What it means
For non-finance managers, understanding Work in Process is vital for managing cash flow and operational efficiency. When a company purchases raw materials, those supplies have an initial cost.
As soon as production begins, those costs shift into the WIP account. This includes the value of the raw parts, the wages of the staff working on them, and a proportion of factory overheads like rent and utilities.
Until the product is fully finished and ready for sale, these expenses remain trapped inside the production line. Monitoring WIP helps business leaders spot bottlenecks in the manufacturing process.
If the WIP balance grows too large, it usually means items are getting stuck, which ties up valuable cash that could be used elsewhere. Conversely, a very low WIP might indicate that the production line is starving for materials or that the team is finishing goods faster than new orders arrive, risking future stockouts.
On the balance sheet, WIP is grouped under current assets. Accountants calculate its value at the end of each reporting period to ensure the financial statements accurately reflect the true worth of the company.
For managers, keeping a close eye on this metric ensures a smooth flow from raw inputs to revenue-generating sales, preventing capital from sitting idle on the factory floor. Work in Process is like a meal half-cooked on the kitchen stove.
You have already bought the ingredients and spent time chopping and stirring, but you cannot serve it to guests or collect payment until it is fully finished and plated.
In practice
Real-world examples
Example 1
A bespoke bicycle builder has ten custom frames currently on the welding jigs. The raw steel, specialised components, and hours of artisan labour spent so far total $12,000, all recorded as WIP. When the frames are finished and moved to the showroom, that $12,000 moves out of WIP into finished goods.
Example 2
A regional bakery prepares large batches of frozen dough ahead of the weekend rush. At close of business on Friday, 500 unbaked loaves sit in the provers, representing $800 in WIP. That works out at $1.60 of flour, labour and oven time per loaf so far.
Example 3
A boutique furniture maker has five dining tables in the finishing room undergoing sanding and oiling. The timber and craftsmanship invested to date equal $6,500 in WIP value, or $1,300 per table. The owner counts these tables in the month-end stock valuation, even though none can yet be sold.
Think of it
Work in Process is like a meal half-cooked on the kitchen stove. You have already bought the ingredients and spent time chopping and stirring, but you cannot serve it to guests or collect payment until it is fully finished and plated.
Formula
Calculation
Beginning WIP + Manufacturing Costs (Direct Materials + Direct Labour + Factory Overhead) - Cost of Goods Manufactured = Ending WIP.
Example: if you start the month with $10,000 in WIP, add $25,000 in new manufacturing costs, and transfer $30,000 of finished goods to inventory, your ending WIP is $10,000 + $25,000 - $30,000 = $5,000.
Partly finished items are valued by how much of the work is done. Suppose 400 chairs are on the line, all with materials fully added at $30 each, but only 50% of the labour and overhead (the conversion cost, set at $40 per chair when finished). Materials are 400 x $30 = $12,000 and conversion is 400 x 50% x $40 = $8,000, so WIP is $20,000.Case study
Seen in the real world
This is a fictional, illustrative scenario. Apex Manufacturing, a medium-sized producer of office chairs, noticed that its cash flow was tightening despite steady sales. The finance director decided to investigate the production floor and discovered a massive accumulation of Work in Process. Thousands of chair frames were sitting half-assembled because a specific type of castor wheel was out of stock, halting final completion. By identifying this bottleneck, management realised that capital was trapped in incomplete items that could not be sold.
They renegotiated with suppliers to secure a reliable stream of castor wheels and implemented a strict limit on how many unfinished frames could be started at once. Within two months, the WIP balance dropped significantly, releasing $40,000 in trapped cash back into the business and speeding up the overall delivery time for customers. The finance director now reports the WIP balance in the weekly management pack, next to sales and cash. A sudden rise in WIP with flat sales is treated as an early warning sign, and the production manager must explain it within the week.
Watch out
Common mistakes
- Failing to update WIP values regularly, which leads to inaccurate monthly financial reports.
- Confusing Work in Process with finished goods, resulting in miscalculated inventory valuations.
- Ignoring the overhead costs when calculating the total value tied up in incomplete production.
Questions
People also ask
What is the difference between WIP and finished goods?
WIP refers to items currently on the production line that are not yet ready for sale. Finished goods are completed products sitting in inventory, ready to be shipped to customers.
Is WIP considered an asset or a liability?
WIP is considered a current asset because it holds economic value and will eventually be converted into cash when the finished product is sold.
Why does a high WIP balance sometimes indicate a problem?
A high WIP balance often signals a production bottleneck, meaning items are getting stuck midway through manufacturing, which ties up cash and slows down order fulfilment.