GST kalkulaator

Add or reverse GST for Australia, NZ, Canada and Singapore

This free GST calculator works in both directions: add GST to a net price to get the total your customer pays, or remove (reverse) GST from a tax-inclusive price to find the amount before tax and the GST it contains. One-tap country presets load the correct rate — Australia 10%, New Zealand 15%, Singapore 9% and Canada 5% — or you can type any custom rate for India, the UK (VAT) or any other jurisdiction.

The currency follows the country you pick (AUD, NZD, SGD or CAD), so the figures read like a real invoice. There's no submit button: the breakdown updates as you type, and a shareable link lets you send a specific calculation to a colleague or client instantly without copying numbers manually.

How to calculate GST — the formulas explained

Adding GST is a single multiplication. GST = amount × rate ÷ 100, and the GST-inclusive total = amount × (1 + rate ÷ 100). So an Australian GST calculator at 10% turns a A$1,000 net price into A$100 GST and a A$1,100 total — the same as multiplying by 1.10.

Reversing GST is just as straightforward. To pull the tax out of a GST-inclusive figure, divide by 1 plus the rate: net = total ÷ (1 + rate ÷ 100). A A$1,100 inclusive price at 10% becomes A$1,000 net with A$100 of GST. For the common Australian case there's an even quicker shortcut — the GST inside any price is simply price ÷ 11. The tool applies whichever formula fits the mode you've chosen, so you never need to remember which one to use.

GST-inclusive vs GST-exclusive pricing

A GST-exclusive (net) price is shown before tax; a GST-inclusive (gross) price already has the GST baked in. The distinction matters because the rules differ by audience: in Australia and New Zealand, prices advertised to consumers must be displayed GST-inclusive under consumer protection law, so the ticket price is what you actually pay. Business-to-business quotes, on the other hand, are usually written GST-exclusive with the tax added as a separate line on the invoice.

Knowing which kind of price you have tells you which mode to use here — 'Add GST' for a net price you want to mark up for an invoice, or 'Remove GST' for an inclusive price you need to break down for bookkeeping or an expense claim.

GST rates around the world

Rates vary widely. Australia has charged a flat 10% GST since 2000; New Zealand's is 15%; Singapore moved to 9% in 2024; and Canada levies a 5% federal GST, with provinces adding their own PST or a combined HST of up to 15%. India runs a multi-slab system of 5%, 12%, 18% and 28%. The UK uses VAT at 20% for standard goods. GST and VAT are the same family of consumption tax under different names — the US is the outlier, using a single-stage sales tax instead.

Because rates and thresholds change, treat the presets here as a fast starting point and confirm the current rate with your local tax authority — the ATO for Australia, Inland Revenue for New Zealand, the CRA for Canada — before issuing an invoice or filing a return.

Reverse GST and finding the GST hidden in a price

One of the most common tasks is working out how much GST is already inside a price — for expense claims, bookkeeping or checking a supplier receipt. The reverse mode does exactly that: enter the gross amount, pick the rate, and the tool shows the pre-tax price and the GST portion side by side. For a A$57.50 fuel receipt at 10%, that's A$52.27 net and A$5.23 GST — figures you'd need to enter separately in accounting software like Xero or QuickBooks.

Whether you're pricing a product for export (where GST often doesn't apply), raising a quote for a GST-registered business client, or reconciling an invoice against a bank statement, copy the plain-text summary or share the link so the exact numbers travel with you.

Private, instant and free — no account, works on all devices

There's nothing to install and no account to create. The whole calculation — adding GST, reversing GST, the net/GST/total breakdown and the country rates — happens locally in your browser, so your figures never leave your device. Xero and MYOB both include GST calculation tools, but they require monthly subscriptions of A$15–A$60+ just to access the calculator inside the broader accounting suite. UtiloKit is completely free. Bookmark it as your go-to GST calculator for Australia, New Zealand, Canada and beyond — on iPhone, Android, Windows or Mac — and use it as often as you need with no limits.

India's four-tier GST rate structure explained

India's GST system uses a four-tier rate structure — 0%, 5%, 12%, 18% and 28% — rather than a single flat rate. The 0% (nil) slab covers essential goods that the government treats as too basic to tax: fresh vegetables, milk, eggs, curd, unbranded grain, contraceptives and printed books all sit here, ensuring necessities remain affordable. The 5% slab covers items of mass consumption where some revenue is collected without burdening households disproportionately — sugar, tea, coffee, edible oils, domestic LPG cylinders, kerosene for PDS and economy-class air travel all attract 5%.

The 12% slab is the first 'standard' band and covers processed foods and mid-range goods: butter, ghee, frozen meat, fruit juices, smartphones and most packaged food products fall here, as do some construction materials and business-class air travel. The 18% slab is the workhorse of the system — it covers most manufactured goods, most services (including restaurant meals in air-conditioned restaurants, hotel rooms priced below ₹7,500 per night, telecom, financial services and most professional services), as well as items like cameras, refrigerators and hair dryers.

The 28% slab applies to luxury and sin goods: passenger cars, motorcycles above 350cc, aircraft for private use, tobacco products, pan masala, aerated drinks and high-end hotel rooms priced above ₹7,500 per night. On top of 28% GST, a Compensation Cess is levied on certain items — cigarettes, pan masala and luxury cars attract a cess of anywhere from 5% to 290% of the transaction value, stacking the total tax burden significantly higher than 28%. The GST Council reviews slab assignments periodically, so it's always worth verifying the current rate for a specific HSN code with official sources before raising an invoice.

CGST, SGST, IGST and UTGST — how GST is split between Centre and State

India's GST is constitutionally a dual levy: every transaction attracts two charges simultaneously rather than one. For intra-state supplies (buyer and seller in the same state), the applicable rate is split equally between CGST (Central GST, collected by the Union government) and SGST (State GST, retained by the state). If a supply attracts 18% GST, the invoice shows 9% CGST and 9% SGST as two separate line items — the supplier deposits each portion to the respective government. For supplies made in or to a Union Territory without a legislature (Dadra & Nagar Haveli, Lakshadweep, etc.), UTGST replaces SGST and works identically.

For inter-state supplies — goods or services crossing a state border, imports, or exports — a single IGST (Integrated GST) applies at the full rate (18% IGST rather than 9% CGST + 9% SGST). IGST is collected entirely by the Centre and then settled to the destination state through the IGST mechanism, preserving the destination-based principle that GST revenue accrues to the state where consumption happens. This distinction matters enormously for B2B invoices and Input Tax Credit (ITC) claims: a business can set off IGST paid against CGST or SGST output liability and vice versa, but CGST cannot be set off against SGST — the cross-utilisation rules are specific and failure to follow them creates mismatches that invite GST audit notices.

Getting the levy right at the invoice stage is non-negotiable. Charging CGST + SGST on what is actually an inter-state supply (and should have been IGST) means the supplier has paid state tax instead of integrated tax, and the buyer cannot validly claim ITC. Rectifying the error requires credit notes, revised returns and often a refund application — administrative headaches that a correct calculation at the outset entirely avoids.

Input Tax Credit (ITC) — how businesses reduce their net GST liability

Input Tax Credit is the mechanism that makes GST a non-cascading tax. In every GST period, a registered business calculates its output tax (GST collected on sales) and subtracts its input tax (GST paid on purchases used in the business) — the difference is the net GST payable to the government. If a manufacturer buys raw materials paying ₹18,000 GST and sells finished goods collecting ₹32,000 GST, it remits only ₹14,000; the ₹18,000 already paid to its suppliers flows forward as a credit rather than becoming an embedded cost in the price. This chain of credits up and down the supply chain is what theoretically stops taxes from stacking on taxes.

ITC eligibility, however, comes with strict conditions. The supplier must have filed GSTR-1 and the invoice must appear in the buyer's GSTR-2B (the auto-populated ITC statement); the invoice must carry the buyer's GSTIN; the goods or services must have been used for a taxable business purpose; and the goods must actually be received. Section 17(5) of the CGST Act blocks ITC on several categories regardless of business use: food and beverages, membership of clubs and health centres, life and health insurance for employees (except where mandatorily required by law), works contracts for construction or renovation of immovable property, and motor vehicles for personal transport below a certain seating capacity. Claiming blocked credit is a common compliance error that attracts demands plus 18% interest.

The ITC reconciliation process — comparing the buyer's purchase register against GSTR-2A (dynamic) and GSTR-2B (locked monthly) — is a monthly discipline. Discrepancies arise when suppliers file late, amend invoices or fail to report a supply. Rule 36(4) restricts ITC to 105% of the amount appearing in GSTR-2B, meaning buyers cannot freely claim credit for invoices their supplier has not yet reported. Staying on top of GSTR-2B mismatches and chasing suppliers to file is therefore a direct cash-flow concern, not merely a paperwork obligation.

GST returns, filing obligations and the Composition Scheme

A regular GST registrant files at minimum two returns per month: GSTR-1 (details of all outward supplies, due by the 11th of the following month) and GSTR-3B (a consolidated summary return with self-assessed tax payment, due by the 20th). Businesses with turnover under ₹5 crore can opt for the QRMP scheme (Quarterly Return Monthly Payment), filing GSTR-1 quarterly while still paying estimated tax monthly. The annual return GSTR-9 consolidates the whole year and is due by 31 December following the financial year; businesses above ₹5 crore must also file GSTR-9C, a self-certified reconciliation statement audited by a chartered accountant. Late fees for GSTR-3B are ₹50 per day (₹20 for nil returns), while interest at 18% per annum applies on unpaid tax — making timely and accurate filing a direct financial imperative.

The Composition Scheme offers relief to small businesses with aggregate turnover under ₹1.5 crore (₹75 lakh for some service providers). Instead of filing multiple returns and maintaining invoice-level records, a composition dealer pays a flat rate on turnover — 1% for traders and manufacturers, 5% for restaurants — and files quarterly. The trade-off is significant: composition dealers cannot collect GST from customers, cannot claim ITC, cannot make inter-state supplies, and must clearly mark all bills as 'composition taxable person — not eligible to collect tax on supplies.' For micro-businesses with simple operations and mostly B2C customers, the reduced compliance burden outweighs these constraints; for anyone in a B2B supply chain, composition status breaks ITC flow for their buyers and is typically unworkable.

The e-invoicing mandate adds another layer of compliance for larger businesses. Entities with aggregate turnover above ₹5 crore must generate a digitally signed Invoice Reference Number (IRN) from the Invoice Registration Portal (IRP) for every B2B invoice before it is issued. The IRP validates the invoice, assigns the IRN and QR code, and simultaneously populates GSTR-1, eliminating manual data entry for the return. The Reverse Charge Mechanism (RCM) further complicates calculations for certain procurement categories — import of services, goods transport agencies, legal services from advocates, directors' fees and purchases from unregistered suppliers in notified categories all require the recipient to self-assess and pay GST directly to the government in cash, without the option to offset ITC against that liability in the same month. Understanding these layers is why even a conceptually simple 18% rate on a service can translate into a multi-step payment, filing and reconciliation exercise for the finance team.