Public Works Invoice Instructions

Accurate invoicing is a critical component of any publicworks contract. It guarantees that contractors receive timely payment, helps agencies track expenditures, and ensures compliance with local, state, and federal regulations. The purpose of this guide is to provide a clear, stepbystep set of instructions for preparing and submitting invoices for publicworks projects.

1. General Principles

• Contract Alignment: Every invoice must reflect the terms, rates, and units of measurement defined in the signed contract.
• Timeliness: Submit invoices according to the schedule stipulated in the contractusually monthly, biweekly, or upon completion of a milestone.
• Completeness: Missing or incomplete information can cause delays, additional queries, or outright rejection.
• Documentation: Attach all required supporting documents (e.g., progress reports, certified payroll, material receipts).
• Transparency: Use clear language and avoid abbreviations that are not defined in the contract.

2. Required Invoice Elements

The following items must appear on every invoice submitted for a publicworks contract:

3. StepbyStep Submission Process

Step 1 Verify Contractual Requirements

Review the contract, Supplementary Agreement, and any applicable procurement regulations (e.g., FAR, State Procurement Rules). Note any special invoicing clauses such as required forms (e.g., DD1155), electronic submission portals, or mandatory attachments.

Step 2 Prepare the Invoice

1. Use the agencyapproved template or electronic format.
2. Populate all required fields listed in Section2.
3. Calculate totals using the schedule of values; crosscheck quantities against the latest progress report.
4. Attach supporting documents:
   • Certified payroll records (if required)
   • Delivery receipts for materials
   • Inspection or acceptance certificates
   • Approved change order letters
5. Apply any retainage percentages as stipulated.
6. Sign and date the certification statement.

Step 3 Internal Review

Before sending the invoice to the agency, conduct an internal audit:

• Confirm that the invoice number follows the established sequence.
• Verify that all calculations are correct and that the total does not exceed the remaining contract balance.
• Ensure that any change orders referenced have been officially approved.
• Check that supporting documentation is legible and complete.

Step 4 Submit the Invoice

Follow the method dictated by the contract:

• Electronic Portal: Upload the PDF and attachments, then confirm receipt via the portals confirmation screen.
• Email: Send to the designated procurement officer, using the subject line Invoice [Contract #] [Invoice #]. Include a brief cover note.
• Physical Mail: Use a courier service with tracking; attach a copy of the sending receipt.

Step 5 Track Acceptance

After submission:

1. Record the date of submission and any reference number given by the agency.
2. Monitor the portal or email for acknowledgments, queries, or requests for clarification.
3. Respond promptly to any notices; failure to do so may result in payment delays.

4. Common Reasons for Invoice Rejection

Understanding typical pitfalls helps avoid costly setbacks.

• Missing contract number or incorrect invoice number.
• Quantities that do not match the approved schedule of values.
• Unapproved change orders listed as billable.
• Failure to include required certifications (e.g., labor compliance statements).
• Incorrect retainage calculation.
• Illegible or incomplete supporting documents.

5. Payment Terms & Timing

Publicworks contracts normally specify a payment periodoften 30 days from receipt of a correct invoice. Some agencies apply a paywhenpaid clause that ties contractor payment to the owners receipt of funds. Verify the exact terms in your contract and consider the following:

• Submit invoices early in the month to align with the agencys processing cycle.
• If a retainage is held, track its release schedule, often tied to final project acceptance.
• Maintain cashflow projections that incorporate the agencys typical payment lag.

6. Audit & RecordKeeping Requirements

Government agencies may audit invoices up to three years after payment. To be auditready:

• Retain copies of every invoice, supporting documents, and correspondence for at least the statutory period.
• Store records in a searchable digital format (PDF/A) and back them up securely.
• Ensure that labor records comply with DavisBacon, prevailingwage, or other applicable statutes.
• Document any verbal agreements in writing and have them signed.

7. Frequently Asked Questions

Q: Can I bill for work that is not yet inspected?

A: Generally, no. The invoice must reference an acceptance or inspection report dated prior to billing, unless the contract expressly allows provisional billing.

Q: What if a change order is approved after I submit the invoice?

A: Submit a supplemental invoice for the newly approved amount. Reference the original invoice number and the change order number in the description.

Q: How do I handle partial payments?

A: Indicate the amount being invoiced and clearly note the retainage percentage held. When the retainage is released, submit a final invoice showing the retained amount as the only line item.

Q: Are electronic signatures acceptable?

A: Most agencies accept digital signatures that comply with the Electronic Signatures in Global and National Commerce Act (ESIGN) and agencyspecific policies. Verify before using them.

8. Final Checklist Before Sending

• Contract number, invoice number, and date entered correctly.
• All line items match the latest approved schedule of values.
• Change orders are referenced with their approval dates.
• Retainage is calculated per contract terms.
• All required attachments are included and clearly labeled.
• Signature and certification statement are present.
• Submission method follows contract specifications.

Following the guidelines above will streamline the invoicing process, reduce the likelihood of payment delays, and maintain compliance with publicworks regulations. For any uncertainties, contact the procurement officer listed in the contract or consult the agencys invoicing handbook.