- Job number and proof approval date
- Every print job has an approved proof. Quoting the job number and approval date links the invoice to what the client signed off, which resolves most disputes over colour and content.
- Finished size and pages
- State finished size such as A4 or 23x36 and the number of pages or panels. Printing prices change sharply with size and page count, so the invoice should show what drove the price.
- Paper or board specification
- Mention the stock, such as 130 GSM art paper or 300 GSM duplex board. The buyer can check that the specified material was used, and it supports the classification of cartons versus leaflets.
- Colours and finish
- Record four-colour, two-colour or single colour, plus lamination, UV or foiling. Finishing is often a separate cost and should be visible on the bill.
- Paper supplied by
- Say whether paper was the press's own or supplied by the customer. If the customer owns the paper, the press is usually providing a printing service on the customer's goods, not selling printed matter.
- Delivery quantity and overs
- Printing runs often produce overs or unders. Show ordered and delivered quantity so the buyer pays for what was actually received.