Professional Invoices & Proposals for Software Developers

A development invoice should clearly list the work delivered — whether that is a feature, sprint, or milestone. Include a brief description of what was built, the agreed rate, and any additional costs for scope changes or infrastructure.

Always include your business details, invoice number, payment terms, and bank details. If your client requires a purchase order number, add a reference field. For the full breakdown, see our invoicing guide.

OwnedWork generates professional invoices in seconds, so you can get back to what you do best — writing code.

Scope creep is the biggest threat to profitability on development projects. The solution is a clear change request process: when the client asks for something outside the original spec, you document it, price it, and get approval before building it.

OwnedWork makes this easy. Create a supplementary invoice or add change request line items to your next milestone invoice. Each change is clearly labelled so the client can see the original scope and additions separately.

Best practice: Include a change request clause in your proposal. Define your hourly rate for additional work and the process for approving changes. This sets expectations from the start.