How to Manage Monthly Retainers for Agency Clients
Manage monthly retainers well: define the scope, bill in advance, handle extra work and unused hours, review renewals and track the margin. Worked example.
Quick answer
Monthly retainers are a fixed monthly fee for an agreed set of services or hours. Manage them well by defining deliverables precisely, billing in advance, tracking time against the agreed allocation, quoting extras separately, and reviewing profitability before each renewal.
Types of retainers
| Type | Example | Best for |
|---|---|---|
| Deliverable-based | 12 social posts, 4 reels and a monthly report | Clients, who find it easy to understand |
| Hours-based | 40 hours of design time a month | Agencies, who find it easier to protect |
| Access-based | Priority access to senior advice, with a cap on hours | Consulting and strategy work |
Define the scope
Write down:
- Deliverables or hours per month.
- What is out of scope: ad spend, photography, influencer fees.
- Turnaround times and the number of revisions.
- Whether unused hours roll over.
- Notice period and minimum term, for example 3 months.
Billing
Bill on the 1st of each month, in advance, with 7-day payment terms. Raise a separate invoice for extras so the retainer invoice stays predictable and easy for the client to approve. Setting it up as a recurring invoice saves you doing it by hand every month.
Worked example
A Kolkata marketing agency has an ₹80,000 a month retainer with a client in West Bengal, for 40 hours of work.
| Amount | |
|---|---|
| Effective rate | ₹2,000 an hour |
| Monthly invoice: ₹80,000 + CGST ₹7,200 + SGST ₹7,200 | ₹94,400 |
| Extra 8 hours in March for a launch, at ₹2,200 an hour | ₹17,600 + GST, separate invoice |
| Team cost for 40 hours | ₹48,000 |
| Tools and overheads allocated | ₹10,000 |
| Monthly margin on the base retainer | ₹22,000 (27.5%) |
Unused hours
Pick one policy and write it into the agreement:
- Unused hours expire each month (the simplest).
- Unused hours roll over for one month only.
- Unused hours can be swapped for a defined deliverable.
Open-ended rollover builds a backlog of work that you end up delivering later at no extra charge.
Renewal reviews
Every quarter, compare hours used, extras billed and margin. If the client consistently uses 50 hours on a 40-hour retainer, propose a new tier rather than absorbing the extra. Our guide to project profitability shows how to work out the cost per hour behind these numbers.
Common mistakes
- Undefined “ongoing support”.
- Unlimited rollover of unused hours.
- Billing in arrears with long payment terms.
- Not tracking time, so you cannot see the problem until the margin has gone.
Frequently asked questions
Should retainers include ad spend?
What notice period is fair?
Should I charge GST on a retainer billed in advance?
How do I raise a retainer fee?
Next step
List your current retainers with their hours, extras and margin for the last three months. PikZiy Books bills retainers automatically on the 1st, keeps extras on separate invoices and shows the margin on each client.
