Track billable hours and invoice them

The problem

If you sell time, the month ends with an archaeology exercise. You open the calendar, try to remember what Tuesday afternoon was about, and produce a number that feels roughly right. It is almost always low, because the twenty minutes here and the phone call there never make it in, and nobody rounds up in their own favour when they are guessing.

The second, larger problem is invisible. Without recorded hours you cannot tell which clients and which project types actually make money. The retainer that feels comfortable might be the one quietly consuming your week, and the project you priced confidently might be the one you lose money on every time. You will keep repeating both, because nothing in your accounts distinguishes them.

What AI can actually do here

Be clear that this is measurement, not intelligence. The value comes from recording accurately at the moment work happens, and everything after that is arithmetic.

A tracker puts a timer where the work is: in the browser, in the desktop app, inside the project tool you already use. Entries are tagged to a client and a project, so the record builds itself during the week rather than being reconstructed after it. Billable rates turn those hours into money, and project estimates warn you as you approach the budget you quoted, which is the moment the information is still useful.

The layer that changes decisions is profitability reporting: actual hours against what you charged, per client and per project type. That comparison is what tells you to reprice, rescope or decline.

Invoicing joins the two ends. Where tracking and billing sit in the same tool, tracked hours and expenses become an invoice directly, which removes the retyping step and the mistakes that come with it.

How the tools differ

Toggl Track is the tracker. Free forever for a limited number of users, with tracking on web, desktop and mobile and more than 100 integrations through its browser extension. Starter at $9 per license per month adds billable rates and project estimates with alerts, and Premium at $14 per license per month for the first year on annual billing, renewing at $18, adds profitability analysis, fixed-fee projects and timesheet approvals.

Harvest tracks and then bills. Free for 1 seat and 2 projects, Teams at $9 per seat per month adds team reporting and accounting integrations with QuickBooks, Xero and Stripe, and Enterprise at $14 per seat per month adds profitability reporting by client, project, task or team, plus timesheet approval and SSO.

If you already have invoicing you like, take the tracker. If invoicing is also a monthly chore, take the one that does both. Toggl Track vs Harvest covers it directly.

When you don't need a tool

If you work on fixed-price projects, deliver them well, and are happy with the margin, tracking every hour will tell you something you may not act on. It is still worth doing once, for a month, as a measurement exercise rather than a permanent habit.

If you are one person with two clients on retainer, a note in your calendar is enough. The tooling earns its keep when several people work on the same client and someone has to assemble the total.

And if your problem is that clients pay late rather than that you bill wrongly, this is the wrong category. See chase unpaid invoices automatically instead.