Shop uncle in my lane still says everything is 18. I used to nod. Then I started reading the HSN line on the invoice and, yeah, a atta pack and a phone charger are not sitting in the same slab.
I dont guess 18 on everything now. I look at the line. Rate is printed. Sometimes 5. Sometimes 12. Sometimes 18. Rare lines even show 28. If the print is there, I copy that number into the box. I do not invent a circular in my head.
Rates move. A item that was 12 last year can sit somewhere else after a meeting in Delhi. I will not paste fake notification numbers here. I dont keep a gazette in my drawer. You should not trust a blog for the legal rate anyway.
This page is for the split. You already have a amount. You pick the rate from the bill. The GST calculator adds tax or pulls tax out. That is the job.
If money is big, read the invoice twice. Cousin fights start when one person used 18 and the shop used 5.
Read the invoice, not your memory
Open a real bill. Not a WhatsApp forward of slabs.
Find the item line. There is usually a HSN or SAC code. Next to it, a tax percent. CGST and SGST might be written as 2.5 and 2.5, which is 5 together. Or 9 and 9, which is 18 together. IGST might be one number for interstate.
That combined percent is what you pick in the rate list on this site. 5, 12, 18, or 28.
If the bill says 9 percent CGST and 9 percent SGST, do not type 9 in the box. Type 18. The box wants the full GST.
I have done the 9 mistake. Result looked half. I thought the tool was shy. It was me.
Some restaurant bills show 5 on food and 18 on a packed water bottle. Two lines, two rates. Run the tool twice. Add the GST pieces. Dont mash both lines into one 18 percent extract. That invents tax that never existed.
If there is no GST break-up, maybe the seller is under a composition scheme, or the item is exempt, or they just printed a sloppy bill. I cannot fix sloppy. Ask them for a tax invoice if you need ITC. If you just want to know "how much tax inside this MRP", and they never charged GST as a line, extracting 18 percent is a fantasy.
MRP on a biscuit can be tax-inclusive at factory. Your kirana may still not show a GST line. Dont force the extract mode on a price that has no tax invoice behind it.
Look at the words. "Taxable value", "CGST", "SGST", "total". Those words are your friends. Memory of "most things are 18" is not a friend.
I tried this on my last laptop bill. Rate was 18. Clear. On the same month a chemist bill had 5 and 12 mixed. I would have messed both if I used one habit.
Which box to fill on this site
Go to the GST tool.
Amount is the number you already have. If the shop said ₹1,180 including tax, type 1180. If a vendor quoted ₹10,000 plus GST, type 10000.
GST rate is the dropdown. Pick what the invoice HSN line said. Dont pick 18 because it is the default and you are lazy. Default is just a common case.
What do you want is the third box. Two modes.
Amount already has GST. That is extract. Original comes out. GST comes out.
Add GST on this amount. That is for quotes that are bare. Tool adds the tax and shows the grand total.
For ₹1,180 inclusive at 18 percent, extract gives original ₹1,000 and GST ₹180. I use that example because the numbers are clean. Your bill will be uglier. That is fine.
If the bill is ₹1,050 inclusive at 5 percent, extract is a different original. Dont reuse the 1,000 story. Run the number.
Invoice GST tool is next door if you have discount first, then tax. Shop invoices often do that. Goods 10,000, 10 percent off, then 18 on the 9,000. I wrote about that separately. Same idea, extra discount box.
For a simple "tax inside this total", stay on the GST page.
CGST and SGST split is not a separate result row for filing. Intra-state 18 is 9 and 9. You can split in your head. This box shows full GST first. Filing is on the portal, not here.
I dont file from this page. You should not either. Estimate. Official GST portal and your invoice win.
Why people default to 18, and when that burns them
Office reimbursement culture trained us. "Put 18, finance will correct." Finance does correct, and then they ping you after two weeks. Ugly.
18 is common on many services and a lot of goods you buy for work. Laptop, software invoice, hotel in many cases, a cab company invoice. Common is not always.
Food grains, some everyday grocery lines, and a few life-need items have lived in lower slabs for long stretches. I am not listing a fake schedule. The list moves. Your packet has a invoice or it does not.
Gold jewellery billing is its own world. Dont run 18 on a jeweller invoice because your cousin did that on a phone. Read their line.
Works contracts, restaurants with and without AC stories you heard in 2018, those stories rot. I ignore dinner-table GST folklore. I read this month's bill.
If you sell, you already know your HSN. Use that. If you buy, use the seller's line. If you and the seller disagree, that is a classification fight, not a calculator fight. I cannot classify a product from three boxes.
When I am unsure and the amount is small, I still pick the printed rate, even if I think it looks wrong. Then I ask. I do not "correct" their invoice inside the tool and then argue at the counter with my phone.
When the amount is large, I pause. I look up the HSN on the official rate finder if I need a second opinion. I still will not paste a notification number in this article. Those numbers go stale and then this page becomes a trap.
Stale slab charts on WhatsApp are how people remit the wrong tax. I have a uncle who still forwards a 2017 image. I mute that group.
Your job on this site is smaller. Copy the percent. Split the rupees.
Add mode vs extract mode, pick one and stick
I see people add GST on a amount that already has GST. Total becomes silly. Then they say 18 percent is too much. Math was the issue, not the slab.
Rule I use. If the number is what you pay at the counter, and the bill says inclusive, extract. If the number is a quote before tax, add.
If you are not sure, look for "total" vs "taxable". Taxable is usually the base. Total is after tax, sometimes after round-off.
Round-off of ₹0.40 will not match my two decimals. Ignore 40 paise. If you are off by ₹200, you picked the wrong rate or the wrong mode.
Discount stories. Some shops discount after GST as a cash kindness. Some discount before. The invoice GST page assumes discount before tax. If your shop is the other type, this GST page on the final cash number may be cleaner. Type what you paid, extract at the rate on the tax line, and see if taxable matches their taxable. If it does not, their discount sat in a odd place. Ask them. Dont invent a fourth rate.
Two items on one invoice, 5 and 18. You cannot pick two rates in one run. Split the taxable values. Run 5 on the first pile. Run 18 on the second. Add GST. Add totals. That is how I check a mixed grocery-plus-cosmetics bill.
Composition dealers may not show GST the same way. If they say they dont charge GST, extract mode is the wrong toy.
Export invoices and SEZ stories are above this page. I will not pretend.
A few worked habits I actually use
Habit 1. Phone photo of the tax table. Zoom. Copy rate. Then open the tool. I dont type from memory while walking out of the mall.
Habit 2. If CGST and SGST are printed as amounts, I add those two amounts. That sum should sit near the GST the tool shows, if I used the right base and rate. If their CGST plus SGST is ₹90 and my tool says ₹180, I used add when I should have extracted, or I doubled something.
Habit 3. For a vendor quote on email, "25,000 plus GST". I ask "plus GST at what rate". Then I add. If they stay silent, I wait. I do not assume 18 and send a advance of 29,500. Silence is how advances go wrong.
Habit 4. Reimbursement sheet at office. I attach the invoice. I write the rate from the line. Finance can still change it. That is their job. My job is not to guess.
If you want a clean extract walk-through, how to pull original amount out of 18 percent GST uses the 1,180 example. Bill is 1,180, how much GST is inside is the same family.
Those posts still need you to confirm the rate is 18 on that bill. The title uses 18 because that bill was 18. Your chemist bill might not be.
What this article will not do
I will not publish a slab list with fake circular numbers. I will not say "as per notification XYZ all X items are 12 percent". That sentence becomes wrong and then you overpay or underpay.
I will not map every HSN. I am a office guy with a calculator site, not a classification cell.
I will not treat 0 percent, exempt, and nil as the same lecture. If the line says 0 or exempt, do not run 5 "just in case". Leave GST at zero in your head. The tool needs a rate from the list, so this page is the wrong page for a exempt line.
28 percent exists in the dropdown for a reason. If the invoice says 28, pick 28. Dont pick 18 because 28 feels rare. Rare still prints.
If your invoice rate is something the dropdown does not have, this simple box cannot help. Some special rates exist in real life. I will not invent them. Use a spreadsheet or the official method for those.
Estimate disclaimer again, because cousins skip. This split is school maths on the rate you typed. It is not a GST return. It is not a advance ruling. The invoice and the department win.
When someone asks "which rate when", the adult answer is "when the invoice says so". Boring answer. Correct answer.
If the invoice looks wrong, fight the invoice with the seller and a CA if the money is heavy. Dont fight the dropdown.
I still default to reading the HSN line first, every time, even on a ₹80 bill. That habit saved me more than any memory of slabs.