If you plan to enter time for a Job Costing System this most probably should be integrated with your payroll, otherwise monumental data duplication might occur. A good job costing system is not limited to payroll and takes into account all costs, some of which are processed at the main office, such as major purchases, payment of invoices and so on. Your accounting system should be able to provide you with the data without duplication of effort. The site provides them with the raw data they return you the processed.

Biometric clocks will be of great help to prevent fraud but will not be able to tell you about the per hour distribution of cost codes accounts. Recognize their limits but if available, use them.

The sample above is from a particular accounting vendor, you must search for solutions that best suits your accounting and financial systems.

The following paper summarizes how we at home manage Job Costing as an integral part of our accounting system. It tracks time and costs using accepted accounting standards, is auditable. Hope it can be of help.

http://rapidshare.com/files/269181396/Job_Costing_for_Construction.pdf

Job costing for labor only does not make much sense as emphasis on labor at the expense of equipment and material costs can backfire on your total costs.

Best regards,
Rafael