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An accurate billable-hours calculation answers how much client-chargeable work becomes billable revenue after rounding, rate assignment, and write-downs. The basic result is a dollar amount: billable time multiplied by the applicable rate. For U.S. work, totals are normally denominated in USD because United States coins and currency, including Federal Reserve notes, are legal tender for debts, public charges, taxes, and dues.
The calculation also helps separate worked time from billed time. A team member may work 48 hours, mark 39 hours as billable, round those entries to the client's billing increment, then write down 2 hours before invoicing. The final invoice total should reflect the client agreement, not a rough memory of time spent.
Accuracy breaks first at the rounding step. A six-minute increment equals 0.1 hour, so 23 minutes becomes 0.4 hours when rounded up to the next tenth. A 15-minute increment equals 0.25 hour, which creates larger jumps. Use the increment stated in the engagement letter, master services agreement, or billing policy before multiplying by the rate.
For example, three approved entries at a $200 hourly rate round to 0.2, 0.6, and 0.9 billable hours. The charges are $40, $120, and $180, for a $340 total. If those entries were rounded to a different increment, the invoice amount would change even though the underlying work did not.
The core formula is rounded billable hours × billable rate = billable amount. If several people, tasks, matters, or projects have different rates, calculate each line separately, then add the line totals. Do not average rates unless the client agreement uses a blended rate. A $150 associate hour and a $300 partner hour are separate billing inputs.
Write-downs reduce billed time or billed amount after the raw billable total is calculated. That is why utilization, realization, collection, and effective billing rate are different metrics. Utilization compares billable time with total work time. Realization compares billed value with billable value. Collection compares paid value with billed value. Effective billing rate divides collected revenue by hours worked or billed.
The United States has no federal VAT/GST or national sales-tax rate for billed professional time. Sales tax treatment is state and local, and some services are taxable while others are not. A U.S. billable-hours calculation needs a jurisdiction-specific tax input only when the billed service is taxable in the applicable location.
State examples show why a single default tax rate is inaccurate. Hawaii applies general excise tax to business activities at 4% for most activities, plus county surcharge where applicable. New Mexico gross receipts tax includes performing services in New Mexico, with combined rates from 5.125% to 8.6875%. Texas taxes taxable services at 6.25% state, up to 8.25% combined.
A calculator is enough when you need to price a short entry, validate a single invoice line, or check whether rounding changed the amount. It is also enough for a quick client estimate when tax, discounts, expenses, and write-downs are handled elsewhere. Keep the inputs visible so the result can be traced back.
A managed workflow becomes necessary when multiple people log time, managers approve entries, rates vary by person or task, or invoices need backup. Everhour Reporting gives teams customizable reports with 45+ columns, grouping, filters, exports, and scheduled email delivery, so billable time, non-billable time, billable amount, and cost stay auditable before invoicing.
This content is for general information only, may not be fully up to date, and is provided without any warranty or liability.
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Start with time entries marked billable, apply the billing increment required by the client agreement, multiply each rounded entry by its assigned rate, then subtract approved write-downs. If multiple rates apply, calculate each rate group separately before adding the totals. Add tax only when the billed service is taxable in the relevant state or local jurisdiction.
Convert minutes to hours, then round according to the billing increment in the contract or policy. A 0.1-hour increment equals six minutes. A 0.25-hour increment equals 15 minutes. Rounding every entry separately usually produces a different result than rounding the day's total, so use the method the client agreement requires.
Billable hours are time entries eligible to be charged to the client. Billed hours are the hours actually placed on the invoice after review, rounding, write-downs, or exclusions. If 42 hours are billable and 3 hours are written down before invoicing, billed hours are 39 hours.
Realization falls below 100% when billed value is lower than billable value. Common causes include write-downs, courtesy discounts, billing caps, fixed-fee limits, or removing entries that were marked billable but should not be charged. Realization is not the same as collection; collection measures whether the client paid the billed amount.
There is no federal VAT/GST or national sales-tax rate for billed professional time in the United States. Tax treatment is state and local. Some states tax certain services, some do not, and rates can vary by municipality. Use a jurisdiction-specific tax input only when the service is taxable.
Everhour Reporting lets admins build reports with columns for billable time, non-billable time, billable amount, and cost, then group or filter by project, task, client, member, or date range. Reports can be exported in CSV, Excel/XLSX, or PDF for invoice backup and review.
Everhour supports project-level billing status and task-level non-billable controls, so specific work can be excluded from billable totals while staying available for reporting. Admins can also use project, member, or custom task rates to price time according to the client arrangement.
Use Everhour Reporting to review billable time, non-billable work, billable amount, and cost before invoices go out, giving every billing decision a clear audit trail.
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