax inclusive/exclusive amounts.
The GST Calculator is your essential tool for computing Goods and Services Tax in India, supporting both GST-exclusive (adding tax to base price) and GST-inclusive (extracting tax from MRP) calculations across all five tax slabs (0%, 5%, 12%, 18%, and 28%). Implemented on July 1, 2017, India's GST replaced 17 different indirect taxes—including VAT, Service Tax, Excise Duty, and Octroi—with a unified national tax system administered by the GST Council and the Central Board of Indirect Taxes and Customs (CBIC). Whether you are a business owner creating tax invoices, a consumer verifying retail pricing breakdowns, or an accountant handling compliance, this tool instantly breaks down your net amount, gross total, and internal tax splits.
Understanding these mathematical relationships is crucial for accurate commercial pricing, structural invoice generation, Input Tax Credit (ITC) claims, and regulatory alignment. The calculator accommodates standard dealers as well as specialized operational frameworks; for instance, **Composition Scheme businesses** (with an annual turnover under ₹1.5 crore) pay fixed, lower rates—1% for manufacturers/traders, 5% for restaurant services, and 6% for other service providers. However, composition dealers pay tax out of pocket at flat rates, cannot collect GST from their customers, cannot issue formal tax invoices, and are ineligible to claim ITC.
This calculator serves multiple stakeholders across the Indian economic ecosystem. Business owners utilize it to generate legal invoices that feature mandatory itemized tax breakdowns, while consumers use it to audit retail transactions and ensure sellers aren't charging tax over the maximum retail price (MRP). For financial professionals, it streamlines the monthly process of reconciling outward sales with tax payment summaries. Furthermore, businesses with an aggregate annual turnover exceeding ₹5 crore must comply with strict **e-invoicing mandates**—requiring them to upload every B2B invoice directly to the Invoice Registration Portal (IRP) to generate a unique Invoice Reference Number (IRN) and a signed QR code prior to goods movement or supply issuance.
GST Exclusive (Adding Tax to Base Price):
GST Amount = Base Price × GST Rate
Total Amount = Base Price × (1 + GST Rate)
GST Inclusive (Extracting Tax from MRP / Reverse GST):
Base Price = Total Amount ÷ (1 + GST Rate)
GST Amount = Total Amount - Base Price
Intra-State Split Rule:
CGST Amount = SGST Amount (or UTGST) = Total GST Amount ÷ 2
Practical Example: For a product with a ₹1,000 base price at 18% GST (exclusive), the GST equals ₹180, leading to a Total of ₹1,180. Conversely, if an item features a GST-inclusive MRP of ₹1,180 at an 18% rate, the extracted Base Price is ₹1,000 and the embedded GST is ₹180.
India's GST Council has categorized all commercial goods and services into five primary tax brackets:
| GST Rate | Category | Products/Services Examples | HSN/SAC Range |
|---|---|---|---|
| 0% | Nil / Exempt | Fresh fruits, vegetables, fresh milk, eggs, loose rice, wheat, basic educational services, public healthcare | Various |
| 5% | Essential Goods | Packaged brand food, sugar, tea, domestic coffee, coal, economy hotels (under ₹1,000), newspapers, rail tickets | 0901-2106 |
| 12% | Standard (Lower) | Processed foods, computers, mobile phones, business class air travel, hotels (ranging from ₹1,000 to ₹7,500) | 8471, 8517 |
| 18% | Standard (Higher) | Most commercial goods & services, restaurant dining, IT services, banking & financial services, consumer electronics, telecom | Most items |
| 28% | Luxury / Sin Goods | Automobiles, cement, air conditioners, tobacco products, aerated soft drinks, 5-star luxury hotels (over ₹7,500), washing machines | 8703, 2402 |
Note: Specific luxury and demerit items inside the 28% slab also attract an additional Compensation Cess (e.g., an extra 22% cess on luxury cars or 12% on aerated drinks).
Distinguishing between regional and integrated tax variations is critical for accurate invoicing and legal accounting:
| GST Type | Full Name | When Applied | Revenue Allocation | Example (On an 18% Total GST) |
|---|---|---|---|---|
| CGST | Central GST | Intra-state transactions (buyer and seller reside in the same state) | Central Government | 9% CGST line item |
| SGST | State GST | Intra-state transactions (buyer and seller reside in the same state) | State Government | 9% SGST line item |
| UTGST | Union Territory GST | Transactions taking place locally within Union Territories | Union Territory Administration | 9% UTGST line item |
| IGST | Integrated GST | Inter-state sales (across state lines), cross-border imports, and exports | Central (redistributed back to consumption states) | 18% IGST single line item |
Input Tax Credit (ITC) Utilization Rule: To eliminate cascading taxes, credits must be drained sequentially: CGST credit offsets CGST first, then IGST. SGST credit offsets SGST first, then IGST. IGST credit covers IGST balances first, then filters down to cover CGST and SGST respectively.
Ensure transactional compliance by monitoring these crucial recurring monthly and annual due dates:
| Return Type | Purpose | Filing Frequency | Due Date Guidelines |
|---|---|---|---|
| GSTR-1 | Statement of outward supplies (recording sales details) | Monthly or Quarterly | 11th of the following month (Monthly filers) or 13th of the month post-quarter (QRMP Scheme) |
| GSTR-3B | Self-directed summary return alongside final tax payment clearing | Monthly or Quarterly | 20th of the following month (Monthly filers) or 22nd–24th of the month post-quarter (QRMP, based on state tier) |
| GSTR-4 | Summarized annual filing for businesses enrolled in the Composition Scheme | Annual | April 30th following the closing financial year |
| GSTR-9 | Comprehensive annual GST return consolidation | Annual | December 31st following the closing financial year |
| GSTR-9C | Self-certified reconciliation statement (mandatory for aggregate turnovers exceeding ₹5 crore) | Annual | December 31st following the closing financial year |
Late filings attract a statutory late fee of ₹50 per day (reduced to ₹20 per day for strict Nil returns) up to a ceiling of 0.25% of turnover. Outstanding tax liabilities also incur a penal interest rate of 18% p.a. calculated from the original due date.
❌ Applying funds past the 5th day of the month: When operating monthly accounting cycles or making individual regular tracking adjustments, transaction timing is paramount. Because GST monthly filings reflect strict ledger cutoffs, delayed entries create reconciliation bottlenecks. **Fix:** Ensure domestic transactions, invoice postings, and corresponding tax balance accounts are mathematically squared before the 5th day of each calendar month to synchronize ledger entries seamlessly.
❌ Using incorrect HSN or SAC code assignments: Mishandling Harmonized System of Nomenclature (HSN) numbers or Services Accounting Codes (SAC) can result in wrong tax slab application, triggering immediate back-tax notices. **Fix:** Consistently verify definitions on the CBIC portal or execute regular verification lookups using automated registration checkers.
❌ Interchanging regional and cross-border categories: Accidentally assessing localized CGST+SGST on an inter-state shipping run—or applying IGST to a local shipment—creates deep clerical friction and completely halts your buyer's ability to extract input credits. **Fix:** Isolate the location of the supply provider relative to the consumer prior to structuring transaction totals.
❌ Recording input credits against blocked structural expenses: Filing claims on blocked items under Section 17(5) (such as company vehicle maintenance, employee wellness giveaways, or personal travel logs) leads to prompt audits, back-charges, and statutory fines. **Fix:** Route questionable business line expenses through an independent pre-audit filter before factoring them into your active credit pool.
❌ Leaving inward returns unreconciled across periods: Ignoring structural differences between your reported outbound filings and monthly auto-populated supplier documentation leads to mismatched compliance profiles. **Fix:** Build an operational routine around matching transaction accounts monthly to capture filing errors before they consolidate into permanent corporate ledgers.
Sources & Methodology: All computations are built upon statutory formulas prescribed directly by the Central Board of Indirect Taxes and Customs (CBIC) and the GST Council. Deadlines, penalty caps, and reconciliation structures track the Central Goods and Services Tax Rules, 2017 (as amended). For official lookups regarding tariff sheets, raw HSN codes, or specific state-level filing protocols, explore the official GST Portal and the GST Council. This public platform serves as an algorithmic estimation mechanism for general planning; users must coordinate their regulatory accounting schedules with a licensed Chartered Accountant or registered GST Practitioner before making final tax declarations. Information updated: January 2026.
Reverse GST formula: Base Price = Total ÷ (1 + GST Rate). GST Amount = Total − Base Price. Example: MRP ₹1,180 at 18% → Base = ₹1,180 ÷ 1.18 = ₹1,000 → GST = ₹180. For exclusive (adding to base): Total = Base × (1 + Rate). ₹1,000 × 1.18 = ₹1,180. Most Indian retail MRPs are GST-inclusive. B2B invoices show base price with GST added separately and the CGST/SGST or IGST split stated on the invoice face.
0% Nil: fresh vegetables, fruits, milk, eggs, rice, wheat, healthcare, education. 5%: packaged food, economy hotels (under ₹1,000/night), rail tickets, coal, newspapers. 12%: processed foods, computers, mobile phones, business air tickets, hotels (₹1,000–₹7,500). 18%: most goods and services — restaurants, IT, electronics, telecom, financial services. 28%: automobiles, cement, AC, tobacco, aerated drinks, luxury hotels (above ₹7,500). Some 28% items attract cess up to 22% (luxury cars) or 12% (aerated drinks) on top of the base 28%.
CGST + SGST apply to intra-state transactions — each bank half the total GST rate (18% GST = 9% CGST + 9% SGST). CGST goes to Central Government, SGST to the State. IGST applies to inter-state sales and imports — the full rate as a single tax (18% IGST), redistributed by Centre to the destination state. ITC order: IGST credit offsets IGST → CGST → SGST. Charging CGST+SGST on an inter-state sale is a compliance error and will trigger a GST mismatch notice. Always check if buyer's GSTIN state code differs from yours.
The composition scheme is for small businesses with annual turnover up to ₹1.5 crore (₹75 lakh for special category states). Fixed tax rates: 1% for manufacturers and traders, 5% for restaurants, 6% for service providers — paid on turnover, not per transaction. Cannot claim ITC, cannot issue tax invoices, cannot make inter-state supplies. File CMP-08 quarterly and GSTR-4 annually (due 30 April). Best for: local shops, small restaurants, and service providers with predominantly local customers who don't need to pass ITC to buyers.
E-invoicing requires B2B invoices to be uploaded to the Invoice Registration Portal (IRP) before issue. The IRP returns a unique IRN (Invoice Reference Number) and QR code that must appear on the invoice. As of FY 2025-26, mandatory for businesses with annual aggregate turnover above ₹5 crore. Exempted: B2C invoices, banks, NBFCs, insurance companies, SEZ units, government bodies. Penalty for non-compliance: ₹10,000 per invoice. IRP integration is available via accounting software like Tally, Zoho Books, Busy, and QuickBooks India.
ITC allows you to offset GST paid on purchases (input tax) against GST collected on sales (output tax). Example: you buy goods paying ₹18,000 IGST and sell goods collecting ₹25,000 GST — net GST payable = ₹7,000. To claim ITC: supplier must file GSTR-1 on time, invoice must appear in your GSTR-2B, goods/services must be used for business purposes, and payment must be made within 180 days. Blocked credits (personal use, employee welfare, motor vehicles for personal use, free samples) cannot be claimed. Deadline: ITC for FY 2025-26 invoices must be claimed by the November 2026 GSTR-3B filing.
GST registration is mandatory when annual turnover exceeds ₹40 lakh for goods suppliers (₹20 lakh for special category states). For service providers: ₹20 lakh (₹10 lakh for special category states). Mandatory regardless of turnover: inter-state suppliers, e-commerce sellers (including on Amazon, Flipkart, Meesho), businesses required to deduct TDS under GST, and anyone making taxable supplies under reverse charge. Voluntary registration below threshold is allowed and useful if you supply to registered businesses who need to claim ITC on your invoices.