Work in Progress (WIP)
Standard definition, mathematical formula, practical agency calculation walkthrough, and 2026 benchmarks.
Core Definition
Work in Progress (WIP) is the accrued monetary value of billable hours and expenses logged by team members that have not yet been invoiced to client accounts.
Calculation Formula
Total WIP = ∑(Unbilled Billable Hours × Assigned Billing Rate) + Unbilled Reimbursable ExpensesReal-World Calculation Example
An agency team logs 240 billable hours across 5 active client projects over two weeks at an average rate of $150/hr ($36,000 in unbilled labor), plus $1,500 in incurred API fees.
Until invoices are generated and dispatched, $37,500 of company working capital is tied up in unbilled WIP inventory, creating cash flow exposure if billing is delayed.
Why This Metric Matters
Managing WIP inventory accelerates cash conversion cycles, prevents delayed billing disputes, and protects agency liquidity.
Accelerates Cash Flow Conversion
Unbilled WIP is effectively an interest-free loan to your clients. Billing WIP bi-weekly or upon milestone completion shortens days to cash collection.
Prevents End-of-Month Invoice Shock
Letting WIP accumulate over 60+ days leads to massive invoices that clients dispute, delaying payment and damaging relationships.
Accurate Accrual Financial Accounting
Under GAAP/accrual accounting, WIP represents earned revenue asset value that must be tracked alongside accounts receivable.
2026 Industry Benchmarks
Metric Comparisons
WIP represents unbilled earned labor (invoice not yet sent); AR represents sent invoices awaiting client payment.
DSO measures collection time after invoicing; WIP Aging measures how long earned hours sit unbilled before an invoice is issued.
Deferred revenue is cash collected upfront for unearned work (retainers); WIP is earned work that hasn't been invoiced yet.
In-Depth Practitioner Guide
Work in Progress (WIP) represents unbilled agency inventory. In manufacturing, inventory sits in a warehouse; in client services, inventory sits on timesheets. When agencies use high-density timesheet software, unbilled WIP is tracked automatically in real-time, allowing 1-click invoicing the moment work is completed.
Test different agency parameters and generate instant projections.
Frequently Asked Questions
The accrued monetary value of billable hours and expenses logged by team members that have not yet been invoiced to client accounts.
Work in Progress (WIP) is calculated using the formula: Total WIP = ∑(Unbilled Billable Hours × Assigned Billing Rate) + Unbilled Reimbursable Expenses. For example: An agency team logs 240 billable hours across 5 active client projects over two weeks at an average rate of $150/hr ($36,000 in unbilled labor), plus $1,500 in incurred API fees. Result: Total WIP Asset = (240 × $150) + $1,500 = $36,000 + $1,500 = $37,500 in unbilled WIP.
Managing WIP inventory accelerates cash conversion cycles, prevents delayed billing disputes, and protects agency liquidity.
Target: WIP should be converted to invoices within 7 to 14 days of work completion.. Warning: WIP aging beyond 30 days indicates bottlenecked billing processes or disputed milestones. Danger: WIP aging beyond 60 days carries a high probability of partial write-offs and client non-payment.
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