Agency billing depends on scope, rates, and utilization. Everhour connects time tracking with budgets for client work.
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For an agency, the core question is not only "how many hours were worked?" It is "which approved hours are billable under the client agreement, at which rate, and against which budget?" The answer supports a time-and-materials invoice, a retainer burn check, or a fixed-fee margin review. It also separates client-facing delivery from internal admin, sales support, training, and rework that the client agreement excludes.
Agency billing increments are contract-defined. Agency compensation guidance covers hourly, daily, FTE, retainer, fixed-fee, commission, and performance models, but it does not set one universal six-minute or 15-minute increment. Use the scope, rate card, or billing policy that applies to the account. If the agreement uses role rates, calculate each role separately before adding the total.
Agencies do not sell most work as pure hourly billing. SPI Research reported that agencies sold 60.4% of work as fixed time/fixed fee in 2024, while 18.3% was time and materials. That changes what the calculation means. On a T&M project, billable hours usually produce the invoice amount. On a fixed-fee or retainer project, the same hours show budget burn, margin pressure, and the implied hourly rate.
A practical decision point is whether to invoice hours or use them as a control metric. If a $12,000 monthly retainer absorbs 92 approved billable hours, the implied rate is $130.43 per hour before any taxes or write-downs. If the agency rate card expects a higher blended rate, the account is using the budget too quickly even when the client invoice stays fixed.
The basic hourly formula is unit rate × hours or days. For an agency invoice with role-based rates, multiply each approved billable total by that role's rate, then add the line items. For example, a campaign production job includes 18 designer hours at $140 per hour, 9 strategist hours at $190 per hour, and 7 account manager hours at $125 per hour.
The calculation is $2,520 for design, $1,710 for strategy, and $875 for account management, for a pre-tax billable total of $5,105. In the United States, there is no federal VAT/GST or single national sales-tax rate for billed professional time. State and local tax treatment controls whether a jurisdiction-specific tax input belongs on the final invoice.
A calculator is enough for a one-time client estimate, a quick T&M invoice check, or a fixed-fee postmortem where the approved hours and rates are already clean. It is also enough when the question is narrow: one client, one date range, one rate card, and no disputed non-billable work. The output gives a clear dollar amount or utilization figure.
A managed workflow is needed when billable status, budgets, and approvals change while work is still happening. Everhour Project Budgeting tracks time and money budgets, recurring periods, budget alerts, budget protection, expense inclusion controls, multiple billing methods, and client-level budgets, so agency teams can compare approved billable work with the live commercial limit 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 approved time entries, remove non-billable work, group the remaining hours by the contract's billing structure, and multiply each group by its rate. The structure can be role, department, blended rate, project rate, day rate, or FTE model. For retainers and fixed-fee work, the same hours measure budget burn and implied rate rather than automatically creating an hourly invoice.
No. SPI Research reported that agencies sold 60.4% of work as fixed time/fixed fee in 2024 and 18.3% as time and materials. Hourly math still matters on fixed-fee and retainer accounts because it shows whether the agreed fee covers the actual delivery effort. It also helps identify scope creep before margin disappears.
SPI Research reported agencies at 1,232 annual billable hours out of 1,982 total hours in its 2024 annual-hours benchmark. AMI uses a 1,880-hour agency work-year baseline and role targets such as 75% for creatives, 80% for project or production managers, and 70% for senior account staff. Compare like roles instead of using one target for everyone.
Use the increment defined in the scope, rate card, or billing policy. Agency compensation guidance describes several compensation models but does not prescribe a universal agency billing increment. A common mistake is borrowing a legal billing increment or a previous client's policy. That creates inconsistent invoices and makes realization analysis unreliable across accounts.
There is no federal VAT/GST or national sales-tax rate in the United States. Sales tax treatment is state and local, and some services are taxable while others are not. For example, New Mexico gross receipts tax includes performing services in New Mexico, while Texas taxes taxable services at a 6.25% state rate plus local additions up to an 8.25% combined maximum.
Everhour Project Budgeting lets agencies track time and money budgets as people log work, including recurring budget periods and client-level budgets. Budget alerts can notify selected admins at defined thresholds, and budget protection can stop timers or prevent additional time logging after a budget is exceeded.
Use billable-hour math for spot checks, then track approved time against live project budgets. Everhour gives agency teams budget visibility before billable work becomes an invoice problem.
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