Tech Invoice Template

Free Technical Consultant Invoice Template

Create professional technical consultant invoices in minutes. Track hours, milestones, and third-party costs and get paid on time.

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What is a Technical Consultant invoice?

A technical consultant invoice is a billing document for software development, engineering, or IT services. It details hours worked, project milestones, technology stack, and fees. A professional invoice helps tech professionals maintain accurate records and collect payment on time.

What to include on a Technical Consultant invoice

Common technical consultant invoice line items

Service Typical Rate Unit
Technical Consultant Services $75 - $250 per hour
Project Development $1,000 - $20,000 per project
Technical Consultation $100 - $250 per hour
Code Review $75 - $150 per hour
Maintenance Retainer $500 - $2,000 per month
Hosting and Infrastructure at cost pass-through

How to invoice as a technical consultant

Define the project scope, tech stack, and deliverables in a written agreement before any code is written. For larger projects, break work into milestones and invoice at each milestone rather than at project completion. Track all hours carefully and use descriptive line items so the client can see what was built. Pass through third-party costs (hosting, APIs, software licenses) at cost or with a small markup. For ongoing maintenance, set up a monthly retainer. Send invoices promptly at each milestone or at the end of each billing period. Follow up on overdue invoices within 48 hours.

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Frequently asked questions

What should a technical consultant invoice include?
Include your business details, client details, invoice number, project name, an itemized list of tasks or milestones completed, hours worked, hourly or project rate, any third-party costs passed through, the total amount due, and payment terms.
Should I charge hourly or per project as a technical consultant?
Project-based pricing works well when scope is clearly defined. Hourly billing suits ongoing work or projects where requirements may change. Many developers use a hybrid: a fixed project fee with an hourly rate for work outside the original scope.
How should I invoice for third-party costs like hosting or APIs?
Pass through third-party costs as separate line items on the invoice, noting the vendor and amount. You can charge at cost or add a small markup (10-20%) to cover administration time. Keep receipts to back up your charges if questioned.
How do I structure a retainer invoice for maintenance work?
A retainer invoice should state the number of hours included per month, the hourly rate, and the total retainer fee. List any hours used in the prior period and note whether unused hours roll over. Send retainer invoices at the start of each billing period.
How do I handle scope creep on my invoice?
Track all out-of-scope requests and log the time spent on them separately. Document scope changes in writing before doing the work. Invoice for change requests as separate line items referencing the change order or ticket number.
Can I use this template for free?
Yes. Tidybill's free plan includes professional invoice templates, up to 5 clients, and 5 invoices per month. No credit card required. Upgrade to Starter for time tracking, recurring invoices, and automated reminders.
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