Retainer Invoice Template
A retainer invoice bills a client for an advance payment that secures your availability over a set period. The retainer is typically held as a credit and drawn down as work is delivered, or it may be a flat fee for guaranteed access. Retainers are common with lawyers, agencies, consultants, and maintenance providers.
When to use this
- When a client pays in advance to reserve your time each month
- When starting a long engagement where you need commitment up front
- When offering priority access or guaranteed response times for a flat fee
- When the retainer acts as a deposit drawn down against future invoices
- When a new client engagement begins and you want payment terms settled first
Key fields to include
- Retainer period covered (for example, October retainer)
- Retainer amount and what it includes or credits against
- Terms for unused hours: roll over, expire, or refund
- Client and provider details with contract reference
- Payment due date for the retainer
- Instructions for how future work will be billed against the retainer
Frequently asked questions
Is a retainer refundable if no work is done?
That depends on your agreement. Some retainers are non-refundable fees for reserved availability; others are refundable deposits credited against work. The treatment must be spelled out in the contract and reflected on the invoice.
How do I invoice against a retainer?
Issue your normal invoice for the work performed and show the retainer credit applied, reducing the amount due. This keeps the running balance visible to the client and avoids double billing.
Should a retainer invoice mention services in detail?
Yes — describe what the retainer covers (hours, scope, period) and what happens to unused time. Clear terms at the invoicing stage prevent most retainer disputes later.
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