Forum Discussion
One simple approach is to track costs by job as they happen rather than waiting until the job is completed.
For each job, I would separate costs into a few basic categories: labor, materials, subcontractors, and other expenses. Then compare the total actual cost against the original estimate and target margin.
For materials, having techs record the job number on every receipt is a good system. The important part is entering those costs regularly, so you can see cost overruns while the job is still in progress.
I also find it useful to track change orders and customer payments separately. That gives you a much clearer picture of estimated vs. actual cost, cost variance, and projected final profit.
A simple spreadsheet can work well for this if you don't want to add another complicated system.