| Net (ex-GST) | CGST (9%) | SGST (9%) | Gross (inc-GST) |
|---|---|---|---|
| ₹500.00 | ₹45.00 | ₹45.00 | ₹590.00 |
| ₹1,000.00 | ₹90.00 | ₹90.00 | ₹1,180.00 |
| ₹5,000.00 | ₹450.00 | ₹450.00 | ₹5,900.00 |
| ₹10,000.00 | ₹900.00 | ₹900.00 | ₹11,800.00 |
| ₹25,000.00 | ₹2,250.00 | ₹2,250.00 | ₹29,500.00 |
| ₹100,000.00 | ₹9,000.00 | ₹9,000.00 | ₹118,000.00 |
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GST Calculator — India & Australia
About this tool
GST Calculator for India and Australia — Add or Remove GST Instantly
Goods and Services Tax is charged on most goods and services in both India and Australia. Whether you are a freelancer raising an invoice, a small business quoting a client, or a consumer trying to understand what you are paying, you regularly need to move between GST-inclusive and GST-exclusive prices. This free GST calculator supports both countries in a single tool — switching between India's five-slab structure and Australia's flat 10% rate with one click. This tool runs fully in your browser — no financial data is uploaded, and your inputs are auto-saved between sessions.
India GST: India operates a dual GST structure with five rate slabs — 0% (nil), 5% (essential), 12% (standard goods), 18% (standard services and most manufactured goods), and 28% (luxury and sin goods). The tool also handles the intra-state versus inter-state split: for intra-state supplies, the GST is split equally between CGST (Central GST) and SGST (State GST); for inter-state supplies, the full GST is charged as IGST. Toggle between intra-state and inter-state to see the exact CGST, SGST, and IGST amounts on each transaction.
Australia GST: Australia has a simple flat GST rate of 10% on most goods and services. Some supplies are GST-free at 0% — including most fresh food, health services, education, and exports. Add 10% GST to a net price or strip it from a GST-inclusive price with one click.
Adding GST (net to gross): Select "Add GST," enter your net amount, and choose the applicable rate. The formula is: Gross = Net × (1 + rate / 100). At 18%, a net of ₹10,000 becomes a gross of ₹11,800. Removing GST (reverse GST): Select "Remove GST," enter the gross amount. The formula is: Net = Gross ÷ (1 + rate / 100). A gross of ₹11,800 at 18% yields a net of ₹10,000. A common mistake is subtracting the percentage from the gross — that gives a wrong answer. Always divide. For freelancers wanting to understand their take-home after tax, also see the Freelance Invoice Generator and the Budget Planner.
Features
- India GST slabs — 0%, 5%, 12%, 18%, 28%, or custom rate
- Australia GST — 10% standard, 0% GST-free, or custom rate
- Add GST mode — net price to gross price and GST amount
- Remove GST mode — gross price to net and GST element (reverse GST)
- India CGST + SGST breakdown for intra-state supply
- India IGST breakdown for inter-state supply
- Visual net vs GST breakdown bar with percentage split
- Quick-reference table for 6 common amounts at the selected rate
- Registration threshold info panel for India and Australia
- Copy full breakdown to clipboard for invoices and emails
- Auto-saves all inputs across sessions — no re-entering each visit
How to Use the GST Calculator
- 1Choose your countryClick "India" to work with India's GST slabs (0–28%), or "Australia" for Australia's flat 10% GST. The rate buttons, reference table, and info panel update automatically. Your last selection is remembered for next time.
- 2Select Add GST or Remove GSTClick "Add GST" if you have a net price (ex-GST) and need the total with GST — for example when raising an invoice. Click "Remove GST" if you have a GST-inclusive price and need to extract the net amount and the GST element — for example when reviewing a purchase to claim input tax credit.
- 3Enter the amountType the amount in the input field. If you selected "Add GST," enter the net (ex-GST) figure. If you selected "Remove GST," enter the gross (inc-GST) figure. The currency shown (INR or AUD) matches your selected country. Results update instantly as you type.
- 4Select the GST rateFor India, choose from 0% (Nil), 5% (Essential), 12%, 18%, 28%, or Custom. For Australia, choose from 10% (Standard), 0% (GST-free), or Custom. The Custom option reveals a slider and number input for any rate between 0 and 100%.
- 5India only — choose supply typeFor India, toggle between "Intra-state" (same-state buyer and seller — splits GST equally into CGST and SGST) and "Inter-state" (different states — charged as IGST). The CGST/SGST/IGST breakdown card updates immediately. The total GST amount is identical in both cases — only how it's collected differs.
- 6Read results and copyThe large hero number shows your primary answer — total inc-GST when adding, or net ex-GST when removing. The three metric cards show net, GST amount, and gross. For India, the split card shows exact CGST + SGST or IGST amounts. Click "Copy summary" to copy all figures to the clipboard for pasting into an invoice or email.
India GST guide
India GST — Slabs, Registration, and Input Tax Credit
India's GST system replaced a complex web of central and state taxes with a unified structure when it launched on 1 July 2017. The five rate slabs cover everything from essential household goods (0%, 5%) to standard goods and services (12%, 18%) and luxury items (28%). Most professional services — IT, consulting, legal, accounting — fall under the 18% slab.
Registration thresholds: Businesses with aggregate annual turnover above ₹40 lakh (goods) or ₹20 lakh (services) must register for GST. Special category states — Himachal Pradesh, Uttarakhand, Jammu & Kashmir, and North-Eastern states — have lower thresholds of ₹20 lakh (goods) and ₹10 lakh (services). Once registered, you must charge GST on all taxable supplies, file monthly or quarterly GSTR returns, and pay the net GST liability (output tax minus input tax credit).
CGST, SGST, and IGST: For a supply within the same state (intra-state), the GST rate is split: half goes to the Centre as CGST and half to the state as SGST. An 18% supply becomes 9% CGST + 9% SGST. For a cross-state supply (inter-state), the full rate is collected as IGST by the Centre, which then distributes the state's share. Use the supply type toggle in this tool to see the exact split for any transaction.
Input Tax Credit (ITC): GST-registered businesses can offset the GST paid on purchases against the GST collected from customers, paying only the difference. This eliminates the cascading tax-on-tax problem that existed under the old regime. Manage your income and expenses with the Budget Planner to track how much GST you are collecting and paying.
Australia GST guide
Australia GST — The Simple 10% System
Australia's GST, introduced on 1 July 2000, is one of the simplest GST systems in the world — a flat 10% rate on most goods and services with a clean set of GST-free categories.
GST-free supplies (0%): Basic food (fresh produce, bread, meat, dairy, eggs), most health services (doctor visits, hospital care, medicines), most education services (school fees, TAFE, university), and exports. Businesses making GST-free supplies can still claim input tax credits on their purchases — unlike input-taxed supplies (such as financial services and residential rent), where no ITC can be claimed.
Registration threshold: You must register for GST if your annual GST turnover is A$75,000 or more (A$150,000 for non-profit organisations). Once registered, you charge 10% GST on taxable supplies, issue tax invoices, and lodge a Business Activity Statement (BAS) — typically quarterly — reporting GST collected and claiming credits for GST paid on purchases.
The 1/11th rule: A quick way to find the GST component in a GST-inclusive price is to divide by 11. For example, a total of A$110 has a GST component of A$110 ÷ 11 = A$10. This is mathematically identical to dividing by 1.10 and subtracting — the 1/11th shortcut is just faster for mental arithmetic. This calculator does the precise arithmetic for you instantly. If you also invoice UK clients and need to check VAT, use the VAT Calculator UK.
Common Use Cases
Frequently Asked Questions
To add GST to a net price in India, multiply the net amount by (1 + GST rate/100). For example, to add 18% GST to a net price of ₹10,000: Gross = ₹10,000 × 1.18 = ₹11,800. The GST amount is ₹1,800. For intra-state supply, this splits equally into CGST of ₹900 (9%) and SGST of ₹900 (9%), both collected by the respective governments. For inter-state supply, the full ₹1,800 is collected as IGST. This calculator handles both scenarios instantly — enter your net amount, select the GST slab, and choose intra-state or inter-state supply.
To remove GST from a GST-inclusive (gross) price, divide the gross amount by (1 + GST rate/100). For example, to remove 18% GST from a gross price of ₹11,800: Net = ₹11,800 ÷ 1.18 = ₹10,000. The GST element is ₹11,800 − ₹10,000 = ₹1,800. A common mistake is to subtract the GST percentage from the gross price (₹11,800 − 18% = ₹9,676), which gives the wrong answer. Always divide by the gross factor (1.18 for 18% GST). Select "Remove GST" in this calculator and enter the gross amount — the net price and GST amount appear instantly.
India has five GST rate slabs set by the GST Council (stable since July 2017): (1) 0% (Nil) — essential items like fresh vegetables, milk, bread, eggs, educational services. (2) 5% — essential goods and services such as packaged food, life-saving drugs, economy class air travel, small restaurants. (3) 12% — standard goods including processed foods, computers, mobile phones (pre-2020), business class air travel. (4) 18% — standard services and goods including restaurants (AC), telecom, financial services, IT services, most manufactured goods. (5) 28% — luxury and sin goods such as automobiles, tobacco products, aerated drinks, high-end consumer durables. A cess is levied on top of 28% GST for certain luxury and demerit goods. Source: cbic.gov.in.
GST in India has a dual structure: CGST (Central GST) is collected by the central government; SGST (State GST) is collected by the state government; IGST (Integrated GST) applies to inter-state transactions and goes to the central government (which then transfers the state's share). For intra-state supply (buyer and seller in the same state): the total GST rate is split equally between CGST and SGST. For example, 18% GST = 9% CGST + 9% SGST. For inter-state supply (buyer and seller in different states): the full GST rate is charged as IGST. For example, 18% GST = 18% IGST. The total GST amount is the same in both cases — only how it is collected and distributed differs.
In India, GST registration is mandatory once your annual aggregate turnover exceeds: ₹40 lakh for businesses supplying goods (₹20 lakh for special category states like Himachal Pradesh, Uttarakhand, J&K, and North-Eastern states); ₹20 lakh for service providers (₹10 lakh for special category states). Some businesses must register regardless of turnover — including those making inter-state supplies, e-commerce operators, and casual taxable persons. Voluntary registration is allowed below the threshold and can benefit businesses that want to claim input tax credit (ITC) on their purchases. Source: cbic.gov.in.
Australia has a single flat GST rate of 10%, which has remained unchanged since it was introduced on 1 July 2000. To add GST to a net price, multiply by 1.10. For example, a net price of A$100 becomes A$110 GST-inclusive. To remove GST from a GST-inclusive price, divide by 1.10. For example, a gross price of A$110 has a net price of A$100 and a GST component of A$10. Some goods and services are GST-free (0%): basic food (fresh produce, bread, meat, dairy), most health services, most education services, and some exports. Source: ato.gov.au.
Businesses with an annual GST turnover of A$75,000 or more must register for GST in Australia. Non-profit organisations have a higher threshold of A$150,000. Once registered, you must include GST in the price you charge customers, issue tax invoices for sales over A$82.50, and lodge a Business Activity Statement (BAS) — either monthly, quarterly, or annually. You can also claim credits for the GST included in your business purchases (input tax credits). Taxi and ride-sharing drivers must register regardless of turnover. Voluntary registration is allowed below A$75,000 if you want to claim input tax credits. Source: ato.gov.au.
Yes. Under India's GST system, registered businesses can claim Input Tax Credit (ITC) for the GST paid on business purchases and expenses, and offset it against the GST collected from customers. For example, if you collected ₹18,000 GST from clients (output tax) and paid ₹5,000 GST on supplies (input tax), you pay only ₹13,000 to the government. ITC is available only to GST-registered businesses, only on purchases used for business purposes, and only if the supplier has also filed their GST returns. ITC cannot be claimed on personal expenses, motor vehicles (with exceptions), food and beverages, or club memberships. Source: cbic.gov.in.