How to Track Billable Time by Client and Project in an Agency

Agency time tracking usually fails in small ways before it fails in the accounts. A designer forgets two hours. A strategist logs work against the wrong client. A project manager marks rework as billable because nobody agreed the rule.

By invoice day, the timesheet looks complete enough, but the numbers do not match delivery reality. That is where agencies lose margin, over-service retainers and send invoices that clients question.

The fix is not just buying time-tracking software. The tool only works if the agency uses a clean operating structure: client, project, task or service, then time entry.

This guide shows that structure in practical terms. Set up the hierarchy, assign rates before work starts, track daily, review weekly, approve time, then invoice or report from approved data.

What hierarchy should an agency use for billable time?

Use one hierarchy across the agency: client → project → task or service → time entry. This sounds basic, but it prevents most reporting problems before they reach finance.

The client layer is for reporting and invoicing. If Acme Dental has three active scopes, those scopes should still roll up to Acme Dental for account-level profitability.

The project layer is where the commercial promise lives. It might be an SEO retainer, a website build, a paid media sprint or a discovery phase. Each project should have its own budget, retainer bucket or estimate.

The task or service layer explains what the work was. For an SEO retainer, useful categories might be content, technical SEO, reporting and meetings. Keep categories broad enough that people use them, but specific enough to show where time goes.

The time entry is the actual work log. It should say who did the work, how long it took, whether it was billable and what should appear in a client-facing note.

Separate internal projects from client work. Admin, sales, training, hiring, internal meetings and rework should not sit inside client projects unless they are genuinely part of the paid scope.

This separation makes utilisation harder to ignore. The limitation is discipline: the team needs somewhere obvious to put internal time, or they will hide it inside client delivery.

What fields should every billable time entry capture?

Every billable time entry should capture enough information to survive invoice review without a Slack archaeology session. If a manager cannot understand the entry a week later, the client will not understand it either.

At minimum, capture the client name, project name, task or service category, team member, billable status, rate source, budget or retainer bucket, short work note, approval status and invoice or export status.

The billable flag is the field agencies should treat as non-negotiable. A time entry without a clear billable or non-billable status is not neutral; it is unreliable data.

The rate source matters because rates often vary by project, person or task. Harvest supports project, person and task billable rates, while Toggl Track supports workspace, member and project rates on Starter, with project-member rates on Premium.

Do not make the team write essays in the notes field. A useful note is short and client-safe, such as “drafted homepage copy section” or “QA fixes after staging review”.

The downside of adding fields is friction. If the form becomes a chore, people delay tracking and guess later. Start with the minimum fields that support billing, then add detail only where it changes a decision.

Which billing model should you choose before tracking starts?

Choose the billing model before delivery starts, because it decides how time should be used later. Reconstructing rates and rules at invoice time is slow and usually wrong.

For time and materials work, every approved billable hour can flow into the invoice. This is the cleanest model for time tracking, but it depends on accurate daily logging and manager approval before billing.

For fixed-fee projects, time still matters even if the invoice amount does not change. It shows budget burn, delivery margin and whether the next estimate should be higher.

For retainers, track time against the monthly bucket and review over-servicing before it becomes normal. A client using 45 hours on a 30-hour retainer may be profitable once, but it becomes a margin problem if nobody sees the pattern.

For internal work, track it separately and accept that it will not appear on a client invoice. The value is operational: it shows how much capacity is being lost to admin, rework, sales support and unclear scope.

Rates should be assigned before people begin work. Toggl Track can keep historical billable-rate records with start and end dates, which helps when rates change mid-year. The catch is that more detailed rate handling may require a paid plan.

What weekly time review process works in an agency?

Review time every week, before invoices and client reports are prepared. Monthly cleanup is too late because memories fade and bad habits spread.

The simplest rhythm is daily tracking with a Friday review. Ask the team to log time in real time where possible, or at least by the end of each day.

On Friday, check for missing days, uncategorised entries, strange durations, wrong projects and entries with no billable status. This is quality control, not theatre.

Managers should approve billable time before it reaches finance or the client. Approval protects the invoice from obvious disputes, but it can become a bottleneck if only one person can clear every entry.

After approval, export the time, generate reports or create invoices depending on the tool. Harvest can create invoices from tracked time, expenses and fixed fees, while Teamwork can add invoicing from logged time on higher plans.

Compare actual hours against estimates, retainers or fixed-fee budgets in the same weekly review. The point is to catch scope creep while there is still time to change behaviour.

Review non-billable leakage without turning it into employee surveillance. The useful question is why the work happened, not who can be blamed for logging it.

Which tool fits each billable-time setup?

Toggl Track fits agencies that want fast adoption, lightweight timers and clean reporting without replacing their project management system. It ranks seventh overall in the AgencySoftware index and is our highest-ranked dedicated time-tracking tool.

Its Free plan is available for teams of up to 3 users, which helps tiny teams test the habit. The limitation is important: billable rates start on Starter, not the Free plan.

Toggl Track Starter adds billable rates, tags, milestones and team reports. Premium adds profitability reports, fixed-fee projects, project dashboards and timesheet approvals, which makes it a better fit once managers need a formal approval step.

Harvest fits agencies that want tracked time, expenses, invoices and payment collection closer together. It supports time tracking, expense tracking, invoicing, estimates, billable and cost rates, team reporting and integrations.

The trade-off is cost modelling. Harvest Free includes 1 seat and 2 projects, and the Teams plan is listed at $11/seat/month. Current paid-plan help also refers to usage dimensions, and Stripe or PayPal fees apply if clients pay through those providers.

Teamwork fits agencies that want time tracking inside project operations. It is built around client work, so it suits teams that need projects, retainers, workloads and billable time in the same delivery system.

Teamwork Free includes up to 5 users and 5 projects, with time logging and client organisation. Basics includes tracking and reporting billable time, while Accelerate adds time budgets, retainers, workloads and invoices from logged time. The downside is that the stronger agency controls move up the plan ladder.

ClickUp fits agencies already running delivery inside ClickUp. Unlimited adds native time tracking, which is useful when tasks, lists and spaces already hold the work.

Do not treat ClickUp as a native invoicing and payment-collection system. Its pricing table shows Billable Reports & Timesheets on Business and Enterprise, so check the plan before relying on it for client billing.

How much do the main time-tracking setups cost?

Use the recorded starting prices as the first filter, then check the plan features that affect billing. A cheap plan that cannot mark time as billable may cost more in manual cleanup.

Toggl Track is listed on AgencySoftware as Free, then $9. Its public pricing shows Starter at $9/user/month when billed annually and $12/user/month when billed monthly. Starter is where billable rates begin.

Harvest is listed as Free, then $11. Its Free plan includes 1 seat and 2 projects, while Teams is listed at $11/seat/month on monthly billing. Annual billing is also available.

Harvest can reduce the handoff from timesheet to invoice. The catch is that total cost may include seats, usage dimensions and payment provider fees. Harvest says Stripe and PayPal apply their own fees to online payments.

Teamwork is listed as Free, then $10.99. The Free plan can work for a very small team, but billable reporting, time budgets, retainers, invoicing and profitability features become plan-selection questions.

ClickUp is listed as Free, then $7. Its public pricing shows Unlimited at $7/user/month when billed annually and $10/user/month when billed monthly, with native time tracking on Unlimited.

For agencies buying ClickUp for billable reporting, the $7 plan is not the whole answer. Billable Reports & Timesheets appear on Business and Enterprise, so the useful plan may sit higher than the entry paid tier.

How do you stop non-billable work distorting profitability?

Create non-billable categories on purpose, instead of letting them pollute client projects. The common buckets are admin, internal meetings, sales support, training, rework and out-of-scope client requests.

Rework deserves special treatment. Some rework is normal quality control, but repeated rework against one client, one service or one team process points to a delivery problem.

Meetings need the same honesty. A client strategy call may be billable under the scope, while an internal handover meeting may not be. If the rule is not written down, the team will guess.

Retainers are where leakage hides fastest. A few extra calls, small edits and “quick” requests can turn a profitable monthly account into unpaid work.

Use non-billable reporting to improve the operating system, not to punish accurate logging. If people think non-billable time will be used against them, they will stop recording it correctly.

The best agencies make the rule practical: track the truth first, then decide what to change. That may mean clearer scopes, better client boundaries or a higher retainer price.

Implementation checklist: set this up before the next invoice

Start with naming conventions. Use one client name everywhere, then create one project per engagement, retainer or major scope.

Define service categories before launch. For a digital agency, categories might include strategy, design, development, content, QA, reporting and meetings. Avoid twenty near-duplicate labels.

Create internal projects before asking the team to track time. If internal work has no home, it will end up inside client delivery.

Assign billable rates and cost rates where the tool supports them. Harvest supports billable and cost rates for teams, while Toggl Track adds more profitability tools on Premium.

Set default billable rules by project or task where possible. The limitation is that defaults still need review, because scope exceptions happen.

Train the team on what counts as billable. Give examples from real work, such as client-requested revisions, internal QA, account management and proposal support.

Schedule a weekly approval window and protect it. If time is not reviewed until invoice week, the process becomes cleanup instead of management.

Lock or approve time before invoicing where the tool supports it. Toggl Track Premium includes timesheet approvals, and approval workflows reduce invoice disputes when used consistently.

Review budget versus actuals monthly. Weekly review catches errors; monthly review shows whether the pricing model still works.

What should you do next?

Accurate agency time tracking is an operating process first and a software decision second. The tool makes the process easier, but it will not fix unclear scopes or inconsistent billing rules.

Start with the simplest structure the team will use every day. For a small agency with a separate project management tool, Toggl Track is often the cleaner time system. For agencies that invoice directly from time and expenses, Harvest keeps the handoff shorter.

If time tracking needs to sit inside delivery operations, Teamwork is the better fit for client projects, retainers and workloads. If the agency already runs work in ClickUp, use ClickUp time tracking, but confirm the billable reporting plan before relying on it for invoices.

Many agencies end up with a hybrid: project management for delivery, plus a dedicated time tracker for billable reporting. That is fine if the handoff is clear and one system remains the source of truth for approved hours.