ThirdLine helps state and local governments find and recover missed revenue, duplicate payments, improper payments, vendor overcharges, and hidden billing errors — without adding work to already-stretched finance teams.

Revenue leakage happens when fees, taxes, licenses, and utility charges are missed or under-collected. Expenditure leakage happens when vendors are paid twice, paid incorrectly, overbill, or receive improper payments. ThirdLine helps identify both.
Billing rules, tax rules, license registries, and fee schedules change over time. Gaps create under-collections.
Duplicate invoices, vendor file issues, recurring service errors, and contract drift quietly drain budgets.
Finance and audit teams know these issues matter, but often lack the time, data access, and tools to review everything.
Start with one recovery category or review several at once. ThirdLine looks across ERP data, vendor records, payments, billing files, tax records, contracts, invoices, and supporting documents to identify recoverable dollars.
Find underreported hotel occupancy or lodging tax.
Identify rentals operating outside registration or tax rules.
Find vendors or local businesses missing required licenses.
Catch incorrect rates, missed charges, or inactive billing issues.
Review utility, cable, telecom, waste, and energy franchise payments.
Find missed telecom, fiber, utility, or occupancy fees.
Validate whether local fees were charged and collected correctly.
Find eligible costs not claimed or reimbursed.
Recover invoices paid twice or vendors paid in error.
Stop Vendor takeover or Employee Fraud.
Compare invoices to agreed prices, terms, and rates.
Find unused lines, wrong plans, tax errors, and billing drift.
Audit the government's own utility bills for overcharges.
Review waste, recycling, copier, printer, uniforms, and similar recurring spend.
Find split purchases, prohibited merchants, and missing support.
Not sure where to start? Send us one AP export, one vendor file, or one revenue source and we'll help identify the highest-probability recovery area.
Choose a recovery category, enter the annual dollars flowing through that area, and adjust the recovery assumption. The estimate is directional and can be refined after reviewing actual data.
Some governments can use a contingency recovery model. Others need a fixed-fee, software-supported, or tech-enabled service model. ThirdLine can help either way.
Start with no upfront cost. ThirdLine reviews selected historical data, identifies potential recoveries, and is paid only from confirmed recoveries.
Use ThirdLine’s analytics platform and public-sector experts to review recovery areas, monitor controls, and prevent future leakage through dashboards, alerts, and recurring analysis.
Procurement, legal, and audit requirements vary by government. ThirdLine can help your team evaluate which model fits your policies, purchasing process, and recovery goals.
ThirdLine helped the City of Virginia Beach identify and recover duplicate vendor payments, while also improving visibility into future duplicate and erroneous payments.
The City of Virginia Beach used ThirdLine's contingency audit approach to uncover recoverable overpayments to vendors and strengthen accounts payable oversight.
“We were surprised at how quickly ThirdLine’s analysis identified duplicate invoices we had missed.”
— Lyndon S. Remias, CPA, CIA
City Auditor, City of Virginia Beach
The engagement showed how contingency recovery work can create immediate budget impact while also surfacing process improvements that reduce the chance of future leakage.
A single invoice, account, vendor, or transaction may look reasonable in isolation. The recovery opportunity appears when you compare the full population: vendors, payments, contracts, licenses, tax records, billing rules, rates, receipts, and supporting documents.
The goal is simple: minimize burden on your team while maximizing recoveries. ThirdLine works from exports, invoices, contracts, billing data, and supporting records.
Pick the recovery areas with the best fit: revenue leakage, AP duplicates, vendor overcharges, utilities, telecom, or recurring spend.
We request the minimum useful data exports and supporting records needed to run the review.
Our team applies analytics, document review, and validation workflows to identify likely recovery opportunities.
We support recovery documentation and provide recommendations to prevent the same leakage from recurring.
Recovery is valuable. Prevention is better. ThirdLine can turn the same tests into repeatable monitoring so governments keep visibility into future duplicate payments, vendor changes, under-collections, and improper payments.
Convert one-time findings into recurring checks that run monthly, weekly, or nightly depending on the risk area.
Use recovery findings to improve vendor setup, approvals, billing rules, license compliance, contract management, and payment controls.
Document what was found, why it matters, how it was validated, and what management can do next.
Recovery work should be practical, transparent, legally reviewable, and easy for finance, audit, and procurement teams to evaluate.
A contingency fee audit is an audit where the provider is paid based on a percentage of confirmed recoveries instead of an upfront fee.
In many public-sector contexts, recovery audit contingency contracts are recognized, but governments should follow their own procurement rules, legal requirements, and audit policies. Federal OMB guidance defines recovery audit contingency contracts and says agency heads may enter into contingency contracts for recovery audit services.
Typically, AP transaction history, vendor master data, and invoice or payment documentation are needed. Depending on the review, ThirdLine may also request credit memos, vendor statements, purchase orders, contracts, and check or ACH payment detail.
There is no upfront cost. ThirdLine is paid only from confirmed recoveries.
Then there is no recovery fee. Your team still gains confidence that historical payments were reviewed.
Yes. ThirdLine works with government ERP data, including Tyler Munis, Workday, Oracle, SAP, CGI, Infor, and more.
Common owners include CFOs, finance directors, AP managers, internal auditors, city auditors, county auditors, controllers, and school district business officials.
No. Duplicate payments are one recovery category. ThirdLine also reviews revenue leakage, utility under-collections, hotel and tax fees, business licenses, recurring bill overcharges, vendor overpayments, and improper payments.
Yes. One-time recovery findings can be converted into continuous monitoring so future leakage, duplicates, and improper payments are caught faster.
Pick one area — utility billing under-collections, hotel and tax fees, business licenses, duplicate payments, improper payments, or recurring vendor bills — and ThirdLine will help you evaluate the recovery opportunity.