How to Calculate VAT Backwards from a Gross Price
To extract VAT from a gross (VAT-inclusive) price, use the formula: VAT Amount = Gross Price - (Gross Price / (1 + VAT Rate)). For example, with a 20% VAT rate and a gross price of $120: Net = $120 / 1.20 = $100, and the VAT amount is $20. A quick shortcut for 20% VAT: divide the gross amount by 6 to get the VAT. For 25% VAT, divide by 5. This reverse calculation is essential when you receive invoices or receipts showing only the total and need to determine how much tax is included.