Web Developer Invoice Template
Invoice for development work, fixed-bid milestones or monthly retainers — formatted for clients and accountants alike.
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Invoice
How to invoice as a web developer
Web work gets billed three ways — hourly, by milestone, or on a monthly retainer — and the same client often spans all three. A clear invoice separates build work from ongoing maintenance so nobody confuses a one-off project with a recurring charge.
This template opens with typical development line items. Switch between hours and fixed amounts, add hosting or third-party costs as pass-through items, and export a PDF that itemises exactly what the client is paying for.
What to include
- Project or milestone name
- Development hours × rate, or a fixed milestone fee
- Hosting, domains or third-party services (pass-through)
- Maintenance / retainer for the period
- Purchase-order number if the client uses one
Typical terms: Net 30 · milestone payments due on sign-off
Frequently asked questions
How do I invoice for a retainer and project work together?
List the retainer as its own recurring line item and the project work as separate hourly or milestone lines. Keeping them apart on the invoice prevents the client from confusing a one-off build with the ongoing monthly charge.
Should I pass through hosting and third-party costs?
Yes — add hosting, domains or paid APIs as their own pass-through line items so it is clear those are reimbursed costs, not your labour. This template totals them into the invoice automatically.
Does the template support purchase-order numbers?
Yes — there is a field for a PO number, which many agencies and larger clients require before they can process payment.
Is this invoice generator free?
Yes — CalculatorAI's invoice generator is completely free. You can build, customise and download as many professional PDF invoices as you want, with no signup, no watermark and no trial limit. A free account simply adds extras like saved clients, invoice history and the Invoices Tracker.
Do I need an account or a credit card to make an invoice?
No. You can generate and download an invoice without an account and without entering any payment details. Signing up is free and unlocks saved client details, reusable invoices and payment tracking — but it is never required to create an invoice.
Track every invoice you send
Turn this template into a system. The Invoices Tracker keeps your clients, payment status and totals in one place — so you always know who has paid and what is overdue.
Open the Invoices Tracker