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To check that a UK VAT number is valid you should first check that it is 9 digits long. (This does not include the GB which is sometimes stated at the beginning). The first 7 digits are random numbers and the last 2 digits are based on a formula using the first 7 numbers.
Please note that this test may not work for new VAT registration numbers. As an alternative to the VAT number checker test below you can use the EU VAT Checker website which can be used to check all VAT numbers within the EU.
To check that the VAT number 314 1592 83 is valid we will follow the steps above.