How to Remove GST from Price
Often, you might know the final price of a product or service, but you need to figure out exactly how much of that price is tax. Whether you are generating a bill using a GST invoice format in Excel or using our Free Invoice Generator, you must list the exact base amount and the tax amount separately.
This process is called reverse GST calculation. It allows you to find the exact tax component hidden within a final price tag.
Reverse GST Calculation Formula
If the total price already includes GST, you can find the original base amount using the GST inclusive price formula:
Base Amount = Total Amount × 100 / (100 + GST Rate)
GST Amount = Total Amount - Base Amount
Example: Remove 18% GST from ₹1,180
Let's say a client pays you ₹1,180 total for freelance services. To legally bill them, you need to remove 18% GST from the total amount:
- Base Amount = ₹1,180 × 100 / (100 + 18)
- Base Amount = ₹1,180 × 100 / 118 = ₹1,000
- GST Amount = ₹1,180 - ₹1,000 = ₹180
GST Inclusive vs GST Exclusive Price
Understanding the difference is critical before registering for GST:
- GST Inclusive: The final price the customer pays (Base + Tax). Use the reverse formula above to find the tax.
- GST Exclusive: The raw base price. To find the final price, you use the GST exclusive price formula:
Total = Base Amount × (1 + GST%).
CGST/SGST vs IGST in Reverse GST
Once you extract the GST amount, you must categorize it based on your buyer's location. If the sale is within your state (intra-state), divide the extracted tax equally into CGST and SGST. If the sale is to another state (inter-state), the entire amount is booked as IGST. Note: Businesses under the GST Composition Scheme cannot collect tax, so these formulas do not apply to their customer bills.
When Should You Use Reverse GST?
You should use a GST calculator India to do reverse calculations when:
1. You are running a retail shop and quote final MRPs to customers.
2. You agreed on a fixed net payout with a freelance client and need to back-calculate your base fee for the invoice.
3. You are filing returns and need to verify tax amounts to avoid a Late GST Penalty.
Assumptions & Methodology
- Calculation: Uses standard percentage mathematics to compute exclusive (Base + Tax) and inclusive (Reverse GST) amounts.
- Tax Split: By default, intra-state transactions split the GST equally into CGST and SGST (e.g., 9% each for an 18% rate), while inter-state applies the full rate to IGST.
- Limitations: Does not calculate or offset Input Tax Credit (ITC). Does not calculate TDS/TCS under GST. It assumes you already know the correct GST rate for your good/service (HSN/SAC).
- Sources: Calculation formulas and logic are based on the Central Goods and Services Tax Act, 2017, and guidance provided on the official GST Portal and by the Central Board of Indirect Taxes and Customs (CBIC).
Frequently Asked Questions
How do I remove GST from a price?
To remove GST from a total price, divide the total amount by (1 + GST Percentage). For example, to remove 18% GST, divide the total amount by 1.18. This gives you the original base price before tax.
How do I calculate GST inclusive price?
To calculate a GST inclusive price, multiply the base price by (1 + GST Percentage). For example, a ₹1,000 item with 18% GST becomes ₹1,000 × 1.18 = ₹1,180.
What is reverse GST calculation?
Reverse GST calculation is the process of finding the original base amount and the exact tax amount when you only know the final total price that already includes GST.
How do I remove 18% GST from ₹1,180?
Using the reverse GST formula: Base Amount = 1180 / 1.18 = ₹1,000. The GST amount removed is ₹180.
Is reverse GST different for CGST/SGST and IGST?
The total reverse GST amount is the same. However, for intra-state sales, the removed GST amount is split evenly between CGST and SGST. For inter-state sales, the entire removed amount is classified as IGST.
Can I use KaroTools GST Calculator for reverse GST?
Yes! Simply toggle our GST Calculator India tool to 'Inclusive', enter the final amount, and it will instantly perform a reverse GST calculation for you.
Is GST mandatory for freelancers in India?
Not automatically. GST registration depends on aggregate turnover, the nature and location of supplies, whether a supply qualifies as an export of services, and any applicable compulsory-registration provisions or notifications. Check current CBIC/GST guidance or consult a qualified professional for your circumstances.
What is the GST registration threshold for freelancers?
There is no single answer that applies to every freelancer. Threshold exemptions and compulsory-registration rules can depend on the supplier’s location, aggregate turnover, supply type and applicable notifications. Do not use this calculator to decide whether registration is required. Verify the current rules through official CBIC/GST sources or consult a qualified professional.
Disclaimer: This GST calculator/guide is for general informational purposes only. Please verify with the official GST portal, CBIC notifications, or your CA before filing.