How to Invoice as a Web Developer

Web projects mix one-off build work with ongoing maintenance, so your invoicing usually spans both: milestone payments for the build and a recurring line for support or hosting. Structuring it clearly keeps clients comfortable and your cash flow smooth.

Milestones for the build

Break a fixed-price build into milestone payments — for example deposit, design sign-off, development complete, launch. Invoice each as the milestone is reached and reference the project and stage.

Maintenance and hosting

Bill ongoing maintenance as a monthly retainer (updates, backups, support hours). If you pass through hosting or third-party subscriptions, list them as separate lines, at cost or with an agreed markup.

Hourly work and terms

For ad-hoc changes outside a retainer, bill hourly with a short description per block. Keep terms short, take a deposit on new projects, and apply the right tax for your country (US sales tax varies by state for services; UK/AU/CA add VAT/GST once registered).

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Frequently asked questions

How should web developers bill fixed-price projects?

Split the fee into milestone payments (deposit, design sign-off, development complete, launch) and invoice each milestone as it’s reached. This keeps cash flow steady and reduces end-of-project risk.

How do I bill for website maintenance?

Use a monthly retainer covering updates, backups and a set number of support hours, with extra work billed separately. List pass-through hosting or subscriptions as their own lines.

Should developers take a deposit?

Yes, especially for new clients and fixed-price builds — a deposit commits the client and protects your time. Make it the first milestone on the invoice.