Excluding the right most 2 numbers, list the numbers vertically and multiply each by a value starting with 8 and ending with 2. Then add up all the sums you have and deduct 97 from the sum until the answer is negative. The negative sum should be equal to the last 2 digits of the VAT Number if the VAT Number is valid.

For an example if the VAT Number of a company is "GB 339072747" we can validate it as follows.

• Take the numeric part of the VAT NUmber. (339072747)

• Omit last 2 right most digits and take the rest. (3390727)

• Write them in vertical side as follows.

    3
    3
    9
    0
    7
    2
    7

• Then miltiply each digit with 8 to 2 starting from top as follows.

    3 x 8 = 24
    3 x 7 = 21
    9 x 6 = 54
    0 x 5 = 00
    7 x 4 = 28
    2 x 3 = 06
    7 x 2 = 14

• Calculate the Total.

    Total = 24 + 21 + 54 + 00 + 28 + 06 + 14 = 147

• Deduct 97 from the Total until the figure gets negative

    147 - 97 = 50
    50 - 97 = -47

• If this negative number is same as the last 2 right most digits then the VAT Number is valid. 

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written by CORINECARDENAS , August 07, 2010

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