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The Letter Invoice is a widely used document format in Nigerian business practice that combines the formality of business correspondence with the functional aspects of an invoice. This document type is particularly relevant when businesses need to maintain a more professional and personalized approach to billing while ensuring compliance with Nigerian tax and business regulations. The Letter Invoice should be used when sending formal payment requests to clients, especially in professional services or high-value transactions where a standard invoice might be too impersonal. It must include all elements required by Nigerian law, such as VAT calculations, tax identification numbers, and clear payment terms, while maintaining the professional tone and structure of a business letter. This format is especially effective for building and maintaining professional relationships while ensuring proper documentation of financial transactions.

1. Letterhead Information: Company name, registration number, address, contact details, and tax identification number

2. Date and Reference Number: Current date and unique invoice reference number

3. Recipient Details: Client's name, company name, address, and contact information

4. Subject Line: Clear indication that this is an invoice and brief description of services/goods

5. Opening Statement: Professional greeting and brief context of the invoice

6. Invoice Details: Itemized list of goods/services, quantities, unit prices, and total amounts

7. Payment Summary: Subtotal, applicable taxes (VAT at 7.5%), and final total amount

8. Payment Terms: Due date, accepted payment methods, and bank account details

9. Closing Statement: Professional closing with contact information for queries