What Makes a Proper Invoice? FAR 32.905 Requirements for Government Contractors

When federal funding timing is less predictable, contractors have fewer levers to pull. One of the most reliable is making sure every invoice meets the FAR 32.905 proper invoice requirements the first time. It will not speed up an agency, but it keeps avoidable, contractor-side delays out of your cash cycle.

Payment starts with a proper invoice

FAR 32.905(a) states that payment will be based on receipt of a proper invoice and satisfactory contract performance. Both parts matter. A proper invoice alone does not guarantee a payment date, because acceptance and the terms of your specific contract also affect timing. But an invoice that is not proper has to be corrected before it qualifies, and that can delay the payment cycle.

Proper invoice requirements under FAR 32.905

• Name and address of the contractor
• Invoice date and invoice number
• Contract number or other authorization, including the order number and contract line item number
• Description, quantity, unit of measure, unit price, and extended price of the supplies delivered or services performed
• Shipping and payment terms
• Name and address of the contractor official to whom payment is to be sent
• Name, where practicable, title, phone number, and mailing address of the person to notify if the invoice is defective
• Taxpayer Identification Number, if required by agency procedures
• Electronic funds transfer banking information, if required
• Any other information or documentation required by the contract

FAR 32.905(b)(1) lists what a proper invoice must include. For invoices covered by FAR 32.905(b)(1), use the list above as a checklist before submission. Your contract may require additional information, and interim payment requests under cost-reimbursement service contracts are treated separately under FAR 32.905(b)(2).

That last item on the list is where many contractors get caught. Your contract may require specific supporting documentation, certifications, receiving reports, or submission through a particular system. Read the invoicing instructions in the contract itself, in addition to the FAR list.

The full text of FAR 32.905 is available at acquisition.gov: https://www.acquisition.gov/far/32.905

What happens with a defective invoice

When an invoice does not meet these requirements, FAR 32.905 generally requires the designated billing office to return it within seven days after receipt, with the reasons it is not proper. Different time frames apply to certain contract types, such as meat, fish, and perishable agricultural products. The FAR also addresses what happens if the government does not return a defective invoice on time, including an adjustment in determining whether an interest penalty is owed.

The practical takeaway is simple. A defective invoice creates a correction loop, and any time spent in that loop is time your business is still carrying the cost of the work.

Build an invoice routine

A few habits keep most invoice problems from happening:

• Build an invoice template for each contract that already includes the contract number, order number, line items, and payment instructions.
• Keep supporting documentation, such as timesheets and receiving reports, organized as the work happens instead of at month-end.
• Know who performs acceptance on each contract and what they need to see.
• Track every submitted invoice weekly until it is paid, and follow up promptly if an invoice is returned.

When funding uncertainty is already affecting timing, avoid adding preventable invoice problems to the cash cycle. A proper invoice, accurate supporting documentation, and attention to acceptance requirements help keep contractor-controlled delays out of the process.

This article summarizes FAR 32.905 for general education. Always follow your contract’s specific invoicing instructions. This is not legal or individualized financial advice.