Any hourly work — contracting, virtual assistance, bookkeeping, development — bills on this skeleton: hours × rate per line, grouped by task or by week, with the period and increment policy stated. This template prefills it with the overtime line pre-agreed at 1.5×, the multiplier clients accept when it was visible before the crunch.
The quantity field takes decimals (9.5 hours), and grouping lines by week or by task keeps a month’s work reviewable in five seconds — which is the real fight in hourly billing: not the rate, but the approver’s confidence in the hours.
Increment and rounding, stated once
Bill in 15-minute increments (0.25) and say so in the terms — six-minute lawyer-style increments read as petty outside law, and hour-minimums read as padding. State the policy once on every invoice and rounding disputes never start.
Group hours meaningfully: by week for ongoing roles, by task for project work (“onboarding flow revisions — 6.5 hrs”). Twenty one-line entries invite auditing; three grouped lines with a task summary invite approval.
Protecting the rate
Overtime, rush and out-of-hours multipliers only work pre-agreed — the invoice’s job is to carry the already-known number, never to introduce it. Same for rate increases: the “rate review annually” term plants the flag that makes next year’s adjustment a calendar event, not a confrontation.
If a timesheet tool logs your hours, name it (“hours logged via Toggl, report available”) — verifiable hours close the trust gap that makes hourly clients slow payers.
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Frequently asked questions
How detailed should hourly line items be?
Grouped, not granular: lines by week or by task with a bullet summary in the notes, and the detailed timesheet available on request. Detail on demand beats detail by default.
What increments should I bill in?
15 minutes is the broadly-accepted standard. Whatever you choose, print it in the terms — the stated policy is what makes rounding uncontroversial.
Can I bill overtime at a higher rate?
Only if the engagement agreement defines a higher rate or rush premium. Replace the example with the actual trigger and multiplier agreed with the client.
Weekly or monthly invoicing for hourly work?
Monthly for retained clients, weekly for new or high-volume engagements. Never let unbilled hours exceed what you could afford to lose in a dispute.