Agencies run on two kinds of money: the steady retainer that keeps the lights on, and the project work that lifts a good month into a great one. Billing both cleanly, without a spreadsheet sprawl, is what keeps cash flow healthy and clients happy.
Billing retainers without the monthly scramble
A retainer is predictable revenue, so your billing should be just as predictable. Set up a recurring invoice that raises and sends itself on the same day each month, so you never forget and clients always know what to expect. That removes the monthly “did we invoice them yet?” scramble entirely.
A few things to get right on a retainer:
- A clear scope for what the retainer covers, so out-of-scope work is billed separately rather than argued about.
- Consistent timing so the client can plan around it.
- Automatic reminders so a late payment does not quietly become a cash-flow problem.
Billing projects: quote first, invoice in stages
Project work is lumpier, so structure it:
- Start with a quote or estimate. Win the work with a clear, itemized proposal, then convert the approved quote into an invoice in one click when it is time to bill.
- Bill in milestones. For larger projects, invoice a deposit up front and further amounts as milestones are hit, so you are not carrying the whole cost until the end.
- Add billable expenses. Stock photos, ad spend, or contractor costs can be logged and billed straight back to the client on the invoice.
Keep the whole money side in one place
When you are running retainers and projects across several clients, the risk is losing track of who owes what. One dashboard that shows every outstanding invoice and overdue client means nothing slips between jobs, and pulling a profit and loss or an outstanding-balances report at month end takes seconds, not an afternoon.
The tools that make it painless
Billbooks handles recurring retainer invoices, quotes that convert to invoices, milestone billing, billable expenses, and reminders, all in one place. See invoicing for agencies for the full picture.
If you are choosing a tool, it helps to compare on price and included features rather than the headline number. Our comparison hub lays out how Billbooks stacks up against the main options, and the best invoicing software for freelancers and small teams breakdowns are a good starting point.
The short version
- Retainers: recurring invoices on a fixed schedule, with reminders.
- Projects: quote first, bill a deposit, then invoice by milestone.
- Expenses: log them and bill them back.
- Everything in one view so cash flow never surprises you.
Get that rhythm going and the money side of running an agency stops being the thing that keeps you up at night.
