GST Calculator — Add or Remove GST Instantly — India 2026
Free online GST calculator for all slab rates 5% 12% 18% 28%. Calculate GST inclusive and exclusive amounts with CGST SGST and IGST breakdowns.
Goods and Services Tax is a comprehensive indirect tax that replaced multiple taxes like VAT excise duty and service tax when it was introduced on July 1 2017. Whether you are a business owner creating invoices a freelancer calculating service tax or a consumer wanting to know the tax component of a purchase our GST calculator makes it simple. Just enter the amount and GST rate to get instant results with CGST SGST and IGST breakdowns.
What are the different GST rates in India?
India has four GST slab rates. 5% applies to essential items like packaged food and economy rail tickets. 12% applies to cell phones computers and processed food. 18% covers most services and standard goods including restaurant dining. 28% is reserved for luxury items like automobiles premium electronics and aerated drinks. Some items like unpackaged food grains are exempt at 0%.
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GST Calculator
How Tax Calculation Works
Income tax is calculated on your total taxable income after deducting eligible exemptions and deductions from your gross income. The tax is applied progressively — you pay a lower rate on initial income slabs and higher rates only on income that exceeds each threshold. This means moving into a "higher tax bracket" does not mean your entire income is taxed at the higher rate. Understanding marginal vs effective tax rate is crucial: your marginal rate applies only to the last rupee earned, while your effective rate is the average across all slabs.
Tax-Saving Strategies
Under the old regime, maximize deductions: Section 80C allows up to Rs 1.5 lakh through PPF, ELSS, EPF, and life insurance. Section 80D covers health insurance premiums up to Rs 25,000 (Rs 50,000 for senior citizens). Section 80CCD(1B) offers an additional Rs 50,000 deduction for NPS contributions. Home loan interest up to Rs 2 lakh is deductible under Section 24. Under the new regime, the Rs 75,000 standard deduction and lower slab rates may save you more if your total deductions are below Rs 3.75 lakh. Calculate under both regimes before choosing.
Key Information
| Parameter | Details |
|---|---|
| GST Slab Rates | 5% 12% 18% 28% |
| For Intra-State Sales | CGST + SGST (equal split) |
| For Inter-State Sales | IGST (full rate) |
| GST Registration Threshold | Rs 40 lakh (Rs 20 lakh for services) |
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Use Calculator NowFrequently Asked Questions
What are the different GST rates in India?
India has four GST slab rates. 5% applies to essential items like packaged food and economy rail tickets. 12% applies to cell phones computers and processed food. 18% covers most services and standard goods including restaurant dining. 28% is reserved for luxury items like automobiles premium electronics and aerated drinks. Some items like unpackaged food grains are exempt at 0%.
How to calculate GST from total amount?
To find the GST component from a GST-inclusive total use this formula: GST Amount = Total Amount x GST Rate divided by (100 + GST Rate). For example if your total bill is Rs 1180 with 18% GST then GST = 1180 x 18 / 118 = Rs 180 and the base amount is Rs 1000.
Do I need GST registration?
You need GST registration if your annual turnover exceeds Rs 40 lakh for goods or Rs 20 lakh for services. These thresholds are Rs 20 lakh and Rs 10 lakh respectively for North-Eastern states. E-commerce sellers interstate sellers and those making taxable supplies must register regardless of turnover.
Which tax regime should I choose — old or new?
Choose the new regime if your total deductions are below Rs 3.75 lakh. Choose the old regime if you claim HRA, 80C (Rs 1.5L), 80D, home loan interest, and NPS totaling more than Rs 3.75 lakh. Salaried employees can switch every year.
Is income up to Rs 12 lakh really tax-free?
Under the new regime for FY 2025-26, income up to Rs 12 lakh is effectively tax-free due to Section 87A rebate. After Rs 75,000 standard deduction, taxable income is Rs 11.25 lakh which qualifies for full rebate. However, income even slightly above Rs 12 lakh loses this entire benefit.
How can I save more tax legally?
Under the old regime, maximize 80C (Rs 1.5L via PPF, ELSS, EPF), 80D (Rs 25K-50K for health insurance), 80CCD(1B) (Rs 50K for NPS), HRA exemption, and home loan interest (Rs 2L under Section 24).
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Last updated: March 2026