Unlocking The Mystery: Finding GST From The Total Amount

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Introduction to GST Calculation

Many countries have their own taxation systems, and due to the differences in the taxation system, GST has revolutionized various businesses interacting with this system. 

Since goods and tax services have their benefits, one must have the skill to calculate them. Let’s delve deep to know the basics of GST, different GST calculation methods, and the tools and resources to calculate GST. 

Aspects of GST

Following are the aspects of GST that should be known by anyone who has to incorporate the calculation of GST. These concepts are beyond the basic GST concept. These are: 

  • Import and Export Process: Any business or company that is involved in the import and export process has to go through certain GST requirements and documentation.
  • Reverse charge mechanism: In this mechanism, its foundation is based on the reverse payment. It shifts the payment of GST from the supplier to the recipient. 
  • Compound levy: Certain goods and services are levied to pay GST on top of any other tax. This in whole requires certain calculations. 

Calculation tools and resources

There are certain calculations and aspects to cater to return file assistance, automated calculations, and management features for compliance. To calculate and analyze them, there are various online tools and software available on the market. 

These tools and software have a range of basic to secondary software packages to simplify the calculations for the GST. They also solve all the queries related to how to calculate GST from the total amount. 

What are GST rates and slabs?

Various rates of tax are applied to goods and services. These rates are given another term in the world of economics. This term is known as “slabs.”. 

The word slab is given to these rates to bridge the gap between the generated revenue and the affordability of the items. There are some of the common slabs of GST, such as zero rate, exempt rate, high rate, reduced rate, and standard rate. 

  1. The exempted cases are those in which goods and services are exempted from paying any taxes. Most of those goods are either food and medicine, or they can be educational. 
  2. The higher rate is applied to goods that fall under the category of luxury items. These can be watches, handbags, perfumes, chocolates, or makeup. 
  3. The reduced rate is for those products that are related to medicines and food. 
  4. The standard rate of tax is mostly applied to goods and services, and it can range from 5% up to 20%.
  5. The zero rate is applied to exporting sectors such as handicrafts and agricultural projects. 

The basic calculation for the GST

Before you begin to calculate the GST on any certain goods or services, it’s important to know the tax rate and the taxable value as well. 

The GST calculation formula is as follows:

                         Taxable Value x GST rate

                         ———————————   = GST


The rate of the tax also differs when it comes to intrastate and interstate transactions. When the transaction is made intra-state, both the CGST and the GST apply to the goods and services. Using this formula helps you find GST from the total amount. 

When it comes to interstate transactions, the IGST is applied only to goods and services. 

Components of GST Calculation

There are some of the basic tools and resources available to calculate GST. These are the GSTN portal, online GST calculators, and seeking professional aid. All of these components have their importance in calculating the GST figure. 

The GST portal is the official portal that comes up with various prices for different goods and services. The portal has tables with written GST rates; these tables can be downloaded. 

Multiple websites offer online calculators to calculate the GST. All you have to do is put up the value and come up with an answer to it. GST calculation steps are mentioned on the portal as well. 

Lastly, the best way is to seek help from a professional or a tax advisor who is a master to guide you about compliance with GST regulations. 

There are four fundamental components to understanding the methodology of GST. These are:

  1. Integrated goods and services tax: The central government imposes this kind of tax on the goods which is levied on the taxable person. 
  2. Central goods and services tax: Similar to the integrated goods and services tax, this is imposed by the central government and has to be paid by the person. 
  3. State goods and services tax: The state government is levied to collect the total amount of tax. It’s levied on the intra-state supply of goods and services. It also has a tax range from 0 to 28%, similar to CGST. 
  4. Union territory goods and services tax: This category of tax is applied to intrastate transactions. The tax rate is somehow similar to that of SGST. This tax is collected by the Union government and works in a similar way as SGST. 

After having a thorough understanding of the components and calculations of GST, let’s get to the inclusive and exclusive prices. 

Inclusive Price

When the taxable value has to be calculated excluding GST from an inclusive price, the following is the formula:

Gross price 

——————-  = Taxable Value

100+ GST rate

Exclusive Price

When the total price is needed to be calculated, including the GST from an exclusive price, the following formula is to be used: 

Taxable Value x (100 + GST Rate)

———————————————   = Gross Price


The formula for calculating GST

Calculating the GST, analysing the tax rate, and understanding the taxation on goods and services have never been that easy for most industries and businesses. 

To smoothly go along with the financial matters and to ensure compliance and taxation regulations, it’s mandatory to correctly calculate the GST. For the calculation, it’s equally important to follow the exact formula to get an exact figure. 

Let’s get to know the formulations to calculate GST under different scenarios:

  • Calculation of GST when GST is excluded: This is one of the most used strategies in businesses where the GST rate is exclusive of the net price. The formula to calculate this is:

                         Vos x GST rate 

                        ———————  = GST amount


  • Calculating the net price when GST is inclusive: The formula when the net price has an inclusive GST will be:

                              Inclusive price x 100


                                 100+ GST Rate

  • Additional consideration: You should also take into consideration compounding effects, tax invoices, and cross-calculations when you formulate the tax rate for calculating GST. 
  • Apart from the basic formulas: Apart from the formula, it’s important to know various other concepts as well, such as GST rate slabs, filing GST returns, and input tax credits. 
  • Technology and support: Some multiple tools and software help calculate the GST. However, relying on these tools and software can lead to several mistakes and issues with compliance as well. You can get help from professionals or seek help from a tax advisor if the matter is uncertain. 

The GST calculation steps need to be followed, as these give an exact figure of GST. These steps are mandatory when you put a value in the formula to find out the exact figure. While the process is crucial, it needs a thorough understanding and should be followed step by step. 

Also Read: Demystifying GST Calculations: A Comprehensive Guide For Sales And Purchases

Finding GST from total amount – Methods and Techniques

The algebraic expression for finding out the GST is very powerful as it unlocks the unknown value. The formula holds TA, which represents the total amount. The GST (R) represents the amount upon which the tax is levied. Lastly, Cess is an optional figure. This figure is levied on top of the GST rate. 

Apart from this, the formula also depends on the inclusive and exclusive prices. In the exclusive price, the GST is hidden in the total amount. To find out the hidden value, the following formula needs to be used:

Total amount x R 

———————-  = GST amount 


When the price is already given and the value of goods and services is needed to be known, the following formula is to be used: 

Total Amount x 100

————————-  = Net price 

        100 + R 

While these formulas help find out the value, there is some other technical and additional information that one must have. These are:

  1. GST interaction and import duty: The relationship between GST and import duty needs thorough understanding and attention. Customs regulations and tax experts are best suited to cater to such issues. 
  2. Compounding calculation: Certain problems may occur in compound calculation, so it’s best to look for a professional’s help. 
  3. Software solution: The basic calculations needed to find out the GST rate can be done via online tools and different software. While these tools and software are good, you cannot solely rely on them. It needs to have a fundamental understanding to calculate GST. 


Finding the correct tax rate and figuring out the total GST amount on a certain good or service can be the most perplexing and challenging tasks for business individuals.

To find out the taxation and hidden GST in an amount, it’s essential to understand the cost of a transaction and have relevant information on businesses and current tax rates. This requires thorough experience and practice as well. 

The formula needs to be thoroughly practiced to find out the correct GST value. However, if things seem tangled and there is no way out, the best is to hire a tax consultant who can look after the matter and bring out the best solution for your business. 


Q1. How do you figure out the GST from the total amount?

To know how much to add to the GST amount, simply multiply it by 0.1. Further, if you are willing to calculate the total price, which includes GST, you need to multiply it by 1.1. 

Q2. How do I drive back the GST from the final amount?

First, you need to calculate the base price, or the amount that is exclusive of the GST, to find the GST. This amount can be achieved by using a formula. Firstly, the base price is calculated, from which you can further determine the reverse GST amount. To calculate the reverse GST amount, subtract the base price from the GST inclusive amount. 

Q3. How do you get the GST amount?

Whatever the total sales price of a particular good is, you can multiply it by 3. The achieved result is further needed to be divided by 23. That’s how you can find the GST amount of a certain product. 

Q4. What is the percentage of the formula?

You can get it in the form of a percentage with an increase or decrease in the quantity of the product. The following formula is used when the percentage of a number is needed to be calculated out of a number:


—————— x 100

  Total number

This formula needs to be followed step by step to find out the exact figure. 

Q5. What is the GST rate?

The GST rate is categorized into four slabs. This categorization is usually followed in the Indian region. These slabs are at a percentage of 28%, 18%, 12%, and 5%. 

Q6. What is the GST rate for imports?

An 18% GST rate is implied on all imported goods and services. However, this 18% does not apply to goods that are exempted or have a reduced rate. 

Q7. What are capital goods in GST?

Different categories of assets, such as vehicles, tools, machinery, equipment, buildings, and any other asset that is required by an organisation to produce a variety of goods and services, are called capital goods in GST. 

Q8. What are the four types of tariffs?

The following are the types of tariffs. These are:

  1. Ad Valorem tariff
  2. Specific tariff
  3. Compound 

Q9. Which country has the highest tax slab under GST?

India has the highest tax slab among 140 countries. The tax slab is recorded at 28% in India, which has set the bar. 

Q10. What are the three types of quotas?

The sales quota is of three types. These are:

  1. Profit based
  2. Revenue-based

Volume Based 

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Amitha Shet Content Writer
Amitha is a creative enthusiast, which gets her into educating the world about things she comprehends. Finance, business, and digital transformation are the topics that she is profoundly interested in so that she can make things simpler for the audience. She is currently a content strategist for a fintech company. She holds a Bachelor of Engineering in Civil Engineering, although finance is a niche that piques her interest to not just educate but to invest and gain experience.

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