Checklist
The pages people skip, then argue about.
Use this before you paste your outline into a document. If a line is empty, the outline is not finished.
Name the work, not the vibe
'Help with marketing' is not a deliverable. A homepage, a fixed set of pages, a monthly report, or a product SKU is a deliverable. If the work can grow without a new price, write the rule for a change.
Price and the moment it is due
Say the amount, the currency, and whether tax is extra. Say what 'paid' means: a deposit, a milestone, or payment on delivery. For a shop, the human terms and the checkout are different systems. The checkout, the receipt, and the inventory belong in OpenSign.
How it ends
Date, cancellation, and what is owed for work already done. A project with no end becomes a retainer nobody agreed to. If you want that retainer designed on purpose, that is a BrandMatchGrowth conversation, not a sentence at the bottom of an invoice.