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GST Calculator

Calculate GST inclusive and exclusive amounts. Free GST calculator with all standard GST rates (5%, 12%, 18%, 28%) for businesses and individuals.

GST Calculator

GST Type

Calculate GST to add to base amount

Amount (Excluding GST)
GST Rate
Total Amount
₹1,180
Base Amount
₹1,000
CGST
₹90
SGST
₹90
Total GST Amount
₹180

Note: CGST + SGST applies for intra-state supply. For inter-state, IGST (full GST rate) applies. UTGST applies in Union Territories instead of SGST.

GST in India - Complete Guide

Goods and Services Tax (GST) is a comprehensive indirect tax levied on supply of goods and services in India. It replaced multiple cascading taxes and unified the tax structure across states.

GST Tax Slabs

GST RateItems Covered
0%Essential goods (food grains, fresh vegetables, milk)
5%Mass consumption items (sugar, tea, coffee, edible oil)
12%Processed food, mobile phones, ayurvedic medicines
18%Most goods and services (electronics, restaurants, soaps)
28%Luxury items (cars, tobacco, aerated drinks, ACs)

Types of GST

  • CGST: Central GST - Collected by Central government on intra-state supply
  • SGST: State GST - Collected by State government on intra-state supply
  • IGST: Integrated GST - Collected on inter-state supply (and imports)
  • UTGST: Union Territory GST - Applied in UTs instead of SGST

GST Calculation Formula

Add GST (Exclusive):

GST Amount = (Original Cost × GST Rate) / 100
Total = Original Cost + GST Amount

Remove GST (Inclusive):

Original Cost = Total / (1 + GST Rate/100)
GST Amount = Total - Original Cost

GST Demystified for Small Businesses and Freelancers

Who Needs to Register for GST

GST registration is mandatory if your annual turnover exceeds ₹20 lakhs (₹40 lakhs for goods only, ₹10 lakhs for special category states). Even below threshold, voluntary registration makes sense if your clients are GST-registered (they want input credit) or if you sell across states (mandatory regardless of turnover). Once registered, you must file returns even with zero revenue — non-filing leads to penalties of ₹500/day. Plan for GST compliance costs (₹500-2000/month for CA services) when calculating profitability.

The GST Slabs Explained

India has five GST slabs: 0% (essentials like fresh food), 5% (processed food, basic services, transport), 12% (computers, processed food, business class travel), 18% (most services, electronics, financial services), 28% (luxury items, automobiles, gambling). Most freelance services fall under 18%. Always charge GST on top of your fee — never absorb it. If you quote ₹50,000 to a client, charge ₹50,000 + 18% GST = ₹59,000. Many freelancers mistakenly absorb GST and reduce their net income.

Input Tax Credit: The Hidden Profit

GST you pay on business expenses (laptop, software, internet, office rent, business travel, professional services) can be claimed back as Input Tax Credit. This often reduces your effective GST liability by 30-50%. Common GST-eligible expenses for freelancers/small businesses: laptop and accessories (₹18% recoverable), software subscriptions (Adobe, Microsoft, Zoom — 18%), internet bills (18%), office rent if commercial (18%), business travel airfare (12%), printing and stationery (18%). Maintain GST invoices for everything — most freelancers lose ₹50,000+ annually by not claiming ITC.

Composition Scheme: Simplified GST

Small businesses with turnover below ₹1.5 crores can opt for the Composition Scheme. Pay flat 1-6% of turnover (depending on business type) instead of standard GST. Cannot collect GST from customers, cannot claim Input Tax Credit, cannot do interstate sales. Best for: small retail businesses, restaurants, small manufacturers with mostly local sales. Worst for: B2B service providers (no client wants a non-ITC vendor) and businesses with high input costs (no ITC means real loss). Calculate carefully before opting in — the simplified compliance comes at a real cost.

How a Small Business Owner Saved ₹65,000 by Understanding GST

📖 Real Story from Our Reader

Mahesh runs a digital marketing agency in Pune with ₹35 lakh annual revenue. For 2 years, he was charging clients 18% GST and depositing it. Simple. But he was not claiming Input Tax Credit (ITC) on his expenses — laptop purchases, office rent (with GST), Adobe subscriptions, internet bills, Zoom etc. When we audited, his unclaimed ITC was ₹65,000 over 2 years. We filed revised returns. Refund received: ₹65,000. GST is not just an output tax — it is also about claiming back what you paid as a business. Most freelancers and small businesses lose 10-20% of profit by not knowing this.

Common Mistakes to Avoid

After helping hundreds of readers with this specific calculation, here are the top mistakes that cost people serious money. Avoid these and you are already ahead of 80% of users:

❌ 1.

Not getting GST registered when crossing ₹20L turnover threshold (₹40L for goods)

❌ 2.

Forgetting to claim Input Tax Credit on business expenses

❌ 3.

Mixing GST collected with personal account (always keep separate)

❌ 4.

Filing GSTR-1, 3B late and incurring late fees

❌ 5.

Charging wrong GST slab (5/12/18/28 — depends on category)

AM

Written by

Anjali Mehra, CA

Frequently Asked Questions

What is the difference between CGST, SGST, and IGST?

CGST and SGST are charged together on intra-state supply (within same state). IGST is charged on inter-state supply (between states). The total tax rate remains the same regardless.

Who needs to register for GST?

Businesses with annual turnover above ₹20 lakhs (₹40 lakhs for goods) must register. Service providers above ₹20 lakhs need GST registration.

Can I claim GST input credit?

Yes, registered businesses can claim Input Tax Credit (ITC) on GST paid for business purchases against GST collected on sales. This prevents tax cascading.

What is GST composition scheme?

Small businesses with turnover up to ₹1.5 crore can opt for composition scheme - pay flat GST rate (1-6%) without ITC benefit. Simpler compliance.

Important Note

This calculator provides estimated results for informational and educational purposes only. Actual returns may vary based on market conditions, interest rate changes, taxes, and other factors. Mutual fund investments are subject to market risks. Please consult a SEBI-registered financial advisor before making investment decisions.

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