Customer at my cousin's counter said, GST should be on the discounted number.
Cousin had printed GST on 10,000, then took 10 percent off the total.
Customer showed another shop's bill.
Discount first, GST after.
I said, most shop bills I see cut discount first, then GST.
I walked a 10,000 line with 10 percent off.
He was mixing two bill styles
There is a style where you give a cash cut at the end, after tax.
There is a style where the line discount lowers the taxable value, then tax sits on that.
This site's invoice tool does the second one.
Discount first, GST after.
I told him that before he opened anything.
If his own software does cash discount after GST, this page will not copy that software.
Dont force it.
Open invoice GST calculator.
This is an estimate, not an official figure.
The three boxes, the 10,000 walk
Goods / service value.
I put 10000.
That is the line before discount.
Discount.
I put 10.
The box is percent.
Not rupees.
If you gave 1,000 rupees off, that is 10 percent of 10,000, still type 10.
If you gave 800 off on 10,000, type 8.
GST rate.
I put 18%.
Calculate.
Grand total comes 10,620.00.
Taxable after discount 9,000.00.
Discount value 1,000.00.
GST 1,620.00.
That is the walk.
10,000 minus 10 percent is 9,000.
18 percent of 9,000 is 1,620.
9,000 + 1,620 is 10,620.
Customer pays 10,620 in this style.
If cousin had done GST on 10,000 first, GST 1,800, total 11,800, then 10 percent off 11,800, customer pays 10,620 too.
Wait.
11,800 minus 10 percent is also 10,620.
The payable can match.
The GST number on the bill does not.
One bill shows GST 1,800.
Other shows GST 1,620.
Input credit stories, if any, follow the taxable.
I dont give legal advice on credit.
I show the lines.
Customer was fighting the GST line, not only the payable.
On this tool, GST is 1,620.
What I dont type in those boxes
I dont put the grand total in Goods / service value.
That is the GST extract job.
Wrong page.
I dont put 1620 in Discount.
Discount is the percent you gave.
I dont pick 18 if the item is 5.
A packet of something at 5 percent with 10 percent off is a different GST.
Same discount walk, smaller tax.
Goods 10,000, discount 10, rate 5, taxable 9,000, GST 450, grand 9,450.
I ran that so he sees the rate box matters.
If he is unsure 5, 12, 18, I send GST 5, 12 or 18, which rate when.
Two items, two rates, I run the tool twice.
This page is one line.
Dont dump a mixed cart in one Goods box.
When payable matches but GST does not
I already showed 10,620 both ways on that 10 percent example.
People think matching payable means matching tax.
It dont.
It does not.
I dropped the apostrophe, you still got it.
If the discount percent on the total after GST is not the same story as discount on the goods, payables diverge.
Example.
Goods 10,000.
GST 18 on full 10,000, GST 1,800, total 11,800.
Then a flat 500 rupees off at cash desk.
Customer pays 11,300.
This tool, 5 percent discount, taxable 9,500, GST 1,710, grand 11,210.
Different.
So if his shop gives random rupee cuts at the desk, this percent box is a model, not his keyboard.
Type the percent that matches the line discount.
If there is no discount, type 0.
Then taxable equals goods.
GST is rate on that.
Grand is goods plus GST.
10,000, 0 discount, 18, GST 1,800, grand 11,800.
Simple.
I make him read every result row
Grand total is what the customer pays in this model.
Taxable after discount is the base GST sat on.
Discount value is the rupees you took off the goods.
GST is the tax.
If he only screenshots grand total, the customer will still argue the GST line.
Send the middle rows too.
I also tell him, two decimals here.
His printer may round to a rupee.
A 0.40 fight is not a raid.
If he needs to split 1,620 into 810 and 810, that is CGST SGST talk.
This invoice tool does not print that split.
The plain GST tool does a half-and-half on extract.
Different page.
For a finished inclusive number like 1,180, use bill is 1,180, how much GST is inside.
That is extract.
This is build.
Build from goods, discount, rate.
Extract from a total.
Dont mix them on one call.
Cousin's actual mistake that day
He had 10,000 in his head.
He took 10 percent, 9,000.
Then he applied 18 percent on 10,000 anyway.
GST 1,800.
Total he wanted 9,000 + 1,800 = 10,800.
Customer said that is neither style.
Not discount-then-tax.
Not tax-then-percent-off.
That is a third creature.
I see this third creature a lot.
Brain does discount on goods, then tax on the old goods.
The invoice tool will not do that unless you set discount 0 and then mentally cut the grand, which is messy.
If you want this site's model, accept GST on 9,000.
1,620.
10,620.
If you want tax on 10,000, dont type 10 in Discount.
Type 0, take 11,800, then decide your cash cut outside the tool.
Pick a style.
Write it on a paper near the counter so he dont invent a fourth style at 9 pm.
Rate 12 and rate 28, same discount habit
Goods 10,000, discount 10, rate 12.
Taxable 9,000.
GST 1,080.
Grand 10,080.
Goods 10,000, discount 10, rate 28.
Taxable 9,000.
GST 2,520.
Grand 11,520.
I ran both.
He only sells 18 stuff this month, but I want the habit.
Discount box does not change with rate.
Rate box does not change the discount rupees.
They meet at taxable.
Taxable * rate / 100 = GST.
I say it slow.
The numbers is easy when you say it slow.
The numbers are easy.
There, I fixed it, then I broke it again.
What I never claim
I never claim this matches every state rule on how a cash discount must be treated.
I never drop a fake circular.
I never say 100 percent match with his billing software.
Software has round-off, scheme discounts, free qty, two discounts stacked.
This page has one discount percent.
If he has a scheme plus a line cut, he may need two passes or a different tool, or just his software.
CalcInHand is a helper.
If a customer wants a GST invoice that his auditor will eat, cousin should use proper billing, not only this box.
This box is to see the 10,000, 10 percent, 18 percent walk without arguing at the counter.
Fill Goods / service value.
Fill Discount.
Fill GST rate.
Read Taxable after discount, GST, Grand total.
That is the call.
I told him to keep 10,620 on a sticky note for a week.
Then the customer argument gets shorter.