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VAT calculation formula
To calculate Net price (exclusive VAT) from Gross price (inclusive VAT) you should divide the gross amount by 1 + VAT percentage.
For example if VAT is 23% (standard Ireland VAT rate) , then you should divide by 1.23.
Then subtract the gross amount, multiply by -1 and round to the closest value.
You can find out the gross value simply multiply the net amount by 1 + VAT rate.
For example if VAT rate 23% - multiply by 1.23 and you'll get the gross amount.
In order to get the value of VAT, simply multiply the net amount by the percentage of VAT.
The standard UK VAT rate is 20%. Reduced rate is 5%. If you’re not sure which VAT rate is in your country read more about VAT rates on Wikipedia.