The best invoice format is the one the buyer can process and you can retain as an accurate issued record. A PDF is often convenient, but a customer portal or structured invoicing requirement can change the answer. Ask about the delivery route before choosing the file.
This article focuses on file format and handover. The field template and VAT guide cover the information that belongs inside it.
Separate the working file from the issued copy
| Format | Useful job | Check before relying on it |
|---|---|---|
| Editable document | Preparing and updating a draft | Remove comments, tracked changes and old customer details. |
| Spreadsheet | Calculations and a controlled internal template | Check formulas, hidden sheets, print range and exported layout. |
| Text-based PDF | A stable viewable copy for common email workflows | Open the exported file; check readable/selectable text and all pages. |
| Portal or structured format | A buyer’s specified procurement process | Confirm schema, upload fields, references and acceptance status. |
A PDF can be edited. Its value is a consistent presentation and a saved issued version, not a guarantee against alteration. Preserve the original file and delivery record under suitable access controls.
Keep a PDF readable
Use real text rather than a screenshot of the whole invoice. Keep headings clear, use a sensible reading order and make totals and currency explicit. Avoid faint grey type and relying on colour alone to distinguish a balance. A recipient may enlarge the page or use assistive technology.
A text-based PDF is not automatically fully accessible. Check the export settings and any accessibility requirements the buyer specifies. If the buyer needs another suitable format, discuss it rather than assuming that a visually tidy PDF solves every access need.
A fictional delivery decision
A designer bills Northbank Workshop £480. Its finance team accepts emailed PDFs, requires purchase order PO-218 and wants the reference in the subject. The designer saves the editable source, exports CD-2026-018_Northbank.pdf, checks it, then sends it to the confirmed accounts address with subject “Invoice CD-2026-018 — PO-218”.
Another customer requires a portal. The same designer enters the required references there and retains the submission confirmation. Sending the PDF by email as well does not necessarily complete that customer’s process or create another invoice.
Check a spreadsheet before sharing it
- Are there hidden worksheets or old customers in the file?
- Do totals use the intended cells after inserting a row?
- Is the print area complete?
- Does the recipient need formulas, or only the issued bill?
- Can an exported PDF preserve the necessary information without sharing your whole workbook?
Keep the underlying calculations privately where they belong. Do not include sensitive customer lists merely because they share a workbook with the invoice tab.
A final-file check
- Open the saved file outside the editing session.
- Confirm all pages, amounts, dates and references.
- Verify payment instructions against trusted records.
- Check that the buyer can access a shared link without an unintended public permission.
- Retain the issued version and delivery confirmation.
Use GOV.UK’s field requirements for the UK content check. For a required e-invoice, read the buyer’s and relevant authority’s format rules: a PDF attachment and structured invoice data are different things. Our PDF, portal and e-invoice comparison explains that distinction.
The Talentra generator offers a browser print route for a simple invoice. It does not submit to procurement portals or certify a PDF against a specialist accessibility or e-invoice standard.
Published by Talentra Solutions. Revised 19 October 2026 with a practical workflow and clearer limits. Examples are fictional. Report a correction.