Sales Tax Calculator — GST, VAT, and Tax-Inclusive Price Calculations
Calculate prices with and without sales tax. Add or strip GST/VAT from any amount instantly. Useful for invoicing, shopping, and business pricing.
Whether you're invoicing a client, checking if a quoted price includes GST, or trying to figure out the base price before tax, the math is the same — and the CalcHub Sales Tax Calculator handles it in both directions. Add tax to a price, or strip tax out of a tax-inclusive price.
The Two Core Calculations
Adding tax to a price: Tax-inclusive price = Base price × (1 + Tax Rate / 100) Removing tax from an inclusive price: Base price = Tax-inclusive price / (1 + Tax Rate / 100)₹1,000 + 18% GST = ₹1,180
₹1,180 ÷ 1.18 = ₹1,000 (base price)
The second calculation is the one people often get wrong. They subtract 18% from ₹1,180 and get ₹967.60 — wrong! You must divide by (1 + rate), not subtract the rate from the total.
GST Rate Reference (India)
| GST Slab | Common Items |
|---|---|
| 0% (exempt) | Basic food items, healthcare, education |
| 5% | Packaged food, economy hotel stays, public transport |
| 12% | Processed food, business hotel (₹1,000–₹7,500/night), books |
| 18% | Most services, electronics, software, restaurants (AC) |
| 28% | Luxury goods, automobiles, tobacco, high-end hotels |
How to Use the Calculator
- Add tax mode: Enter base price + tax rate → see tax amount and final price
- Remove tax mode: Enter tax-inclusive price + tax rate → see base price and tax amount
- Check total: Enter amount and rate to verify invoice totals
Common Scenarios
Scenario 1: Freelancer invoicing a clientYou want to charge ₹50,000 for a project. Client is in the same state.
- Base: ₹50,000
- CGST @ 9% = ₹4,500
- SGST @ 9% = ₹4,500
- Invoice total: ₹59,000
Scenario 2: Checking if a quoted price is tax-inclusive
A vendor quotes ₹35,400 for a project "including GST" at 18%.
- Base price = ₹35,400 / 1.18 = ₹30,000
- GST amount = ₹5,400
Scenario 3: Retail pricing
You want shelf price of ₹999. What base price should you set if the product attracts 12% GST?
- Base = ₹999 / 1.12 = ₹892.86
VAT for International Context
Outside India, Value Added Tax (VAT) works on the same math. UK VAT is 20% standard rate; EU varies 17–27%. The calculator works for any percentage-based consumption tax.
One difference: in some countries, displayed retail prices are legally required to be tax-inclusive (UK, Australia), while in the US, prices are typically shown pre-tax and sales tax added at checkout. Know which convention applies before pricing internationally.
Should a small business charge GST on freelance services?
If your annual turnover exceeds ₹20 lakhs (₹10 lakhs for some special category states), GST registration is mandatory. Below that threshold, it's optional but sometimes beneficial — registered businesses can claim input tax credit on their purchases. Consult a CA for specifics on your situation.
How do I handle GST on exports?
Exports of goods and services from India are generally zero-rated for GST — meaning the rate is 0% and you can claim refunds on input GST paid. You'll need to file LUT (Letter of Undertaking) before exporting to claim this benefit. A simple calculator won't replace proper compliance guidance here.
What's the difference between tax-exclusive and tax-inclusive pricing?
Tax-exclusive: the listed price is before tax, and tax is added at the point of sale (US retail, B2B invoicing in India). Tax-inclusive: the listed price already contains the tax (retail shops in India must display MRP inclusive of all taxes). When comparing quotes or prices, confirm which convention is being used — a ₹1,000 exclusive price is more expensive than a ₹1,000 inclusive price.