How Much Is GST? Rates, Calculations, and Examples for 2025
Few questions are as simple to ask and as messy to answer as “how much is GST?” The short reply — 10% in Australia, 5% to 15% in Canada, four different slabs in India — hides a useful truth: once you know one formula, you can work out GST on any dollar amount anywhere. This guide walks through the rates that matter and shows exactly how to calculate GST from a total price, using real numbers and real source rules.
Standard GST rate in Australia: 10% ·
Standard GST/HST rate in Canada: 5% to 15% depending on province ·
India GST slabs: 5%, 12%, 18%, 28% ·
GST rate in Ireland: 23% (standard rate) ·
Common formula for GST exclusive price: Total ÷ (1 + rate)
Quick snapshot
- Goods and Services Tax — a consumption tax on most goods and services (Australian Taxation Office (ATO) – official tax authority)
- Collected by businesses, paid by consumers (Australian Taxation Office (ATO) – official tax authority)
- Rates differ by country and sometimes by product type (Australian Taxation Office (ATO) – official tax authority)
- Australia: 10% (ATO – official tax authority)
- Canada: 5% federal GST + up to 10% provincial HST (Canada Revenue Agency (CRA) – federal tax agency)
- India: 5%, 12%, 18%, 28% slabs (ATO – official tax authority)
- Ireland: 23% standard VAT rate (ATO – official tax authority)
- GST = Price (excl. GST) × rate (Tax, Super + You – Australian government education site)
- Total (incl. GST) = Price × (1 + rate) (Tax, Super + You – Australian government education site)
- GST from total = Total ÷ (1 + rate) × rate (Tax, Super + You – Australian government education site)
- $100 exclusive + 10% GST = $10 GST (Money.com.au – Australian financial comparison platform)
- $100 inclusive at 10% = $9.09 GST (Money.com.au – Australian financial comparison platform)
- $1,000 inclusive at 10% = $90.91 GST (Money.com.au – Australian financial comparison platform)
The table below shows how GST rates vary across four countries, each applying a fixed percentage.
| Country | GST / equivalent rate | Notes |
|---|---|---|
| Australia | 10% | Applied to most goods and services sold or consumed in Australia (Australian Taxation Office (ATO) – official tax authority) |
| Canada | 5% (GST) + 0–10% (PST/HST) | Combined rate ranges from 5% to 15% depending on province (CRA – federal tax agency) |
| India | 5%, 12%, 18%, 28% | Multiple slabs depending on product type and essentiality |
| Ireland | 23% (standard VAT rate) | VAT is Ireland’s equivalent of GST; reduced rates apply to some goods |
What is the current GST rate?
GST — Goods and Services Tax — is a consumption tax that governments add to the price of most goods and services. The current rate depends on which country you’re in. There is no single global GST rate.
Does GST have different rates in different countries?
- Australia: 10% on most goods, services, and other items sold or consumed in Australia (Australian Taxation Office (ATO) – official tax authority). Australia’s GST has remained at 10% since its introduction on 1 July 2000.
- Canada: 5% federal GST, plus provincial sales tax or HST that ranges from 0% to 10%, making total rates between 5% and 15% (Canada Revenue Agency (CRA) – federal tax agency).
- India: Four main slabs — 5%, 12%, 18%, and 28% — depending on whether the product is essential, standard, or luxury.
- Ireland: 23% standard VAT rate, which is the functional equivalent of GST in the European Union.
Across all four countries, GST rates are set at fixed percentages — no sliding scales based on income or transaction value. Once you know the rate for your country, you can apply the same two formulas everywhere.
The implication: understanding the rate is the first step, and the formulas are universal across all jurisdictions.
How much GST is in $100?
This is the most common GST question online, and the answer splits cleanly into two cases: whether the $100 already includes GST or not.
What is the GST amount on $100 at 10%?
If the $100 price includes GST (the price you actually pay at checkout in Australia):
- GST component = $100 ÷ 11 = $9.09 (Moneysmart – Australian government financial guidance)
- Price before GST = $100 − $9.09 = $90.91
If the $100 price excludes GST (a sticker price before tax is added):
- GST = $100 × 10% = $10.00 (Money.com.au – Australian financial comparison platform)
- Total you pay = $100 + $10 = $110
What about $100 at 5% GST?
If the GST/HST rate were 5% (the federal GST rate in Canada before provincial additions):
- Inclusive $100: GST = $100 ÷ 21 × 1 = $4.76
- Exclusive $100: GST = $100 × 5% = $5.00
The pattern — Whether you divide by 11 (for 10% GST) or by 21 (for 5% GST), the formula is the same: GST-inclusive total ÷ (1 + rate) × rate.
For an Australian business quoting $100 on an invoice, writing “including GST” vs “plus GST” changes the tax remittance by $0.91 — a small difference per transaction that compounds across thousands of sales.
The takeaway: always clarify whether a price is inclusive or exclusive to avoid miscalculation.
How do I calculate GST?
The calculation has two directions, and mixing them up is the most common error people make.
How to calculate GST from total price?
When you have the GST-inclusive price (the final amount paid) and need to extract the GST:
- Formula: GST = Total ÷ (1 + rate) × rate (Tax, Super + You – Australian government education site)
- Shortcut at 10% GST: Total ÷ 11
- Example: A receipt for $440 including 10% GST → $440 ÷ 11 = $40 GST
- Determine whether the price is inclusive or exclusive of GST.
- Identify the applicable GST rate for your country or product.
- If the price is exclusive of GST, multiply by the rate (as a decimal) to get the GST amount, then add to the base price for the total.
- If the price is inclusive of GST, divide the total by (1 + rate) to get the base price, then multiply the base price by the rate to get the GST amount.
How to calculate GST on a calculator?
For adding GST to an exclusive price:
- Formula: Price (excl. GST) × (1 + rate) = Total (incl. GST) (Moneysmart – Australian government financial guidance)
- Shortcut at 10% GST: Price × 1.1
- Example: $200 exclusive of 10% GST → $200 × 1.1 = $220 total including GST
| Price type | Amount | GST rate | GST amount | Total incl. GST |
|---|---|---|---|---|
| Exclusive | $50 | 10% | $5.00 | $55.00 |
| Exclusive | $200 | 10% | $20.00 | $220.00 |
| Inclusive | $110 | 10% | $10.00 | – |
| Inclusive | $550 | 10% | $50.00 | – |
| Exclusive | $100 | 23% (Ireland) | $23.00 | $123.00 |
| Exclusive | $1,000 | 10% | $100.00 | $1,100.00 |
The trade-off: The divide-by-11 shortcut works only at 10% GST. For any other rate, you must use the full formula. Memorising the formula is what makes the calculation universal.
The pattern: once you internalise the ratio, you can calculate GST on any number in seconds.
How much is GST on $400?
Applying the same formulas at a larger dollar amount makes the pattern easier to see.
How to apply GST to $400 at different rates?
- $400 inclusive at 10% GST (Australia): GST = $400 ÷ 11 = $36.36. The base price before GST = $363.64 (Money.com.au – Australian financial comparison platform)
- $400 exclusive + 10% GST: GST = $400 × 10% = $40.00. Total = $440.
- $400 inclusive at 5% GST (Canada federal rate): GST = $400 ÷ 21 = $19.05.
- $400 exclusive + 5% GST: GST = $400 × 5% = $20.00. Total = $420.
- $400 exclusive + 23% GST (Ireland standard rate): GST = $400 × 23% = $92.00. Total = $492.
The implication — The same $400 invoice attracts between $19.05 and $92.00 in tax depending on which country’s rate applies. A cross-border seller quoting one price without specifying GST status risks a significant margin swing.
How much GST do you pay on $1000?
At $1,000, the difference between inclusive and exclusive pricing becomes a real budgeting issue.
What about $1000 at 23% (Ireland rate)?
- $1,000 inclusive at 10% GST (Australia): GST = $1,000 ÷ 11 = $90.91. Price before GST = $909.09 (Tax, Super + You – Australian government education site)
- $1,000 exclusive + 10% GST: GST = $1,000 × 10% = $100.00. Total = $1,100.
- $1,000 inclusive at 23% GST (Ireland): GST = $1,000 ÷ 1.23 × 0.23 = $186.99. Price before GST = $813.01.
- $1,000 exclusive + 23% GST: GST = $1,000 × 23% = $230.00. Total = $1,230.
At Ireland’s 23% rate, a $1,000 exclusive price becomes $1,230 — a $230 tax hit that a buyer might not have budgeted for. In Australia, the same $1,000 exclusive price becomes $1,100. The higher the GST rate, the more critical it is to clarify whether a price is inclusive or exclusive before the transaction.
The pattern — At every dollar amount, the ratio is fixed: inclusive GST at 10% is always 1/11 of the total. At 23%, it’s 23/123 of the total. Once you internalise that ratio, you can calculate GST on any number in seconds.
Confirmed facts
- GST is a consumption tax in many countries
- Australia GST rate is 10% and has been since 1 July 2000 (Australian Taxation Office (ATO) – official tax authority)
- India has multiple GST slabs: 5%, 12%, 18%, and 28%
- Ireland VAT (GST equivalent) standard rate is 23%
- GST inclusive $100 at 10% contains $9.09 GST (Moneysmart – Australian government financial guidance)
- GST exclusive $100 at 10% adds $10 GST
What’s unclear
- Future rate changes are not predictable — governments occasionally adjust GST rates, but no changes are currently legislated for 2025 in Australia, Canada, India, or Ireland
“GST is a broad-based tax of 10% on most goods, services and other items sold or consumed in Australia.”
— Australian Taxation Office (ATO) – official tax authority
“To work out the cost including GST, multiply the amount excluding GST by 1.1. To work out the GST component from a GST-inclusive price, divide by 11.”
— Moneysmart (Australian government financial guidance)
For an Australian business owner pricing products or a Canadian consumer comparing cross-border prices, the choice is clear: either use the divide-by-11 shortcut (when the rate is 10%) or commit the full formula to memory. Every dollar amount follows the same math — and the one number that changes everything is the rate.
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Frequently asked questions
Is GST the same as VAT?
GST and VAT (Value Added Tax) are different names for the same type of consumption tax. Australia and Canada call it GST; the UK and Ireland call it VAT; India uses GST. Both work by adding a percentage to the price at each stage of the supply chain.
Do all countries have GST?
No. The United States does not have a federal GST or VAT — instead, individual states impose their own sales taxes. Other countries, like Saudi Arabia and the UAE, introduced GST in recent years. About 160 countries worldwide have some form of GST or VAT.
Is GST 5% or 6%?
It depends on the country. Canada’s federal GST is 5%. Australia’s GST is 10%. India’s lowest slab is 5%. There is no standard 6% GST rate in any major economy — if you see 6% quoted, it may be a local sales tax or a reduced VAT rate in some European countries.
How much GST is on food?
It varies. In Australia, most basic food items are GST-free (except restaurant meals, takeaway, and prepared foods). In Canada, basic groceries are zero-rated — no GST applies. In Ireland, most food is subject to the reduced 13.5% VAT rate, not the standard 23%. India keeps essential food items in the 0% or 5% slab.
How do I claim GST back?
Businesses registered for GST can claim input tax credits — claiming back the GST they paid on business purchases. Consumers typically cannot claim GST back unless they use a Tourist Refund Scheme (available in Australia for goods taken out of the country) or similar programs in other GST countries.
What is the GST on a car?
In Australia, GST applies at 10% on the purchase price of a new or used car from a registered dealer. In Canada, GST/HST applies at the applicable rate. Luxury car taxes may apply on top in some countries. In India, cars fall under the 28% GST slab (plus a compensation cess for luxury vehicles).
Does GST apply to online purchases?
Yes, in most countries. Australia requires overseas sellers with revenue over AUD $75,000 to charge 10% GST on low-value imported goods. Canada applies GST/HST on most online purchases from foreign sellers. Ireland applies VAT at the standard rate. India requires GST on e-commerce transactions under specific supply rules.
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