Professional Invoices & Proposals for Marketing Agencies

Agency invoices should be detailed enough to show value but clear enough to avoid confusion. Group line items by service area — social media, paid advertising, content, reporting — with individual costs for each.

For retainer clients, include a brief scope summary on each monthly invoice so the client can see what was delivered. For project-based work, tie invoices to agreed milestones or deliverables.

OwnedWork makes complex agency invoicing simple. Add as many line items as you need, generate professional PDFs, and track payments across all clients. For more detail, see our invoicing guide.

Retainer scope is the number one source of agency-client friction. Define exactly what is included each month — number of posts, ad spend management, reports, meetings — and what falls outside the retainer.

Use OwnedWork's proposal templates to document the retainer scope at the start of the engagement. Reference this scope on each monthly invoice so both parties stay aligned.

Tip: Include an overage clause in your proposals. If the client needs work beyond the retainer scope, bill it at your standard hourly rate. This protects your margins without creating conflict.

Winning a retainer requires a proposal that demonstrates strategic thinking, not just a price list. Open with your understanding of the client's objectives, outline your recommended approach, and detail the monthly deliverables.

Break the proposal into phases if the engagement has an onboarding period — many agencies charge a setup fee for the first month covering audits, strategy, and account configuration.

• Lead with strategy and objectives, not tactics
• Define monthly deliverables clearly
• Include setup or onboarding costs separately
• Specify reporting cadence and meeting schedule