False invoicing, overbilling and theft of materials during execution
Contractors, supervisors or officials enable overbilling, inflated quantities and theft of materials through weak measurement and poor inspection and inventory controls.
Red Flags & Indicators
- Delivery notes, measurement records, or timesheets do not match site records or supervision reports.
- Invoices contain repeated corrections, duplicate charges, or billing for the same work in different periods.
- Inventory records show unexplained shortages, unusual waste, or missing high-value materials and fuel.
- Payment certificates are approved with limited inspection evidence or by the same person across several contract packages.
Stakeholder Guidance
Stakeholder Exposure
Exposure includes invoice approval pressure; risk of being solicited to collude or accused of overbilling; cash leakage via theft and diversion; payment delays, increased risk of disputes and rework; and reputational risk.
Decision Point
For each payment request, submit a progress invoice and material claim for certification proceed, with reconciled measurement and stock records.
Mitigation Actions
• Reconcile measurement records to site diaries and supervision logs
• Use three-way match for high-value materials and fuel
• Segregate invoice preparation, verification, and approval roles
• Require independent sign-off for corrections and duplicates
• Retain a complete audit file for each payment claim, including related to corrections and duplicates
• Use inventory and wastage controls (stock counts, issue registers, loss reports)
• Conduct internal investigation to clarify discrepancies, unexplained shrinkage or repeat variances before submitting payment claims, pausing payments pending investigation
• Use internal compliance escalation processes and whistleblower channels, where available, to report any pressure to certify false invoices or conceal theft
Mitigation Resources
Control invoices, quantities, delivery records, site receipts, payment support, and material movements through formal evidence requirements, independent verification, segregation of duties, and approval before claim submission, certification, or payment.
Change control, delivery verification, and payment integrity — https://toolbox.infrastructuretransparency.org/resource/change-control-delivery-verification-and-payment-integrity/Assess fraud risks and apply prevention, detection, investigation, and corrective-action controls to invoices, quantities, delivery records, site receipts, payment records, and material movements, including unexplained variances, duplicate claims, or suspected theft.
Fraud control management — https://toolbox.infrastructuretransparency.org/resource/fraud-control-management/Failure Cases
Good Practices
Stakeholder Exposure
Exposure includes release of funds against inflated progress; leakage and value loss; higher audit and ESG risk; and delays due to disbursement pauses during verification and disputed quantities.
Decision Point
At drawdown milestones, require certified progress reports on measurements and deliveries; initiate independent verification when discrepancies are identified and not explained.
Mitigation Actions
• Require spot checks and independent verification for high-risk items
• Require transparent payment system, inventory controls (material registers, fuel logs, stock counts) and timely disclosure of corrections and duplicates
• Treat unexplained variances as a suspension trigger
• Secure audit/verification rights over invoices, delivery records, and subcontractor payment flows (including changes in key suppliers/subcontractors)
• Request targeted independent review in case of discrepancies, suspending payments pending review
Mitigation Resources
Require, through financing conditions, formal evidence and independent verification for invoices and supporting execution records, including quantities, deliveries, payments, and material-control records, before disbursement or release of funds.
Change control, delivery verification, and payment integrity — https://toolbox.infrastructuretransparency.org/resource/change-control-delivery-verification-and-payment-integrity/Use an independent technical adviser to verify quantities, delivered outputs, and material-control evidence, and to challenge weak support for invoices, delivery records, payment records, or material movements.
Independent technical due diligence and monitoring — https://toolbox.infrastructuretransparency.org/resource/independent-technical-due-diligence-and-monitoring/Failure Cases
Good Practices
Stakeholder Exposure
Exposure includes budget leakage; inflated quantities and theft; higher risk of audit review and investigations; delays over payment disputes; risk of reduced service outcomes; and loss of public trust.
Decision Point
Before approving payments, certify quantities and verify site and inventory checks; withhold certification and initiate audit review when discrepancies are identified and not explained.
Mitigation Actions
• Maintain a complete auditable record for each payment certificate
• Maintain materials receiving and traceability records (goods received notes, stock/fuel logs, wastage reports)
• Investigate unexplained variances or repeat corrections before certifying payments, suspending payments pending review
• Publish payment records, including certified quantities, payment certificates, and reasons for material corrections or withholding decisions
• Refer signs of credible fraud and theft to independent oversight bodies, suspending payments pending review
• Publish project information based on recognised infrastructure data standards such as the OC4IDS
Mitigation Resources
Apply invoice validation and payment certification controls through formal evidence requirements, measurement reconciliation, goods-received records, timesheet verification, and independent approval before certification or payment.
Change control, delivery verification, and payment integrity — https://toolbox.infrastructuretransparency.org/resource/change-control-delivery-verification-and-payment-integrity/Maintain internal oversight of controls governing invoices, quantity records, delivery records, goods-received records, payment records, and material movements; test controls, follow up findings, and focus assurance on high-risk transactions and certification decisions.
Risk-based internal audit planning — https://toolbox.infrastructuretransparency.org/resource/risk-based-internal-audit-planning/Publish and maintain public access to key execution and payment records, such as certified quantities, payment certificates, and reasons for material corrections or withholding decisions.
Transparency and data disclosure standards — https://toolbox.infrastructuretransparency.org/resource/transparency-and-data-disclosure-standards/Failure Cases
Good Practices
Stakeholder Exposure
Exposure includes limited oversight and accountability over quantities, payments and measurement records; budget leakage and higher costs; risk of reduced service outcomes; increased safety and environment impacts from poor controls; and retaliation risk when reporting discrepancies.
Decision Point
During project execution, submit access to information to request payment, measurement and delivery records. Decide whether to (a) escalate through oversight channels to report inconsistencies and lack of transparency, or (b) monitor while safely gathering evidence.
Mitigation Actions
• Monitor visible progress, deliveries, and quality outcomes against reported payment milestones to identify repeated claims, rework, and discrepancies that do not match site conditions
• Mobilise communities around the importance of full transparency of payment information to ensure value-for-money
• Engage oversight bodies when discrepancies and signs of theft and falsified records are identified (use safe, confidential reporting and anonymisation where the risk of retaliation is significant)
• Advocate for disclosure of project information based on recognised infrastructure data standards such as the OC4IDS
Mitigation Resources
Track reported payments, deliveries, quantities, and outputs against visible site progress, material use, and quality outcomes; flag repeated claims, delivery gaps, rework, or other anomalies that suggest overbilling, false invoicing, theft, or leakage.
Expenditure tracking and leakage analysis — https://toolbox.infrastructuretransparency.org/resource/expenditure-tracking-and-leakage-analysis/Use independent monitoring or social accountability to compare disclosed execution and payment records with site conditions, delivered outputs, and observed material use; document unexplained gaps, track follow-up actions, and raise them through oversight channels.
Independent monitoring, assurance, and social accountability — https://toolbox.infrastructuretransparency.org/resource/independent-monitoring-assurance-and-social-accountability/Review publicly disclosed execution and payment records, including payment certificates, milestone definitions, and delivery or measurement records; identify disclosure gaps, missing justifications, or inconsistencies with site conditions, and raise concerns about non-disclosure with an oversight body.
Transparency and data disclosure standards — https://toolbox.infrastructuretransparency.org/resource/transparency-and-data-disclosure-standards/