Consulting firms have relatively simple expense structures but need robust tracking of time, projects, and client profitability. The key difference from other service businesses is that consultants sell expertise and hours, so the books need to show which engagements are actually worth the time invested.

Track time against projects and clients, even if you bill fixed fees. Hourly billing obviously requires accurate time records for invoicing. But fixed-fee work also needs time tracking to reveal whether your pricing makes sense. A $5,000 project that takes 60 hours is very different from one that takes 30 hours. Without tracking, you won’t know which types of engagements to pursue and which to avoid.

Set up your chart of accounts to show profitability by client or engagement type. Revenue should be trackable at the project level. If you bring in subcontractors or associates, their costs should connect to specific work. This is where many professional services businesses fall short. They know total revenue and total expenses but can’t identify which clients or project types generate healthy margins.

Accounts receivable management matters more in consulting than many industries. Net-30 invoices routinely stretch to net-60 or longer with corporate clients. Tracking aging receivables and following up systematically keeps cash flow steady instead of unpredictable.

Expense categorization is typically straightforward for consultants. Most costs fall into predictable buckets: software subscriptions, professional development, travel, client meals, workspace costs, and insurance. Consistent categorization makes tax time easier and reveals spending patterns you might want to adjust.

For firms with multiple consultants, track utilization rates. Utilization is billable hours divided by available hours. When team utilization drops, you’re paying salaries without generating matching revenue. This shows up clearly in your books if time tracking feeds into your accounting properly.

Handle retainers and prepayments carefully. A client’s upfront payment isn’t revenue until you deliver the work. Recording it as income immediately distorts profitability and may accelerate tax obligations. Set up a liability account to hold prepayments until earned.

Solo consultants often manage their own books with QuickBooks or similar software. Once revenue exceeds $200K or you add team members, the time spent on bookkeeping competes with billable work. A Detroit area bookkeeping service that understands consulting can set up your chart of accounts for project-based reporting and handle month-end close while you focus on client work.