A retainer invoice does two jobs. It collects next month's fee, and it reminds the client what last month's fee bought. The second job matters more than freelancers think. Retainers rarely end because the work was bad; they end because someone in finance asked "what are we getting for this?" and nobody had a ready answer. An invoice that reports usage every month answers that question twelve times a year.
This template bills the retainer in advance, shows usage against the allowance, carries out-of-scope work on separate lines, and states the rollover rule. It suits marketing, design, development, PR, bookkeeping and advisory retainers.
TL;DR
The retainer invoice template bills the coming month's retainer fee in advance, reports last month's hours or deliverables used against the allowance, shows rollover, and adds approved out-of-scope work as separate dated lines, with a [TAX RATE]% placeholder. Send it on the same date every month. The most important section is the usage summary, because retainers that show their value monthly are the ones that renew.
What's inside
- Header and bill-to — your details and the client's billing entity.
- Retainer terms block — monthly fee, allowance, period, rollover rule, overage rate.
- Usage summary — last month's allowance, used, remaining, rolled over.
- Delivered last month — three to eight bullet points of outcomes.
- Out-of-scope items — approved extras billed in arrears.
- Totals and payment terms — tax placeholder, due date before the period starts.
When to use it
Use it for any monthly arrangement where the client pays a fixed amount for reserved capacity or a defined set of deliverables: social media management, SEO, content, design support, website care plans, fractional marketing or operations, bookkeeping.
If you are invoicing a one-off upfront payment against a single project, use a deposit invoice. If the client buys hours ad hoc with no commitment, an hourly invoice is simpler. Define the allowance, notice period and overage rate in a retainer agreement first.
Hours retainers versus deliverables retainers
Hours retainers buy a block of time, such as 20 hours a month. The usage summary is a simple hours table. They suit support work and advisory roles where the tasks change week to week.
Deliverables retainers buy outputs, such as eight blog posts, twelve social posts and one monthly report. The usage summary lists what was delivered against the plan. They suit content and marketing work where the client cares about output, not time.
Many retainers mix both: a set of core deliverables plus a small hours bucket for ad hoc requests. The template handles either. The hourly vs fixed fee vs retainer pricing post explains when each model works.
Rollover and overage
Write down the rollover rule and print it on every invoice. Common options are no rollover, rollover for one month only, or rollover up to a cap such as 25% of the allowance. Unlimited rollover tends to create a backlog of owed hours that lands all at once.
For overage, agree a rate and a threshold that needs approval. A client who approved "up to five extra hours this month" will pay the overage line without question. A client who learns about ten extra hours from the invoice will not.
Customize it in your COLO workspace
In COLO you can track time against retainer tasks, mark them billable or non-billable, and create invoices from tracked time for overage. Invoices support line items, tax rates, discounts and partial payments, and you can email them or download a PDF. Each invoice is sent when you choose to send it. See Invoicing and Payments.
A project budget set to the monthly allowance warns you in-app at 80% and stops billable timers at 100%, offering to request a contract update, continue as non-billable, or pause. Timesheet and invoice reports export to CSV, Excel or PDF if the client wants a usage report attached.
Why this template works
- Advance billing protects your capacity. You are not lending a month of work to the client.
- Usage reporting renews retainers. Every invoice restates the value.
- Out-of-scope work is visible. Extras do not quietly erode the margin.
- Rollover is printed, not remembered. No end-of-quarter arguments about banked hours.
FAQ
Q: Should a retainer be billed in advance or in arrears?
In advance is the norm. The retainer reserves your capacity for the coming month, so the client pays before the month begins. Out-of-scope work from the previous month is billed in arrears on the same invoice.
Q: What should a retainer invoice show besides the fee?
The period covered, the allowance (hours or deliverables), last month's usage against it, any rollover, and out-of-scope items. Usage reporting is what keeps retainers renewing.
Q: How do I handle work beyond the retainer allowance?
Agree an overage rate in the retainer agreement, get approval before you exceed the allowance, and bill overage as a separate dated line on the next invoice.
Q: What date should retainer invoices go out?
Pick one date and keep it, commonly the 25th of the prior month or the 1st of the month covered. Consistency helps the client's finance team schedule the payment.
Q: Can I send retainer invoices automatically?
Some tools can schedule them. Many freelancers prefer to send each one manually because it is a natural moment to report usage and flag next month's priorities.