As soon as you become VAT registered, you need to make sure that your VAT invoices meet the UK/ EU requirements. The elements which must appear on your invoices are different if your client is in the UK or in another country in the European Union.

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An identifying number, which must be unique and sequential
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A tax point date
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The name and address of the supplier
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The VAT number of the supplier (9 digits grouped 3, 4, 2)
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The name and address of the customer
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A description of the supply
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The total amount payable excluding VAT
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The total amount of VAT chargeable and the rate that applies
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The supplier should prefix GB to the VAT number
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The customer’s registration number if the customer is VAT registered
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The description of each supply should show the net amount in GBP
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If the supply is subject to the reverse charge procedure, a statement explaining that this is the case.)