What this tool does
Prices are shown to customers in two ways: exclusive, where tax is added at checkout, or inclusive, where tax is already inside the stated figure. Converting between them is a division, not a multiplication, and getting it backwards is the usual reason a seller under-collects. This calculator handles both directions and lists the standard rates.
How it works
To add tax to a net price, multiply by one plus the rate. To extract tax that is already included in a gross price, divide by one plus the rate. The two are not inverses of each other because the base differs, and using the wrong one produces a number that looks plausible but is wrong.
The net amount is the portion of the gross price that is actually the goods, and the tax is the remainder. This matters for accounting and for any claim you need to substantiate, so the tool reports net, tax, and gross separately rather than only the difference.
Rounding rules are set by each jurisdiction and can differ from the arithmetic result. Treat the tax figure as a working figure and confirm the final amount against your accounting system before filing.
Worked example
Extracting 18% GST that is already included in a price of 1,180.
- Gross price = 1,180
- Rate = 18%
- Net = 1,180 / 1.18 = 1,000
- Tax = 1,180 - 1,000 = 180
Net 1,000 plus 18% tax of 180 gives a gross of 1,180.
Accuracy and limitations
- Rates change. Confirm the current rate for your jurisdiction and product category before filing.
- This does not handle exempt goods, reverse charge, or multi-component invoices.
Frequently asked questions
- How do I remove VAT from a price that already includes it?
- Divide the gross price by one plus the rate. For 1,180 at 18%, that gives a net of 1,000 and tax of 180. Subtracting 18% from 1,180 directly would give 967.60, which is incorrect because the tax was never charged on the full 1,180.
- What is the difference between exclusive and inclusive pricing?
- Exclusive means the advertised price is before tax and tax is added at checkout. Inclusive means the advertised price already contains the tax. Exclusive is the norm in B2B and most of Europe; inclusive is standard in consumer retail in the UK, EU, India and Australia.
- Do I need to register before collecting this tax?
- Thresholds and rules vary by country and differ between domestic and cross-border supply. Check your local authority's current position rather than relying on a generic calculator, especially for occasional or low-value sales.