Engineering firms live and die by accurate time and expense tracking. When your revenue comes from billing for professional hours, losing track of time spent on projects means revenue walking out the door.

The foundation is a time tracking system that every team member uses consistently. This could be dedicated software like Harvest, Toggl, or Clockify, or time tracking built into project management tools. Some firms use their accounting software’s built-in time tracking. The specific tool matters less than whether everyone logs time daily and assigns it to the correct project.

Daily logging is critical. Engineers who try to recreate their week on Friday afternoon consistently underreport their hours by 10 to 20 percent. Make time entry part of the daily routine, not an afterthought. Even fifteen minutes of forgotten time per day adds up to significant unbilled revenue over a year.

Set up your time tracking with enough detail to be useful. Create projects for each client engagement. Within projects, create task categories that match how you bill, such as design, review, meetings, site visits, and revisions. Different staff levels often bill at different rates, so your system needs to capture who worked on what.

Expense tracking requires similar discipline. Project-related expenses like printing, travel, software licenses, or subconsultant fees need to be coded to the specific project. When you incur costs on behalf of a client, capture the receipt and assign it immediately. Waiting means forgetting which project the expense belongs to. Receipt scanning apps like Dext or Hubdoc pull documentation directly into your accounting software.

In your accounting software, every project should be set up as a job or customer sub-job. When time gets logged, it flows into the system with the project code attached. When expenses hit your credit card or bank account, they get coded to the project too. This creates a complete picture of what you’ve invested in each engagement.

The payoff is profitability analysis by project. You can see which jobs made money and which ate up more hours than you quoted. That insight helps you quote better next time or identify scope creep while you can still address it with the client. Professional services firms that don’t track at the project level often discover too late that their most demanding clients are also their least profitable.

Most engineering firms bill monthly or at project milestones. Your time and expense tracking becomes the basis for invoices. Good systems let you pull unbilled time and expenses into invoice drafts, review them for accuracy, and send them to clients without recreating everything manually.

If tracking feels like a burden, your systems probably need work. The right setup makes logging time quick and captures expenses automatically through bank feeds. As a medical billing service in Macomb that expanded into full bookkeeping, we’ve seen how proper system configuration makes the difference between tracking that takes minutes and tracking that feels impossible. A bookkeeper who understands professional services can set up your QuickBooks to match how you actually work, making compliance with your own tracking requirements much easier.