The practical difference for shoppers
In many parts of the United States, a shop displays a price before sales tax. The applicable state and local rate is added at checkout. A product marked $100 may therefore cost more than $100 when paid for. The exact rate can depend on location and product type.
In the United Kingdom and many European countries, consumer prices commonly include value-added tax, usually called VAT. A shelf price of £100 or €100 is therefore often the amount the consumer expects to pay. Business-to-business quotations may show prices before VAT, so the context still matters.
How to add tax to a net price
Convert the percentage rate to a decimal, multiply it by the pre-tax price, then add the tax. For a price of 80 and a rate of 20%, the tax is 80 × 0.20 = 16. The gross price is 96.
How to find VAT inside an inclusive price
Do not simply multiply the inclusive price by the VAT percentage. The tax is a fraction of the larger gross amount. At 20% VAT, a £120 inclusive price contains £20 VAT, not £24.
Example: comparing two offers
Suppose one seller quotes €250 including 20% VAT and another quotes €215 excluding VAT. The first offer has a net value of about €208.33. The second becomes €258 after adding 20% VAT. For a consumer who cannot recover VAT, the first offer is lower. A VAT-registered business may need to compare the net figures and confirm whether the tax is recoverable.
What a simple calculator cannot decide
- Whether a product or service is taxable, exempt, or charged at a reduced rate.
- Which location determines the applicable rate for an online sale.
- Whether shipping, fees, or discounts are taxed.
- Whether a business may recover input VAT.
- How import duties or customs charges apply.
For a real transaction, check the invoice and the relevant tax authority or a qualified adviser. For a quick estimate, use the KokoroFlow Sales Tax and VAT Calculator.