A timesheet is a record of the hours an employee or contractor worked during a specific period — showing when work started and ended, which tasks or projects the time was spent on, and the total hours logged. Timesheets are used for payroll, client billing, project management, and compliance with working hour regulations.
The name comes from the original paper format — a physical sheet where workers recorded their time in and time out, signed by a supervisor, and submitted to payroll. Today timesheets are more commonly digital: spreadsheets, dedicated time tracking software, or — for teams using Slack — an automatic record generated by time tracking commands without any manual entry at all.
Timesheet definition — what it means
A timesheet is a document — physical or digital — that records how an employee’s working hours were spent over a defined period, typically a day, week, or pay period. At minimum a timesheet records total hours worked. More detailed timesheets record start and end times, task descriptions, project codes, and the distinction between regular and overtime hours.
Timesheets serve four primary functions.
Payroll — the hours on the timesheet determine what an hourly or salaried employee is paid, including overtime calculations.
Client billing — for agencies, consultancies, and freelancers, the timesheet is the source document for invoices. Billable hours logged against a client project become line items on the invoice.
Project management — timesheet data shows how actual hours compare to estimated hours, which projects are over-running, and where the team’s time is going.
Compliance — in many jurisdictions, employers are legally required to maintain accurate records of employee working hours. The EU Working Time Directive, for example, requires member states to ensure accurate daily working time records. Timesheets are the standard documentation.
What a timesheet contains
A complete timesheet typically includes the employee’s name, department, and the pay period it covers. Each entry shows the date, the clock-in and clock-out times or the total hours for that day, and the break time taken. More detailed timesheets add a task or project description for each entry — what the hours were spent on — which is essential in client-billing contexts where the invoice needs line-item detail.
Regular hours and overtime hours are usually tracked separately, since overtime may attract a different pay rate. At the end of the period the timesheet shows a daily total for each day and a grand total for the full period. Most timesheets require approval — a manager or supervisor signs off before payroll processes the hours.
Timesheet examples by industry
What a timesheet looks like in practice varies significantly by industry and purpose.
Agency and creative work
An agency billing clients by the hour needs task-level detail because the timesheet becomes the invoice. Each entry records the client name, the specific task, and the exact hours — distinguishing billable time (client concept development, client calls, client revisions) from non-billable time (internal admin, new business pitching). At the end of the week the timesheet shows total hours per client, from which invoices are generated.
Software development
Engineering timesheets often reference sprint tickets or project identifiers alongside task descriptions. A developer’s week might show time split across feature development, code review, bug fixes, and team meetings — each entry tagged to the relevant ticket so the hours can be attributed to the right project or sprint budget. This level of detail makes it possible to compare estimated vs actual hours at the ticket level.
Professional services — legal and consulting
Law firms and consulting practices typically bill in six-minute increments (one-tenth of an hour), which requires the most granular timesheet format. Every activity is recorded to the nearest increment: 0.3 hours for a client email, 1.2 hours for research, 2.4 hours for drafting. The description is essential because clients may request detailed billing narratives. These timesheets are often submitted daily rather than weekly.
Hourly workers
For shift-based or hourly workers, the timesheet is primarily a payroll tool rather than a billing tool. The format is simpler: clock-in time, clock-out time, break duration, and total hours for each shift. The total feeds directly into payroll. Overtime tracking is critical — shifts that exceed the standard threshold need to be correctly identified so the premium rate is applied.
Types of timesheets
Daily timesheet — one entry per task per day, the most granular format. Common in professional services and agency environments where task-level billing accuracy is required.
Weekly timesheet — summarises a full working week and is submitted once for review. The most widely used format across industries, typically aligned to a weekly payroll cycle.
Monthly timesheet — covers a full calendar month, used in salaried environments with monthly payroll or for long-duration project tracking where weekly detail is unnecessary.
Project-based timesheet — organised by project rather than by date. Shows all hours logged to a specific project across any period, useful for project managers tracking budget consumption.
Bi-weekly timesheet — covers two weeks, aligned to a fortnightly payroll cycle. Common in the US where bi-weekly payroll is the standard.
Digital and automated timesheet — generated automatically by a time tracking tool rather than filled in manually. The most accurate format because the record is created as work happens rather than reconstructed from memory.
What is timesheet management?
Timesheet management is the process of collecting, reviewing, approving, and using employee timesheet data — from submission through payroll processing, client billing, or project reporting.
The collection step is where most organisations encounter their first problem. Manual timesheets depend on employees remembering to submit them on time, in the right format, covering the right period. Late or incomplete submissions delay payroll, delay client billing, and make it impossible to track project costs in real time.
Review and approval comes next. A manager or supervisor checks that the hours are complete and accurate before signing off. In some systems this is a formal digital approval; in others it is an email confirmation. When a manager is travelling or unavailable, the approval becomes a bottleneck that can hold up the entire payroll cycle.
Once approved, the hours feed into payroll for hourly workers, into client invoices for billing organisations, and into project reporting for anyone tracking actual vs estimated hours. Timesheet data over time — weeks and months of it — reveals project health, capacity utilisation, overtime patterns, and the accuracy of the estimates the organisation uses for planning.
The most common timesheet management problems are late submissions, inaccurate hours from end-of-week reconstruction, missing project codes that make billing impossible, and the approval bottleneck when a single manager’s availability controls the entire process.
Employee timesheet — how it works in practice
For an employee on an hourly or client-billing arrangement, the timesheet cycle typically runs as follows.
During the week the employee logs time as they work — either in real time as tasks are started and switched, or at the end of each day from memory. Task descriptions are added for billing or project tracking. At the end of the pay period the employee reviews their entries, confirms the totals are correct, and submits to their manager or directly into the payroll system.
The manager reviews the submission, checks for completeness, flags any queries — a missing day, an unusually long or short entry — and approves. Once approved, the timesheet feeds into payroll, invoicing, or reporting depending on the organisation’s workflow.
The accuracy of this process depends entirely on when the employee logs. Time entries recorded in real time — at the moment a task starts, at the moment it ends — are significantly more accurate than entries reconstructed from memory at the end of the day or the end of the week. Research consistently shows that end-of-week reconstruction undercounts actual working time by 15 to 25 percent. For employees billing by the hour, that undercount is direct revenue loss. For managers using timesheet data to plan future projects, it produces estimates that are systematically too optimistic.
The problem with manual timesheets
The most significant problem with manual timesheets is reconstruction error. A task that took two and a half hours gets remembered as “about two hours.” A client call that ran over gets logged at the scheduled duration. A short task done between two longer ones is forgotten entirely. These errors are small individually but they compound — across a week, across a team, across a month of billing.
Submission delays are the second major problem. Manual timesheets depend on human memory and discipline. When employees are busy, timesheets get pushed to Friday afternoon and filled in from a hazy recollection of the week. When they are away, they get submitted late. Late submissions delay payroll, which is the most reliable way to erode employee trust in an otherwise functional organisation.
Format inconsistency compounds the consolidation problem. When ten employees submit timesheets in ten slightly different formats, the person processing them spends significant time standardising before they can actually use the data.
And manual timesheets provide no real-time visibility. A timesheet submitted on Friday tells the manager what happened last week. A project that went significantly over budget on Wednesday was invisible until the end of the week — at which point the opportunity to course-correct has passed.
How Time Bot replaces the timesheet in Slack
For teams using Slack, Time Bot generates an automatic, accurate timesheet from commands typed directly in Slack channels — no separate app, no end-of-week reconstruction, no format inconsistency.
Starting a task:
/t writing client proposal
Time Bot starts the clock and records the start time with a timestamp.
Switching to a new task:
/t reviewing API documentation
The previous task closes automatically. The transition is timestamped.
Taking a break:
/t break
Ending the day:
/t finish
The result is a complete record of every task, every transition, and every break — automatically organised by project (the Slack channel where the command was typed) and exportable to CSV. This is the timesheet, generated without anyone filling it in.
Managers receive a daily email report with each team member’s activity breakdown — tasks worked on, time per task, breaks taken, total hours. No submission required, no approval bottleneck, no Friday afternoon reconstruction.
For client billing, Time Bot generates PDF invoices directly from the recorded time data. Select the client (channel), the date range, and the hourly rate — the invoice generates with each task as a line item and the hours calculated from the actual log. The accuracy of the invoice is limited only by the accuracy of the time log, which is why real-time logging in the channel where work is already happening produces better billing data than any manual timesheet process.
For compliance purposes, the timestamped log satisfies working time record requirements in most jurisdictions and is exportable in CSV format for payroll providers and audit processes.
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FAQ
What is a timesheet? A timesheet is a record of the hours an employee or contractor worked during a specific period — showing when work started and ended, which tasks or projects the time was spent on, and the total hours logged. Timesheets are used for payroll, client billing, project management, and compliance with working hour regulations. The format can be paper, spreadsheet, dedicated software, or automatically generated by a time tracking tool like Time Bot in Slack.
What does a timesheet include? A timesheet typically includes the employee’s name and the period covered, a record of hours worked each day with start and end times or total hours, break time, task or project descriptions, regular versus overtime hours, and a total for the full period. In client-billing contexts it also includes billable versus non-billable designation and project or client codes. Most timesheets require manager approval before payroll processes the hours.
What is timesheet management? Timesheet management is the process of collecting, reviewing, approving, and using employee timesheet data. A complete timesheet management workflow covers submission, manager review and approval, payroll processing, client billing, and reporting. The most common problems are late submissions, inaccurate hours from end-of-week reconstruction, missing project codes, and approval bottlenecks when a manager is unavailable.
What is an employee timesheet? An employee timesheet is a record submitted by an individual employee showing how their working hours were spent during a pay period. It is the basis for calculating pay for hourly workers, generating client invoices for billable roles, tracking project time, and ensuring compliance with working hour regulations. Employee timesheets are typically submitted weekly or bi-weekly and approved by a manager before processing.
What is the difference between a timesheet and time tracking? A timesheet is the record — the document showing how hours were spent. Time tracking is the process of creating that record. Manual time tracking produces a timesheet by having employees fill in a form. Automated time tracking such as Time Bot in Slack generates the timesheet automatically from logged commands, producing a more accurate record with significantly less effort. The timesheet is the output; time tracking is the method.
Do I need a timesheet if my team uses Slack? If your team uses Slack, you can replace the manual timesheet entirely with a Slack-native time tracking tool like Time Bot. Instead of employees filling in a spreadsheet, they log time with simple commands in Slack channels — and the complete timesheet is generated automatically, organised by project, and delivered in a daily email report. The result is more accurate than manual timesheets and requires no submission, no approval bottleneck, and no format inconsistency.
