What is a Timesheet?

Types of Timesheets

Timesheets come in several formats depending on use case:

• Daily timesheet — hours logged per day per task; highest granularity, best for billing accuracy
• Weekly timesheet — total hours per project per week; lower admin burden, common for salaried teams
• Project timesheet — total hours per project accumulated over its duration; used for profitability analysis
• Employee timesheet — hours per person per period; used for payroll and utilization tracking
• Automatic timesheet — generated from timer data when team members start/stop timers on tasks

What Timesheets Actually Tell You

Raw timesheet data becomes insight when you analyze it:

Timesheet Best Practices

The most common timesheet failure: logging hours at the end of the week from memory. Memory is inaccurate — people underestimate time on frustrating tasks and overestimate time on work they enjoyed.

Best practice: log hours at the end of each day, or use a timer to capture them in real time. Real-time timers are the most accurate method — you start a timer when you begin a task and stop it when you finish.

For agencies: establish a timesheet policy with a clear submission deadline (Friday by 5pm), and make it part of the team culture early. Once timesheets become a habit, the data they produce is invaluable. When they're treated as optional, the data is worthless.

Timesheet Approval Process for Teams

Timesheet data is only reliable if it goes through an approval process before it's used for billing or reporting. Without approval, errors — wrong project codes, missing entries — get baked into your invoices and reports.

The standard approval workflow has three roles: the submitter (team member who logged the hours), the reviewer (project manager or team lead), and the approver (someone with authority to confirm the hours for billing).

For most teams of 4-25 people, a lightweight two-step process works: team members submit timesheets by Friday EOD, managers review and approve by Monday morning. Any corrections get resolved before the billing cycle runs.

Common things to check during approval: Are all project codes correct? Are the hours reasonable given the tasks described? Is any time missing for days the person was supposed to be working? Are there entries without task descriptions?

For agencies billing hourly, timesheet approval is a financial control — unapproved hours should never appear on an invoice.

• Submitter logs hours by Friday EOD with project codes and task descriptions
• Reviewer checks for incorrect codes, missing entries, and unusual hour totals
• Approver signs off before hours go to billing or reporting
• Keep the window short: submit Friday, approve Monday, invoice Tuesday
• Treat unapproved timesheets as not yet valid for any downstream use

Timesheet Data for Invoicing

For hourly billing, the connection between timesheets and invoices is direct: approved hours multiplied by rate equals the invoice amount. But most agencies use timesheets to check whether fixed-price projects are profitable and to support cost-plus or milestone billing.

Before generating an invoice from timesheet data, answer four questions: Are all hours approved and attributed to the correct project and client? Are any hours billable that weren't marked as such? Are all third-party costs captured? Does the total match the project budget?

For recurring retainer clients, timesheets tell you whether you're over-delivering (spending more hours than the retainer covers) or under-delivering. Both are problems. Retainer analysis by comparing timesheet hours to retainer value is a monthly task for most agency account managers.

Digital Timesheets vs Manual Logging

The choice between digital timesheets and manual logging is not a close contest — digital wins on every metric.

Manual logging means spreadsheets, paper, or email-based time reporting. Problems: data entry errors, end-of-week reconstruction from memory, no real-time visibility for managers, and painful aggregation. For any team billing clients on time, manual logging creates billing errors that cost real money.

Digital timesheets that integrate with a time tracker solve most of these problems. When a team member starts a timer on a task and stops it when done, the time entry is automatic, accurate, and tied to the right project without additional data entry.

For teams using a project management tool with built-in time tracking, the timesheet is essentially a report view of all timer data. Hours flow from task timers to work reports to invoices automatically. That integration is worth more than any individual feature of a standalone timesheet tool.

• Manual timesheets: error-prone, memory-based, no real-time visibility
• Digital timesheets: accurate, immediate, project-attributed, reportable
• Timer-based logging is more accurate than end-of-day or end-of-week recall
• The best setup: timer data flows directly into timesheet and then into invoices