Work-in-progress accounting tracks the costs and revenue on jobs that haven’t finished yet. For contractors working on projects that span weeks or months, this solves a fundamental problem. Without WIP tracking, your books look terrible during construction because you’re recording costs with no revenue. Then when you get paid, all the revenue hits at once and you look artificially profitable. Neither picture is accurate.

The basic concept is matching revenue to the period when work actually gets done. If you’re 60% through a $100,000 project and you’ve spent $42,000 in costs so far, WIP accounting lets you recognize roughly $60,000 in revenue this period rather than waiting until the job completes to record anything. This gives you an accurate picture of how you’re actually performing.

Contractors typically use one of two methods. Percentage of completion recognizes revenue based on how far along you are, usually measured by costs incurred divided by total estimated costs. If you’ve spent half the projected costs, you recognize half the contract revenue. Completed contract waits until the job is done to recognize any revenue, which is simpler but makes your financials lumpy and hard to interpret during longer projects.

This matters beyond just accurate bookkeeping. Banks and bonding companies review your financial statements when you apply for loans or increase your bonding capacity. If your income statement shows a loss because you’re mid-project on three big jobs, they don’t see the revenue coming. WIP-adjusted financials show your true position. On the tax side, the timing of revenue recognition affects when you owe taxes, which can shift significant amounts between years.

You can’t do WIP accounting without solid job costing. If you don’t know your costs by project, there’s no way to calculate percentage complete or match costs to revenue. Every labor hour, material purchase, and subcontractor invoice needs to be tracked to specific jobs before WIP calculations mean anything.

Not every contractor needs formal WIP adjustments. If your jobs typically complete within a few weeks, the timing distortion is minimal. But if you’re running projects that span multiple months, especially if you’re seeking financing or preparing financials for a bonding company, WIP accounting gives you statements that actually reflect reality. Los Angeles QuickBooks bookkeepers who work with contractors can help you determine whether WIP reporting makes sense for your business and set up the tracking systems to support it.