Ad agency billing mixes retainers, billable hours, and media costs, and Everhour keeps rates and invoices organized.
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Use this page when you need to bill a client for agency work such as paid media management, campaign strategy, creative production, research, direct marketing, or interactive media. The finished invoice should show the client, invoice number, invoice date, payment terms, service period, line items, reimbursable costs, taxes when applicable, and the amount due.
Agency billing usually follows the contract. A monthly retainer can cover a defined scope or capped involvement, while hourly work depends on tracked billable hours multiplied by a blended rate or specialist rates. Project fees work better for defined campaigns with milestones. Performance-based fees need the agreed KPI and measurement period on the invoice.
Start with client and agency details, then add a clear billing period such as March 1, 2026 through March 31, 2026. Keep each line item specific: "Paid search management, March retainer," "Creative concept development, senior strategist, 12 hours at $175," or "Landing page production milestone 2." Clear descriptions reduce approval questions.
Add payment terms after the subtotal and tax area. Net 30 means full payment is due within 30 days. Early-payment terms such as 1%/10 net 30 give a 1% discount if the client pays within 10 days. For United States private-sector invoices, no single federal invoice form applies, but invoices still serve as supporting records for business income and expenses.
Ad agencies should separate service fees from media, production, and reimbursable third-party expenses when the client agreement treats them differently. A client approving a $6,000 retainer needs a different review path than a $24,000 media buy or a pass-through production vendor charge. Mixed lines slow approval because finance teams cannot see the margin-sensitive items.
Asset identifiers also matter for campaign work. AD-ID codes identify advertising assets and carry metadata such as title, length, and product information. Standard-definition ads use 11-character codes, while high-definition or 3D ads use 12-character codes. Put relevant asset codes on the invoice or supporting detail when the client uses them for trafficking, reconciliation, or internal approvals.
A one-off template is enough for a simple monthly retainer, a fixed project milestone, or a small expense reimbursement. Fill the fields, attach backup where the client expects it, and send the invoice with the agreed payment terms. Keep a copy because invoices support business records and client payment history.
A managed workflow fits better when multiple team members bill at different rates, projects carry separate budgets, or uninvoiced time needs review before billing. Everhour separates cost and billable rates, supports per-person defaults and per-project overrides, preserves dated rate history, and prices billable work by project, member, or task.
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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An ad agency invoice should include agency and client details, invoice number, invoice date, service period, payment terms, line-item descriptions, quantities or hours, rates, reimbursable expenses, tax when applicable, and the amount due. Campaign invoices also benefit from project names, campaign names, PO numbers, and asset identifiers where the client uses them.
A single invoice can include retainers and project work if the client agreement allows it and the line items stay separate. Put the monthly retainer on its own line, then list project milestones, extra billable hours, media costs, or expenses separately. This structure protects scope clarity and makes client approval easier.
United States invoices do not use a national VAT or GST invoice regime. Sales and use tax obligations come from state and local rules, and service taxability depends on the state and service type. A taxable sale can require state-level registration, such as a seller permit or sales-tax account, rather than a United States VAT number.
Separate the agency service fee from media spend, production costs, and reimbursable expenses. The invoice should also show the campaign, channel, billing period, and any PO or asset reference the client uses. This detail lets the client match the invoice to approved budgets, insertion orders, and campaign records.
Performance-based fees can go on a standard invoice when the contract defines the KPI, measurement period, and fee calculation. The invoice should name the metric, state the reporting period, and reference the agreed pricing basis. Supporting documentation belongs with the invoice when the client needs proof before approval.
Everhour separates cost and billable rates so an agency can track internal labor cost and client-facing revenue in the same workflow. Members can have default rates, projects can override those rates, and billable work can be priced by project, member, or custom task rate.
Use Everhour to keep agency rates, project overrides, and dated rate changes tied to billable work, then turn approved time into cleaner client billing.
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