The basic requirements for an invoice are:
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Seller's details: Name, address and, where applicable, VAT number and EORI number.
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Buyer's details: Name and address.
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Invoice number: A unique and sequential number.
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Invoice date.
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Clear description of the goods or services.
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HS code/commodity code: For each invoice line item.
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Quantity and unit price.
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Total amount payable.
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Currency.