GST and Profit Margin: How to Price Your Products Correctly

Last updated 22 October 2026 · 9 min read

A customer pays ₹1,180 for your product, so it feels like you earned ₹1,180. You didn’t. Part of that money belongs to the government, and if you count it as income, your margin will look much healthier than it really is. Getting GST right is one of the simplest ways to keep your pricing honest.

This guide covers how GST affects margin and pricing for a small Indian business: how to take GST out of a price, how to add it back, and the slips that make margins look better than they are. The examples use 18% GST for convenience, so always use the rate that applies to your own product. If margin itself is new to you, read what is profit margin first.

Why GST isn’t your revenue

When a registered business sells goods, it usually adds GST on top of the price and passes it on to the government. You’re just the collector. The tax isn’t an earning, and it isn’t your expense either. It passes through your account on its way somewhere else.

That’s why margin has to be worked out on the price before GST. Include the tax and your revenue is inflated, your profit looks bigger, and your margin comes out too high. Make pricing decisions on a margin that isn’t real and you can end up underpricing without ever noticing.

Taking GST out of a price

A price with GST is the price before GST multiplied by one plus the rate. To go backwards, divide.

Price before GST = Price with GST ÷ (1 + GST rate)

At 18%, a customer who pays ₹1,180 has paid ₹1,180 ÷ 1.18, which is ₹1,000 for the product plus ₹180 of tax. Don’t just take 18% off ₹1,180. That gives ₹967.60, which is wrong, because the 18% was added to the smaller number in the first place.

The margin mistake, in rupees

Say your product costs ₹800 and you sell it at ₹1,180 including 18% GST. The right way to look at the margin is on ₹1,000:

• Revenue without GST is ₹1,000.
• Profit is ₹1,000 − ₹800 = ₹200.
• Margin is ₹200 ÷ ₹1,000 = 20%.

Now the wrong way. Treat the full ₹1,180 as revenue and profit appears to be ₹380, so the margin looks like 380 ÷ 1,180, or 32.2%. That gap of more than twelve points is entirely tax that was never yours. Set prices believing in a 32% margin and you’ll fall well short of the real profit you need.

Setting a price with GST

When you decide a price, flip the order. Work out the price before GST from your cost and target margin, then put GST on at the end. The full method is in how to calculate selling price.

1. Start with your cost before GST. Say ₹700.
2. Choose a target margin, such as 30%.
3. Divide the cost by one minus the margin: 700 ÷ 0.70 = ₹1,000. That’s your price before GST.
4. Add GST on top. At 18%, that’s ₹180, so the customer pays ₹1,180.

Your margin is 30% on the ₹1,000 you keep. The customer sees ₹1,180, and the extra ₹180 goes to the government. Now compare: if you set the shelf price at ₹1,000 with GST included, you’d keep only ₹847.46, which is a 17.4% margin on ₹700 of cost. A small pricing choice, a big drop in profit.

What counts as your cost?

That depends on whether you can claim credit for the GST you pay when you buy goods. A registered business that’s eligible for input tax credit can generally use it to offset the GST it collects, so for margin purposes its cost is the supplier’s price before GST. A business that can’t claim the credit pays GST on purchases as a real expense, so that tax becomes part of its cost.

The rules depend on your type of registration and your product, and they change from time to time. Businesses under the composition scheme, for instance, generally can’t collect GST separately or claim input credit. So check your own position with a qualified accountant or the official GST portal before you settle on a pricing method.

GST on marketplace sales and fees

If you sell through an online marketplace, look carefully at how fees are charged. Some are based on the price that includes GST, and the marketplace may add GST to its own fees as well. Both can cut into your margin more than the headline commission suggests. Read the fee table, add up every deduction on a few real orders, and put the true figures in your cost sheet (our pricing and profit tools page covers where to keep it). If a fee is charged on the GST-inclusive price, the real rate on your pre-GST price is a little higher than the one shown.

GST slip-ups to avoid

• Counting GST as revenue. It overstates profit and margin.
• Subtracting the rate instead of dividing. Taking 18% off ₹1,180 gives the wrong answer. Divide by 1.18.
• Adding GST before the margin. Work out the price from cost and margin first, then add the tax.
• Mixing prices with and without GST. Keep a separate, clearly labelled column for each.
• Forgetting GST on fees. Marketplace and service fees can carry their own tax, which affects your true cost.
• Using the wrong rate. Rates differ by product. Check the one for your item before you price it.

Frequently asked questions

Check one product

Take a product you sell and note the price your customer pays. Enter it in the checker above with the GST rate and your cost, and compare the real margin with the one you’ve been using. If the real figure is lower, adjust the price before GST so you earn the margin you need, then add the tax on top.

This article is for general information and education. It is not financial, tax or legal advice. GST rates, rules and eligibility change, and all rupee figures are illustrative examples. Check the current rules on the official GST portal or with a qualified tax professional before making decisions.