Work in Progress (WIP)

WIP (Work in Progress) is the value of services delivered to clients but not yet billed or recognized as revenue, recorded on the balance sheet as a current asset until an invoice is raised or revenue is formally recognized. Unlike a product in a warehouse, services WIP can expire: the older it gets, the harder it is to collect.

How WIP builds

Every hour a consultant logs against a client engagement that has not yet been invoiced adds to WIP. On a time-and-materials project, WIP grows daily and clears when an invoice is raised. On a fixed-fee project, WIP builds until a billing milestone is hit or percentage-of-completion accounting is applied.

WIP balance = Delivered value not yet billed or recognized

Why it matters

WIP is the gap between work done and cash received. A firm can show strong utilization rate and healthy backlog while quietly accumulating WIP that will never convert to cash. This is how profitable-looking firms run into cash flow crises: the income statement looks fine, but the balance sheet is piling up unbilled work.

Common causes of WIP accumulation

• Infrequent billing cycles on monthly or milestone-heavy contracts
• Late or missing time entries that delay invoicing
• Scope completed but invoices on hold pending client approval
• Fixed-fee projects where the team over-delivers before the next milestone

WIP vs. accounts receivable

WIP is pre-invoice. Accounts receivable is post-invoice, money owed after the bill is sent. Both represent uncollected cash, but WIP is harder to see because it lives in the project ledger, not the invoice ledger. WIP aging reports disaggregate the WIP balance by how long each portion has been outstanding, making write-off risk visible before it reaches the income statement.

Managing WIP levels

Three levers reduce WIP accumulation. First, billing frequency: weekly or bi-weekly invoice cycles on time-and-materials work keep WIP from growing large between invoices. Second, time-entry discipline: hours entered the day they are worked can be invoiced immediately; hours entered weeks later sit in WIP and delay cash collection. Third, milestone structure on fixed-fee work: tightly spaced billing milestones tied to accepted deliverables prevent WIP from building while the team waits for the next contractual trigger.

A write-off occurs when a WIP balance is removed from the balance sheet without generating an invoice, recording the delivered value as a cost rather than revenue. Frequent or large write-offs are a signal that WIP is not being managed actively enough during delivery.