Government Contract Invoice Processing: Getting Paid Faster

Federal contracts have specific requirements for invoice content and submission that differ from commercial invoicing.

Basic invoice elements:

• Contractor name and address
• Invoice date and number
• Contract number and task/delivery order number
• Description of work/deliverables
• Quantity and unit price
• Total amount due
• Payment terms
• Taxpayer Identification Number (TIN)

Contract-specific requirements:

• CLIN/SLIN breakdown
• Period of performance covered
• Cumulative amounts (current + prior invoices)
• Remaining contract balance
• Supporting documentation

Regulatory requirements:

FAR 32.905 specifies proper invoice requirements. Your contract may have additional requirements in the payment clause.

Wide Area Workflow (WAWF):

DoD's electronic invoicing system at wawf.eb.mil:

• Required for most DoD contracts
• Contractor creates and submits invoices
• Government reviews and approves
• Feeds to payment systems

Invoice Processing Platform (IPP):

Civilian agency system at ipp.gov:

• Treasury's government-wide invoicing platform
• Used by many civilian agencies
• Similar workflow to WAWF

Agency-specific systems:

Some agencies have proprietary invoice systems. Check your contract for specific requirements.

System access:

• Register in the appropriate system before submitting
• Ensure proper user roles and permissions
• Train staff on system procedures
• Keep login credentials current

Firm Fixed Price (FFP):

• Invoice upon delivery/acceptance of deliverables
• Or at milestones per contract schedule
• Simple invoice — deliverable, price, payment due
• No cost breakdown required

Time & Materials (T&M):

• Invoice labor hours worked by category
• Invoice materials at cost (plus handling if allowed)
• Supporting timesheets may be required
• Monthly invoicing typical

Cost Reimbursable:

• Invoice allowable costs incurred
• Detailed cost breakdown required
• Subject to incurred cost audit
• Provisional billing rates
• Fee billed separately

Progress payments (FFP):

• Percentage of costs incurred
• Requires cost substantiation
• Liquidated from final payments

Milestone payments:

• Defined payment upon reaching milestones
• Must demonstrate milestone achievement
• Documentation of completion required

Government review workflow:

1. Submission — Contractor submits invoice electronically
2. COR review — Technical representative verifies work was done
3. Acceptance — COR accepts deliverables/services
4. CO approval — Contracting officer approves payment
5. DFAS/Finance — Payment office processes payment
6. Payment — Funds transferred to contractor

Prompt Payment Act:

Government must pay within:

• 30 days for most invoices
• 14 days for perishable/fast-pay contracts
• 7 days for specified commodities

Interest accrues on late payments (automatic, no need to request).

Clock starts when:

• "Proper invoice" received, AND
• Goods/services accepted, AND
• All required documentation received

Reasons invoices get rejected:

Administrative errors:

• Wrong contract or order number
• Missing required information
• Math errors
• Wrong format
• Missing supporting documentation

Performance issues:

• Work not accepted by government
• Deliverable not received
• Quality problems requiring correction
• Incomplete performance

Billing issues:

• Exceeds funded amount
• Wrong CLIN charged
• Rates don't match contract
• Cumulative billing exceeds contract value

Impact of rejections:

• Payment clock resets when you resubmit
• Cash flow delays
• Administrative burden
• Pattern of rejections looks bad

Invoice preparation:

• Verify all information before submitting
• Use a checklist for required elements
• Match contract terms exactly
• Attach all required documentation

Timing:

• Invoice promptly — every day delayed costs you
• Don't batch multiple periods unnecessarily
• Submit early in the week (not Friday afternoon)
• Align with government fiscal cycles when possible

Communication:

• Coordinate with COR on acceptance timing
• Alert government before submitting large invoices
• Follow up if approval seems delayed
• Build relationships with payment office

Systems management:

• Keep system access current
• Train backup personnel
• Test submission process periodically
• Monitor invoice status in system

T&M and labor hour contracts:

• Timesheets signed by employee and supervisor
• Hours by labor category and CLIN
• Description of work performed

Materials and ODCs:

• Receipts or purchase orders
• Vendor invoices
• Travel vouchers and receipts
• Evidence of receipt/use

Cost reimbursable contracts:

• Detailed cost breakdown
• Direct labor costs with hours
• Indirect costs applied
• Fee calculation
• Cumulative cost report

Milestone/deliverable payments:

• Evidence of deliverable completion
• Government acceptance documentation
• Milestone achievement certification

Record retention:

Keep copies of all invoices and supporting documentation for at least 6 years (or contract requirement if longer).

Late payments:

• Interest accrues automatically per Prompt Payment Act
• Track payment timing
• Follow up with CO if payment is late
• Interest should be paid without requesting

Partial payments:

• Government may approve partial payment
• Remainder pending issue resolution
• Get clear explanation of shortfall
• Resolve and resubmit remaining amount

Disputed amounts:

• Government may dispute specific charges
• Request written explanation
• Provide additional documentation
• Escalate through CO if necessary

Payment holds:

• Various reasons: investigation, performance issues, contract disputes
• Understand the reason
• Work to resolve underlying issue
• May impact cash flow significantly

When to escalate:

• Payment significantly late with no explanation
• Repeated improper rejections
• Unreasonable documentation demands
• Pattern of payment issues