Invoicing Agent Work
Agent time and LLM expenses appear on invoices alongside human work. This page explains how to present agent work to clients clearly and professionally.
How Agent Work Appears on Invoices
When creating an invoice from tracked time and expenses:
- Agent time entries are included like any other time entry. They show the agent’s name, hours, rate, and project/task.
- LLM expenses appear as a line item under the “LLM Usage” category with quantity, unit price, and total.
Example Invoice Line Items
| Description | Hours/Units | Rate | Amount |
|---|---|---|---|
| Sarah Chen — Backend development | 12.0 hrs | £150/hr | £1,800 |
| review-bot-01 — Code review (Agent) | 6.0 hrs | £75/hr | £450 |
| LLM Usage — claude-opus-4-6 tokens | 180k tokens | £0.003/k | £0.54 |
Grouping Options
When creating invoices, you can group line items by:
- Project — all human and agent work under one project heading
- Team member — agent users appear as separate line items
- Task — human and agent contributions to the same task grouped together
Setting Agent Rates
Agent users have their own billable rates, set in Managing Agent Users. Common approaches:
- Discounted rate — agents billed at a lower rate than humans (e.g., £75/hr vs £150/hr)
- Cost-plus — LLM costs passed through plus a margin
- Blended rate — one rate that covers both human oversight and agent execution
Tips
- Include a brief note on invoices explaining what agent work is. Many clients are seeing this for the first time.
- Use the notes field on agent time entries to describe what was done in plain language.
- Consider a separate line item for LLM costs so clients can see the infrastructure cost vs. the service cost.