Calculate GST — add or remove

Name: Salary Calculator
Brand: Superworks
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Forward GST (add to base price) or reverse GST (extract from inclusive price). Supports all 4 standard slabs.

All Slabs Live Calculation CGST + SGST split

GST details

Indian GST has 4 main slabs. CGST = SGST = half of total (intra-state).

Mode

Amount

GST rate

GST slabs reference

0% — essentials: milk, fresh vegetables, flour, salt.
5% — mass items: tea, edible oil, sugar, footwear ≤ ₹1K.
12% — processed foods, mobile phones, fertilisers.
18% — most services, electronics, IT, software, restaurants.
28% — luxury items: cars, ACs, cement, tobacco (with cess).

Final price (incl. GST)

₹11,800

Final price including 18% GST

Base price₹10,000

GST rate18%

Total GST₹1,800

CGST (9%)₹900

SGST (9%)₹900

Total amount₹11,800

How GST is calculated

GST is a destination-based tax on most goods and services in India. Intra-state: split into CGST + SGST. Inter-state: full amount as IGST.

01
Add (forward)
Multiply base price by GST rate to get GST amount.
```
gst = base × rate ÷ 100
total = base + gst
```
02
Remove (reverse)
Extract GST from inclusive amount via reverse formula.
```
base = total ÷ (1 + rate÷100)
gst = total − base
```
03
CGST + SGST split
Intra-state transactions: CGST = SGST = half of total GST.
```
cgst = gst ÷ 2
sgst = gst ÷ 2
```

FormulaAdd: total = base × (1 + rate%); Remove: base = total ÷ (1 + rate%)CGST + SGST always equal GST. IGST applies on inter-state transactions.

Why we use this formula by default.
Indian payroll convention, statutory references, and the SaaS tooling that runs payroll all converge on this approach. Below are the authoritative sources we cross-checked.

Statute

Central GST Act, 2017

Primary statute defining CGST/SGST/IGST framework.

Regulator

GSTN Portal

Official GST network for return filing and registration.

Authority

CBIC Notifications

Central Board of Indirect Taxes — rate notifications.

Tax SaaS

ClearTax GST

India's leading GST compliance + return filing SaaS.

Tool

Tally GST / Zoho Books

GST-compliant accounting tools widely used by Indian SMBs.

Practitioner

CAclubindia GST Forum

Active practitioner forum for GST interpretation queries.

FAQs about GST

What are the GST slabs in India?

0%, 5%, 12%, 18%, 28% — five main slabs. Plus 3% on gold, 0.25% on rough diamonds, and additional cess on demerit goods (tobacco, luxury cars).

When do I need to register for GST?

Mandatory if turnover > ₹40L (goods) or ₹20L (services). Lower thresholds for special-category states. Inter-state suppliers: mandatory regardless of turnover. E-commerce sellers: mandatory.

What's the difference between CGST, SGST, IGST?

CGST + SGST = intra-state (each half of total GST goes to centre and state). IGST = inter-state (full amount, distributed to consuming state later). Mechanically identical for the buyer.

Can I claim input tax credit?

Yes if registered. ITC = GST paid on purchases used for taxable supplies. Cannot claim on personal use, exempt supplies, motor vehicles (with exceptions), or food/beverage for staff.

What is reverse charge mechanism (RCM)?

In some cases buyer pays GST instead of seller. E.g., import of services, supply from unregistered dealer to registered, specific notified services. Buyer claims this as ITC.

When are GST returns due?

GSTR-1 (sales): 11th next month. GSTR-3B (summary + tax): 20th next month. Annual GSTR-9: by Dec 31 of next FY. QRMP scheme available for small taxpayers.

What's composition scheme?

Simplified tax for small businesses (turnover ≤ ₹1.5 Cr goods, ₹50L services). Flat tax 1-6%, no ITC. Quarterly returns. Cannot make inter-state supplies.

What is the GST on services?

Most services: 18%. Specific: restaurants 5% (no ITC) or 18% (with ITC for AC restaurants in 5-star hotels). Education and healthcare: largely exempt. Banking: 18%.

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Calculate GST — add or remove

GST details

GST slabs reference

How GST is calculated

Add (forward)

Remove (reverse)

CGST + SGST split

Central GST Act, 2017

GSTN Portal

CBIC Notifications

ClearTax GST

Tally GST / Zoho Books

CAclubindia GST Forum

FAQs about GST

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