Create a professional retainer invoice in minutes.
Use this free retainer invoice template for monthly retainers, ongoing support agreements, advisory contracts, and priority availability arrangements. Fill in your details and save as a PDF.
A retainer invoice should clearly state the retainer period, what is covered, and any additional work beyond the retainer scope. This avoids scope disputes and keeps the client relationship smooth.
Your business name, email, and address
Client name, billing contact, and client address
Invoice number, issue date, due date
Retainer description and period covered
Line items for retainer fee and any additional hours or services
Payment terms (often due on receipt or by the 1st of the month)
Bank transfer, Wise, or other payment details
Retainer invoice examples
Monthly support: "Monthly support retainer, June 2026"
Advisory: "Quarterly advisory retainer, Q2 2026"
Development: "Monthly development hours (40h included), additional hours billed at $120/hr"
Retainer payment terms
Most retainer invoices are due on receipt or by the first of the month. Some agreements require 50% upfront and 50% at month-end. Include the retainer period dates on the invoice.
Retainer vs project-based billing
Retainer billing provides predictable income and reduces time spent on proposals and negotiations. It works best when you have an ongoing relationship with a client who needs regular access to your skills. Project-based billing is better for one-off deliverables with a clear start and end.
Many service providers use both models simultaneously: retainers for long-term clients and project fees for new or occasional work. The key is to clearly define what the retainer covers in your agreement so there is no confusion about scope.
Structuring a retainer agreement
A solid retainer agreement should include:
The monthly retainer fee and payment due date
Number of hours or deliverables included
What happens to unused hours (rollover, expire, or convert)
Overage rate for work beyond the retainer scope
Notice period for termination or changes
Reference the agreement terms on each retainer invoice. This keeps expectations aligned and makes renewal conversations easier.
What is the difference between a retainer and a project invoice?
A retainer covers recurring work over a period (usually monthly). A project invoice covers a one-time deliverable. Retainers are typically billed in advance; project invoices are billed after delivery.
Should I include unused hours on a retainer invoice?
It depends on your agreement. Some retainers are use-it-or-lose-it. Others roll over unused hours. State the policy clearly in your contract and reference it on the invoice.
Can I add extra charges to a retainer invoice?
Yes. Add line items for work that exceeds the retainer scope. Clearly label them as overage or additional services.
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