Why you can trust this page
- Last reviewed
- October 17, 2026
- Pricing checked
- October 11, 2026
- Evidence basis
- Primary vendor documentation and published pricing; not hands-on tested
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Project billing is the point where the work you promised becomes an accurate charge. A good system should make it obvious what was approved, what was delivered, what has been billed, and what remains unpaid. This guide compares the workflow for consultants, agencies and project-based service teams, using published vendor documentation rather than claiming hands-on testing.
Project billing evaluation
A project billing demo should include one revision and one partial payment
Projects rarely finish exactly as first scoped. Evaluate how the software tracks billable work, approved variations, deposits and revenue across the engagement.
Time and materials
Check whether billable hours and expenses flow to invoices with their original descriptions and rates.
Milestones
Test deposits, partial settlement, progress billing and final invoicing without creating duplicate charges.
Change control
Record who approved a scope amendment and whether the invoice can reference it.
What to check before choosing
- Trace the lifecycle: quote → approve → work → change order → invoice → part payment.
- Keep client communication visible: check what the portal reveals and whether payment instructions are clear.
- Export clean records: see what happens when the accountant needs an aging or WIP report.
Invoice Ninja documents project and time-tracking features on its plans page. Check the plan you intend to use before migration.
Review Invoice Ninja projects →
Primary documentation checked October 25, 2026: Invoice Ninja plans, client portal. Vendor plans and terms may change.
Project billing software: compare the workflow first
| Decision point | Invoice Ninja | BillingNow |
|---|---|---|
| Best-fitting work | Billable time, tasks, project expenses and invoices | Client engagements with linked estimates, invoices, credits and payments |
| Project organization | Projects, tasks, billable-hour budgets and Kanban-style workflow documented | Project records, statuses, activity timeline and linked financial documents documented |
| Built-in time tracking | Yes; timed tasks can become invoice items | Not established by the reviewed project documentation; verify before buying |
| Quotes / estimates | Quotes and approval-to-invoice workflow | Estimates can be converted to invoices |
| Starting plan snapshot | Free hosted plan with five clients; Pro $14/month for one user | $9.99/month; three-day free trial |
Vendor-published information reviewed October 11, 2026. Pricing, feature permissions and country availability can change. This table is not a hands-on performance comparison.
Choose by how you calculate the invoice
Time and tasks determine the amount
Start with Invoice Ninja when people log work by task or client. Its project documentation covers task timers, custom rates, billable expenses and conversion to invoices. Test corrections to previously logged time before choosing.
Explore Invoice Ninja projects →Approval and payment status matter most
Consider BillingNow when the project is already managed in another tool and the financial handoff is the central need. Its documented project workspace links estimates, invoices, credit notes and payments to an engagement.
Explore BillingNow →A realistic project-to-invoice example
Imagine a design agency with an approved $3,000 website project: 40% at kickoff, 40% after design approval, and 20% on handoff. The agency also has a separately approved $250 change request.
- Start from the agreement. Record the scope, three payment milestones and who approves each stage; avoid treating an informal estimate as an approved invoice.
- Track what triggers billing. If the contract is time-based, log hours against a specific task. If it is milestone-based, record the sign-off and amount independently of any time log.
- Issue the right document. Link the approved estimate or project to the invoice and distinguish the original work from the change request.
- Handle partial settlement. Record the $1,200 kickoff payment without incorrectly marking the entire $3,000 project as settled.
- Reconcile the final handoff. Verify remaining invoice balances, approved credits, taxes and document exports with the accountant.
The best tool is the one that keeps all five steps understandable to the client and the person preparing the books. If the software forces manual spreadsheet reconciliation between tasks and invoices, that cost belongs in your decision.
Features worth testing in a trial
Work-to-invoice audit trail
Can an invoice line be traced back to a specific project, approved task, milestone or cost? Test an edited scope item and see whether the source record remains visible.
Different billing models
Run a fixed-fee engagement and an hourly engagement. Check minimum billable units, rounding, retainers, expenses and multiple invoice schedules.
Approvals and exceptions
Ask someone other than the creator to approve a quote. Revise one invoice, issue a credit, and check whether team access and the edit history are adequate.
Customer-facing experience
Send a test PDF or payment link. The customer should understand completed work, deposits, outstanding balances and what to do next without an explanatory email.
Where invoicing software stops
A project-billing page should not imply that every invoice tool can replace project management. Resource allocation, dependency planning, detailed job costing, portfolio schedules and approval routing vary widely. The BillingNow Projects help center documents a financial-engagement view; Invoice Ninja documents more task and time-tracking capabilities. If you need dispatch, work orders or field-service workflows, first check whether a specialized operational platform is required.
Project billing FAQ
Can I bill a project without tracking hours?
Yes. For a fixed-fee engagement, milestones, acceptance criteria and deposits may matter more than a timer. Make sure the tool supports the invoice schedule and adjustment process in your contract.
Is project billing the same as project management?
No. Project billing focuses on translating approved work into invoices and payments. Project management additionally handles scheduling, task dependencies, ownership and delivery coordination.
Which option is more suitable for a time-based consultancy?
Invoice Ninja documents task-level time tracking and invoicing from tracked work, making it a relevant starting point. Confirm plan entitlements, team permissions and reporting with your own sample project.
Source documentation and methodology
This is a vendor-documentation research comparison, not a claim that InvoiceVerdict has personally tested or benchmarked these tools. Sources checked on October 11, 2026: Invoice Ninja projects and time tracking, Invoice Ninja pricing notice, BillingNow Projects documentation and BillingNow published plans. Read our editorial methodology and correction policy.
Translate project delivery into a billable event
Check whether time sheets, approved milestones, retainers, change orders, partial invoices and expense reimbursements have an auditable path to each client invoice.
Buyer research note: compare vendors using their current official documentation and your own trial. No hands-on product testing is claimed here. Search volume and difficulty are internal editorial planning metrics, not product ratings.
Related buying decision: consultant billing workflow
Update history
- Expanded original-blueprint draft into a vendor-sourced buyer guide with decision scenarios, trade-offs, and structured internal links.
- Initial publication and editorial review.