Monthly billable totals depend on rates, approved hours, and write-downs. Everhour keeps project budgets tied to logged work.
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Industry average is 75–80%
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A monthly billable-hours calculation answers how much approved client work can be charged for a defined month. The core output is billable hours, billable amount, and sometimes an effective billing rate. It separates client-chargeable time from internal work, training, admin, prospecting, write-downs, and other time that should stay out of the invoice.
For U.S. work, billable-hour totals are normally denominated in U.S. dollars. There is no federal VAT/GST or national sales-tax rate for billed professional time. If a service is taxable, the tax input must match the state and local jurisdiction, not a single U.S. default.
Start with approved time entries inside the month, then keep only entries marked billable. Group them by rate when different people, tasks, or services bill at different prices. The basic formula is billable hours multiplied by billing rate, repeated for each rate group, then added into one monthly subtotal before taxes, discounts, retainers, or write-downs.
For example, a monthly client file includes 24 strategy hours at $180 per hour, 16 production hours at $125 per hour, and 8 QA hours at $95 per hour. The billable amount is $4,320 + $2,000 + $760 = $7,080. Across 48 billable hours, the effective billing rate is $147.50.
The common mistake is treating worked hours, billable hours, and billed hours as the same number. Worked hours include everything done during the month. Billable hours are the approved chargeable portion. Billed hours are what actually appears on the invoice after write-downs, client caps, retainer limits, or fixed-fee adjustments.
Rounding also changes the monthly total. A 6-minute increment records time in 0.1-hour units, while a 15-minute increment records time in 0.25-hour units. Apply the client's billing increment consistently at the entry level or according to the contract. Do not round the monthly subtotal if the agreement requires entry-level rounding.
Monthly billable-hours math usually stops at the pre-tax amount due, but payment timing can matter for cash planning. For federal-agency vendor invoices, Prompt Payment rules generally use the contract date, accepted discount terms, an accelerated-payment rule, or 30 calendar days after receipt of a proper invoice.
For private clients, use the contract, engagement letter, or invoice terms. For U.S. lawyers, ABA Model Rule 1.5 requires the scope of representation and the basis or rate of fees and expenses to be communicated in writing for new client-lawyer relationships, subject to the rule's limited low-cost exception.
A one-off calculation is enough when you are checking a single client, one rate, and a clean month of already approved entries. It gives a quick subtotal and exposes obvious errors, such as non-billable admin time being included in the invoice base.
A managed workflow is better when the same client repeats monthly, budgets reset, or several people bill at different rates. Everhour Project Budgeting supports time and money budgets, recurring budget periods, budget alerts, budget protection, and multiple billing methods, so monthly billable work can be checked before it overruns the agreed limit.
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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Billable hours are approved hours during the month that the client agreement allows you to charge. Internal meetings, training, admin, sales work, and corrected or written-down entries should stay separate unless the contract makes them billable. Use the invoice period dates consistently, especially when work crosses month-end.
Multiply each group of monthly billable hours by its billing rate, then add the results. If one person bills 24 hours at $180 and another category bills 16 hours at $125, calculate each line separately before adding them. Apply write-downs, discounts, retainers, and jurisdiction-specific taxes after the billable subtotal if they apply.
Non-billable time should not be included in the invoiceable monthly total. Keep it visible for utilization and profitability analysis, but exclude it from the amount charged to the client. Mixing non-billable time into billable totals overstates revenue and creates invoice disputes.
Billing increments convert raw time into chargeable units. With 0.1-hour billing, 6 minutes equals 0.1 hours. With 0.25-hour billing, 15 minutes equals 0.25 hours. The monthly total changes depending on whether the agreement requires rounding each entry or summarizing exact time first.
No. The United States has no federal VAT/GST or national sales-tax rate for billed professional time. Sales tax and similar treatment are state and local. Some services are not taxed, while taxable services need the correct jurisdiction-specific input before the final invoice total is calculated.
Everhour Project Budgeting tracks time and money budgets as people log work, with recurring budget periods for monthly retainers or ongoing projects. Budget alerts can notify admins at set thresholds, and budget protection can stop timers or prevent extra logging after the limit is exceeded.
Everhour Billing & Invoicing can turn tracked billable time and expenses into invoices, while excluding non-billable work. Invoice data can be grouped by project, task, person, date, or another available breakdown before export to QuickBooks Online, Xero, or FreshBooks.
Set monthly budgets, watch billable time before it overruns, and protect recurring client work from late invoice surprises. Everhour Project Budgeting keeps logged hours connected to budget limits.
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