Subcontractor Pay Application Review: The Systematic Way to Catch Errors Before They Become Payments
Subcontractor pay applications — typically on AIA G702 (summary) and G703 (schedule of values) forms or equivalent — are the primary payment request document in commercial construction. The sub submits their pay app claiming a specific percent complete by cost code, the resulting earned value, retainage withheld, and net payment requested. Most pay apps have 50-200 line items across trades. The review process determines whether the claim is accurate and appropriate to pay.
Pay app review done casually — a quick check of the total and sign-off — lets errors through. Those errors compound over a project's life: inflated percent complete that peaks at 100% before work is actually done, retainage miscalculations that the sub expects the GC to absorb, unapproved changes snuck into the billing, double-billed items, and miscalculated totals. Systematic review catches these before payment goes out; casual review catches them during disputes at closeout when correction is harder.
Start with line-by-line review of the schedule of values:
Line-by-line review elements
- Scheduled value — matches approved SOV and contract value
- Previous billing — matches last period's approved billing
- This period billing — new work claimed
- Total completed and stored to date — running total
- Percent complete — computed from total completed divided by scheduled value
- Balance to finish — scheduled value minus total completed
- Retainage — calculated on total completed per contract terms
Arithmetic errors happen. A sub line shows 45% complete but the math actually gives 48%. Or totals don't foot. Or the percent complete entered doesn't match the dollars claimed. Automated review catches these; manual review catches the obvious but may miss subtle cases.
The biggest subjective item is percent complete — and the most common source of overbilling:
Percent complete verification
- Site verification — walk the site, confirm the work is actually installed
- Photo evidence — recent photos supporting the claim
- Prior percent vs. current — reasonable progression given schedule
- Comparison to schedule — is percent complete consistent with schedule progress
- Comparison to labor hours — percent complete should correlate with cost incurred
- Industry benchmarks for the trade — what's reasonable at this project stage
Subs sometimes front-load billing — claim higher percent complete in early periods to improve cash flow. Front-loaded pay apps show unrealistic early progress followed by slower later progress. Catching front-loading early prevents the closeout crisis when the sub is 95% billed but only 80% done with months of work remaining.
A sub claiming 70% complete on structural steel when visual inspection shows only the first two floors of four are up is front-loading. The GC's review should catch the discrepancy and negotiate a realistic percent complete — or hold back the overage. Paying at face value means financing the sub's work through end of project.
Stored materials (materials delivered but not yet installed) have their own rules:
Stored materials verification
- Materials must be on-site or at approved off-site storage
- Stored off-site typically needs specific agreement and insurance
- Bill of sale transferring title to owner
- Insurance coverage for the stored materials
- Photo evidence and inventory verification
- Storage in proper conditions (climate protected if required)
- Not included in percent complete until installed
Stored materials claims deserve scrutiny. Materials stored off-site at the sub's warehouse for months before installation create risks (theft, damage, vendor financial failure). Verifying inventory and storage conditions protects the owner from stored materials claims that can't be fulfilled.
Change orders add to contract value and show up in pay apps:
Change order review in pay app
- Each change order has its own SOV line
- Change order must be fully approved before billing
- Pending change orders not billable (usually)
- Change order percent complete tracked separately
- Unapproved work billed at the sub's risk
Subs sometimes bill for unapproved changes, hoping the GC doesn't notice. Pay app review should confirm that every line item corresponds to an approved contract amount — original SOV or executed change order. Unapproved work doesn't belong in the pay app.
Retainage math is specific:
Retainage calculation review
- Retainage rate — typically 5% or 10% per contract
- Retainage applied to total work completed (not just this period)
- Retainage less previously held — net retainage this period
- Retainage release on milestones (substantial completion, specific phases)
- Stored materials retainage — sometimes different rate
- Change order retainage — same rate as base contract, typically
Retainage errors often favor the sub (withheld less than contract requires). Over the project life, small errors compound. Verifying retainage on every pay app catches the errors before they accumulate.
Lien waivers should match pay apps:
Lien waiver / pay app matching
- Previous unconditional waiver matches previous period payment
- Current conditional waiver covers this period payment amount
- Through-date on waivers matches pay app period
- All parties who worked during the period have waivers submitted
- Lower-tier waivers where flow-down required
Missing or defective waivers should delay payment until provided. A pay app approved without required waivers creates lien risk that's hard to unwind later.
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Sub Compliance Status
Beyond the pay app itself, sub compliance affects payment eligibility:
Sub compliance check
- Current COI on file
- W-9 on file
- Preliminary notice / NTO in place (state-specific)
- Certified payroll current (prevailing wage projects)
- Safety compliance (no open OSHA issues)
- Back charges — deducted if applicable
Payment gates on compliance items hold the pay app until items are current. A sub with expired COI shouldn't be paid until renewed; the gate in the AP system enforces this.
Site-level verification supports office-level review:
Field verification workflow
- Pay app received by PM and superintendent
- Superintendent walks the work verifying percent complete
- Adjustments negotiated with sub if disagreements
- PM signs off with documented adjustments
- Approved pay app forwarded to AP
- AP performs arithmetic, compliance, and waiver verification
- Payment approved and issued
Field and office verification catch different issues. Field verifies physical progress; office verifies paperwork completeness. Skipping either leaves a gap — field-only misses compliance and paperwork; office-only misses physical progress reality.
Back charges — amounts owed by the sub to the GC — get netted against pay:
Back charge handling
- Documented back charges with supporting evidence
- Sub notified and given opportunity to dispute before deduction
- Deduction clearly identified on payment
- Backup retained in case of later dispute
- Types — damage to work by sub, sub's share of cleanup, materials provided by others on sub's behalf
Back charges that surprise the sub at payment time create disputes. Contractual notice requirements for back charges, followed consistently, reduce disputes and maintain productive sub relationships.
Disagreements over pay apps need process:
Pay app dispute resolution
- Sub submits, GC reviews, finds items for adjustment
- GC communicates proposed adjustments with reasoning
- Sub accepts or provides additional information
- Continuing disagreement escalates — PM to sub's owner, possibly legal
- Partial payment for agreed amounts while disputed amounts resolved
- Documentation for potential later dispute
Partial payment on agreed amounts maintains cash flow for sub on undisputed work while disputed items are resolved. Holding the entire pay app over a small disputed amount damages the relationship and provides little additional leverage.
Subcontractor pay application review is where systematic practice produces material financial protection. Line-by-line arithmetic verification, percent complete ground-truthing, stored materials validation, change order inclusion verification, retainage calculation review, lien waiver matching, sub compliance status checking, and field-and-office coordination all contribute to catching errors before payment. GCs with disciplined pay app review rarely have payment-related closeout disputes; GCs with casual review frequently do. The discipline adds modest time per pay app — time that pays for itself many times over by preventing the front-loaded billings, unapproved changes, and other issues that would otherwise require unwinding later. Pay app review is a protective operational practice that every construction AP function should take seriously.
Written by
Sarah Blake
Head of Product
Former AP Manager at a $200M construction firm, now leads product at Covinly. Writes about what AP teams actually need from automation — beyond the marketing promises.
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