Quick answer
A useful weekly timesheet needs seven columns: date, client, project, task, duration, billable status, and a short note. Every additional column adds admin without adding information anyone uses downstream.
This guide is written for freelancers, small teams, and managers building a timesheet habit who want time tracking to support better planning, billing, reporting, and project decisions.
The seven columns a weekly timesheet needs
Each column earns its place by feeding something downstream. Date and duration feed payroll and totals. Client and project feed invoices. Task and note explain the work when a client or a manager asks. Billable status separates revenue hours from everything else.
Together they let one sheet answer the three questions that actually get asked later: what do we bill this client, where did the week go, and what was this entry for.
- Date: the day the work happened
- Client: who the work was for
- Project: which engagement it belongs to
- Task: the specific piece of work
- Duration: hours in a consistent increment, 15 or 30 minutes
- Billable: yes or no
- Note: one sentence a client could read
Columns to leave out
Templates accumulate columns the way projects accumulate scope. Start and end times add nothing over duration for knowledge work unless payroll law requires them. Percent-complete, mood, location, and category-plus-subcategory-plus-tag schemes produce cells people fill with guesses to make the row complete.
The test for any column is a name: who reads this, and what do they decide with it. A column without a reader is not data collection, it is homework.
How to fill it in without reconstructing the week
The template is the easy part; the habit is the product. Hours logged the same day are records, while hours reconstructed on Friday afternoon are estimates that systematically drop the small entries: the quick call, the ten-minute fix, the email thread that took half an hour. Those missing fragments are usually billable.
The workable rhythm is two minutes at the end of each day, plus a five-minute pass at week's end to check totals, fill obvious gaps, and make notes readable. Anyone who cannot remember Tuesday by Friday has discovered exactly why the daily pass matters.
A worked example
A realistic Tuesday for a freelance designer might read: Acme Co, website redesign, homepage revisions, 2.5 hours, billable, 'Applied second-round feedback to hero and pricing sections.' Then: Acme Co, website redesign, client call, 0.5 hours, billable, 'Walkthrough of revised homepage with marketing team.' Then: internal, admin, invoicing, 1 hour, non-billable, 'Prepared June invoices.'
Note what the three rows already support: an invoice line a client would accept without a phone call, a visible split between delivery and coordination, and a record of where the non-billable hour went. No column beyond the seven was needed.
Review the sheet before it goes anywhere
A timesheet that flows straight into an invoice or payroll unreviewed will eventually export its mistakes. The review is short: every workday has entries, every entry has a project, billable flags match the actual agreements, and notes would survive a client reading them.
For a solo freelancer this is five minutes before invoicing. On a team it is the manager's weekly pass, and it is also where a timesheet habit either earns trust or loses it, because a sheet nobody reads is a sheet nobody maintains.
Where the spreadsheet breaks
A spreadsheet holds the seven columns perfectly well until the questions change. The moment you need hours summed across weeks by project, an approval step before invoicing, or an invoice built from the entries themselves, the spreadsheet becomes a copy-paste pipeline, and every manual hop is a place errors enter.
The breaking points are predictable: more than two or three people submitting, billing disputes that require an audit trail, retainers that need running balances, or reporting that spans months. Time tracking software exists to keep the same seven fields connected to the invoices and reports they feed, instead of re-keying them every cycle.
When a spreadsheet is genuinely enough
A solo freelancer with two or three clients, simple hourly billing, and no approval workflow does not need software. One sheet per week, seven columns, a daily two-minute habit, and a monthly copy into invoices will work for years. Switching tools will not improve data that a habit is already producing cleanly.
Move to software when the spreadsheet starts costing hours instead of saving them: re-keying entries into invoices, chasing teammates for their tabs, or scrolling months of rows to answer one budget question. The template is not the constraint; the manual plumbing around it is.
Where Zeitio fits
Zeitio helps teams connect tracked hours to clients, projects, tasks, reports, approvals, and invoices so time data becomes useful business context instead of another spreadsheet.
Start with simple time entries, review them weekly, and use the data to improve project planning, billing accuracy, and team workload decisions.
Compare Zeitio pricing or create a workspace to try the workflow.
Further reading
FAQs
What should a weekly timesheet template include?
Seven columns: date, client, project, task, duration, billable status, and a one-sentence note. Those fields cover invoicing, payroll totals, and work explanations. Additional columns like start and end times or completion percentages rarely have a downstream reader.
How detailed should timesheet entries be?
One row per distinct task with a duration in 15 or 30 minute increments and a single client-readable sentence as the note. Finer detail increases logging effort without improving the invoices or reports the timesheet feeds.
Should timesheets be filled daily or weekly?
Log entries daily and submit weekly. Same-day entries are accurate records, while a week reconstructed on Friday systematically loses the short tasks, which are often billable. Two minutes a day beats thirty minutes of Friday archaeology.
When should a team switch from spreadsheet timesheets to software?
When the manual plumbing starts costing real hours: more than two or three people submitting sheets, entries re-keyed into invoices, approval steps handled over email, or reporting that spans months of rows. The seven-column structure stays the same; software keeps it connected to invoices and reports automatically.
Do timesheets need start and end times?
For most knowledge work, duration alone is enough for invoices and reports. Start and end times matter when payroll rules for hourly employees require them or a client contract demands that level of accountability, so check those obligations before adding the columns.