Follow these clear-cut steps to draft a proficient invoice email:
Subject Line: Opt for clarity with "Invoice #[Number] – Due [Date]" for instant awareness.
Greetings: Start off with "Dear [Name],"
Initial Statement: Concisely mention the reason for your email: "Please find your Invoice #12345 for the provided services/products attached. This showcases all the required information."
Invoice Specifics: Include the invoice number, date, deadline, amount due, a concise overview, and payment terms. These components are critical for an exhaustive email invoice message.
Payment Options: Be explicit about accepted payment methods, such as: "Payments may be made via bank transfer or credit card."
Attachment: Attach the invoice as a PDF, correctly named.
Conclusion: Extend a polite offer for assistance, like: "Thank you for your attention. Please reach out for any queries."
Signature: End with your name, position, and contact details.

Tip
Keep it succinct and comprehensive to expedite payments, as a well-composed invoice email can achieve.
This framework is broadly applicable within the UK, but adjustments might be necessary for unique client agreements or industry norms.