AIA Invoice Template

An AIA invoice follows the billing structure popularized by the American Institute of Architects' G702/G703 payment application system, which separates a project into a schedule of values with columns for previous billing, current billing, percentage complete, and retainage. Standard invoices typically list a flat total per service, while an AIA-style invoice shows cumulative project progress across multiple pay periods. This format gives lenders, owners, and general contractors a clear audit trail of how much work has been completed and paid to date, which is why it's the preferred structure for construction and architectural billing.

This template mirrors the layout and logic of AIA-style payment applications but is not the copyrighted document itself, since G702 and G703 are trademarked forms sold directly through AIA Contract Documents. Use this template for day-to-day invoicing, internal tracking, or projects where contracts don't mandate the licensed forms. If your contract, lender, or general contractor specifically requires the certified AIA form with its official numbering and certification language, you'll need to purchase that version separately. Many small firms use a template like this for routine billing and reserve the licensed forms for larger, contractually governed projects.

Retainage is calculated as a set percentage, commonly 5% to 10%, withheld from each progress payment until the project reaches substantial completion or a milestone defined in the contract. For example, on a $15,000 design phase billed at 100% complete with 10% retainage, the invoice would show $1,500 held back and $13,500 due. The retained amount is typically released in a final invoice once the owner or general contractor signs off on completion. Always confirm the exact retainage percentage in your contract before billing, since it varies by project size, region, and negotiated terms.

Architects typically break billing into recognized AIA phases: Schematic Design, Design Development, Construction Documents, Bidding or Negotiation, and Construction Administration. Each phase often carries its own percentage of the total design fee, such as 15% for schematic design or 20% for construction documents, allowing clients to see exactly what portion of the contract each line represents. Supplemental services like site analysis, project management, or additional site visits are usually billed separately, either as flat fees or hourly rates, rather than folded into the core phase percentages. This breakdown keeps billing transparent and easy for owners to verify against the original scope.

Property owners, general contractors, and construction lenders most commonly require AIA-style payment applications, since the format gives them a standardized way to verify progress before releasing funds. Construction lenders in particular rely on the schedule of values and percentage-complete columns to authorize draws against a loan, often requiring a site inspection to confirm the billed progress matches actual work. Government and institutional projects frequently mandate this format contractually because it creates a consistent paper trail across architects, contractors, and subcontractors on the same job. Firms working directly with private residential clients have more flexibility to use a simplified version.

Percentage-of-completion billing charges against a fixed design fee based on how much of a phase is finished, such as billing 60% of a $15,000 schematic design fee once that stage is largely done, while hourly billing charges a rate per hour for time-based tasks like site analysis or project management. Most AIA-style invoices blend both methods, using lump-sum percentages for core design phases and hourly or unit rates for supplemental services such as construction documentation billed per drawing hour. Keeping these two billing methods on clearly separated line items prevents confusion when a client reviews cumulative amounts billed versus the contract value.

The most frequent error is failing to properly net out previously billed amounts, which causes the current payment due to be overstated or understated compared to the schedule of values. Other common issues include inconsistent retainage percentages between line items, missing continuation sheet detail for multi-item projects, mismatched invoice numbers against prior submissions, and omitting the architect's certification statement confirming work quality and completion accuracy. Lenders and owners often reject applications outright when the percentage-complete figures aren't clearly tied to verifiable milestones. Double-checking cumulative totals against the original contract sum before submission avoids most delays.

The architect first certifies that the billed work matches actual project progress, then submits the payment application to the owner or their representative for review and signature. On lender-financed projects, a construction inspector or draw administrator often visits the site to confirm the percentage complete before authorizing disbursement. Once approved, payment is released according to the contract terms, with retainage held back until a later milestone or final completion. This multi-party verification step is what distinguishes AIA-style billing from a simple invoice, since it builds accountability directly into the payment workflow rather than relying on a single approval.