The #1 Reason Contractors Lose Money: Broken Job Costing Systems

The #1 Reason Contractors Lose Money: Broken Job Costing Systems

Job costing serves as the strongest predictor of contractor profitability. When systems fail or are absent, projects appear successful until they're not. This guide explains how job costing breaks down, solutions to fix it, and how to build systems that maintain profitability year-round.

1. The Hidden Problem With Job Costing Today

Most contractors believe they're job costing—but they're only categorizing expenses. Without standardized cost codes, accurate labor allocation, or real-time tracking, you never see a job's true health until the project nears completion and funds are spent.

2. How Bad Coding Destroys Job Profit

Poor coding equals poor reporting. When materials, subs, equipment, and labor aren't coded to the correct job or phase, your P&L becomes inaccurate. You lose not just precision but the ability to maintain a profitable production schedule.

3. The Fix — QBO Projects + Standardized Cost Codes

Salisbury Bookkeeping fixes job costing by:

• Turning on QBO Projects
• Standardizing cost codes by phase (labor, subs, materials, equipment, overhead)
• Setting rules so cost codes are ALWAYS applied
• Mapping items to services for clean reporting
• Enforcing coding at the PO and bill-entry levels

This creates consistent, predictable job cost data every time.

4. Why WIP Reporting Matters More Than Month-End Reports

Month-end P&Ls only tell you what happened, not what's happening. WIP reporting reveals:

• Percent complete
• Profit fade
• Overbilling / underbilling
• Labor inefficiencies
• Upcoming cash constraints

This approach helps contractors catch problems early instead of losing margins late.

5. The KPIs Every Contractor Should Track

• Actual vs. budget cost variance
• Committed cost and open POs
• Over/under billing
• Labor efficiency
• Projected final margin
• Backlog and pipeline value

Conclusion

Contractors who master job costing master profitability. Those who don't gamble. Salisbury Bookkeeping provides a system you can trust.