Bill what the work really cost, or see what your fixed price was worth.
Project profitability tracking for work with AI agents: value of work, revenue, costs and contribution margin per project and client. On time and materials, the effort goes onto the e-invoice in full. On a fixed price, you see the effective hourly rate.
- 30 days of Pro
- No credit card
- Then continue on Free
Time and materials or fixed price
Time and materials
Working time, AI work and your own items go onto the e-invoice in full and traceably. The invoice assistant finds what is done but not yet billed.
Fixed price
Value of work by progress and the effective hourly rate per project, so your next price fits better. Bill in parts: a percentage, an amount or the rest.
AI costs as an expense
Where you work at API prices, pass AI costs on at cost or with a markup, or bill by token volume or active runtime.
Project profitability tracking with every cost
Value of work is what the work is worth: billable hours times the hourly rate on time and materials, the fixed price spread by progress on a fixed price.
Revenue is what you invoiced, counted by invoice date. Costs are AI costs at API prices or as a share of your subscriptions, agent runtime and working time at your own cost rates, and expenses. You decide per project which of them count.
Contribution margin is revenue minus costs, per project, per client and as a monthly trend. If a model has no price yet, the costs show as a lower bound.
The effective hourly rate on a fixed price
Fixed price divided by the hours worked, shown on the project page next to value of work, revenue and costs. A fixed price of 6,000 euros at 40 hours makes 150 euros per hour; if the project took 60 hours, it was 100 euros.
With estimated hours on the order, the value of work grows with progress: hours worked divided by hours estimated, never above the fixed price. So you see during the project whether the price holds. Without an estimate, the fixed price is spread over the hours worked so far.
Client profitability over time
Your agent knows your margins too
- How profitable was last quarter?
tm revenue --from 2026-07-01 --to 2026-09-30 - What did the project cost this month?
tm projects costs <project-id> --range month - Add the Figma license to the project
tm expenses create --project-id <project-id> --title "Figma license" --amount-net 49.90 - Bill September, AI costs plus 20 %
tm invoices build --customer-id <client-id> --month 2026-09 --ai-mode cost --ai-markup-bp 2000
Agent access is part of Pro.
Fixed price vs. time and materials
Which billing model pays off when AI agents do part of the work.
Read guideEffective hourly rate calculator
Enter your fee, hours and AI costs, and compare the result with your target rate.
Open toolAI agency pricing
Fixed price, retainer, time and materials plus AI costs or value-based: how AI agencies bill.
Read guide
Free and Pro
Profitability, invoices and passing on AI costs are part of Pro.
Try Pro for 30 days, no credit card. Afterwards you continue on Free automatically, with nothing locked and no data lost.
Try Pro for 30 days| Feature | Free€0foreverCapture and understand | Pro€15per user and month or €150 a year, 2 months freeBill, cost, disclose, automate |
|---|---|---|
| Unlimited time tracking | ||
| Full AI capture | ||
| AI reporting | last 30 days | full history |
| Commits | ||
| CSV export | ||
| Profitability and orders | – | |
| E-invoices and payments | – | |
| Timesheets for clients | – | |
| Agent access | – | |
| Create account | Try Pro for 30 days |
Frequently asked questions
Fixed price vs time and materials: which does Time Momentum support?
Both, plus pro bono. Each project has a billing type. Time and materials values the working time at an hourly rate and bills the effort; a fixed price bills the agreed price, and the working time becomes the basis for costing it afterwards.
Can I pass AI costs on to my client?
Yes. On the invoice, AI work can be billed at cost, with a markup, by token volume or by active runtime, grouped per project, per model or as a single item.
Does Time Momentum replace my accounting software?
No. It covers orders, e-invoices, payments and profitability. Receipts, tax returns and banking stay in your accounting software.
Know what your projects earn
- 30 days of Pro
- No credit card
- Then continue on Free