Contractors and service-based businesses have unique needs that standard invoicing tools often fail to meet. Effective contractor invoicing software must be capable of handling the nuances of project-based billing.

Essential features include:
- Milestone Billing: The ability to invoice for specific project milestones rather than a single lump sum.
- Retainer Management: Tracking hours or services against a pre-paid retainer.
- Detailed Time and Expense Tracking: Seamlessly importing time logs and receipts into the invoice.
- Progress Invoicing: Generating invoices based on the percentage of work completed.
A dedicated contractor invoicing software solution ensures that every hour and every expense is accurately captured and billed, maximizing profitability on all project-based billing.