CHECK VAT NUMBER TO MAKE SURE IT'S VALID

VAT registration is not valid if the VAT number is not correct!

It is possible to check whether a VAT registration number shown on an invoice is valid. This is important because the purchaser cannot recover VAT incorrectly charged by an unregistered trader unless Customs & Excise allow them to do so by concession. Therefore, registration numbers should be tested as follows:

1. The first seven digits of the VAT registration number are listed vertically.
2. Each digit is multiplied by a number, starting with 8 and decreasing to 2.
3. The sum of the multiplications is calculated.
4. 97 is subtracted from the sum as many times as is necessary to arrive at a negative number.
5. The negative number should be the same as the last 2 digits of the VAT registration number if it is valid.

Example

VAT registration number 339 0727 47

Total = 147

147 - 97 = 50 - 97 = - 47

As the negative number(- 47) is the same as the last two digits of the VAT number, the number is valid.

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