Job Costing and Project Profitability for Construction Contractors

Most contractors do not lose money on the jobs they know are bad. They lose it on jobs that look fine on the schedule and only settle up at the end, by which point the crew has moved on and there is nothing left to fix.

These episodes are about the numbers that tell you sooner. What a WIP schedule is really saying, why underbilling drains cash while your P&L looks healthy, how to run cost to complete honestly, and which accounting method for long-term contracts leaves the most money in the business.

Episodes in this series

• Bidding Work That Loses Money · Episode 189
• The Estimating Fudge Factor · Episode 152
• Cost to Complete · Episode 168
• The Underbilling Mistake · Episode 139
• The WIP Report and Percentage Complete · Episode 155
• Your WIP Schedule, Taxes and Bonding · Episode 176
• Completed Contract Method vs Cash Basis · Episode 166
• Completed Contract Method for Multifamily · Episode 183
• Modular Construction Job Costing · Episode 163
• Modular Construction and the Cash Curve · Episode 184
• Leading and Lagging Indicators · Episode 136
• Profit vs Cash · Episode 126
• Reading the Income Statement · Episode 103
• Profit First for Contractors · Episode 90
• Busy But Broke · Episode 177
• The Data Center Construction Boom · Episode 181
• Best Construction Project Management Software · Episode 23
• How Long to Keep Tax Records · Episode 64

Start here if your P&L and your bank account disagree

The most common version of this problem: the income statement says the year was profitable, the account says otherwise, and nobody can explain the gap. It is almost always timing. Revenue recognised on progress, cash collected on retainage, and costs that hit before the billing does.

The fastest diagnosis is the WIP schedule, because it is the only report that shows earned revenue against billed revenue job by job. Underbilling shows up there before it shows up anywhere else.

Then get the estimate honest

A job that loses money usually lost it at the bid. Contingency buried as a percentage on the bottom line hides which line items are actually wrong, so the same mistake gets repeated on the next three bids. Breaking that habit is worth more than any deduction on this site.

Then pick the right tax method

If your contracts cross a year end, the accounting method you use for tax is a real lever, not an administrative detail. A 2025 law change widened who can use the completed contract method, and the residential rules in particular changed in contractors’ favour.

Browse the full Construction Accounting Podcast archive

General information about how these rules work, not advice for your situation. Tax law changes and the right answer depends on your entity, your income and your circumstances. Talk to a CPA before acting on it.