Invoice Format for Plumbers & Electricians (Field Service Template)

Field service work is different from office-based billing — you're often invoicing on-site, right after finishing a job, sometimes with materials and labor billed separately. Here's the invoice format that works best for plumbers, electricians, and other field technicians, and how to generate one on your phone.

What a Field Service Invoice Needs

Unlike a simple service invoice, field work usually needs to separate a few things clearly:

• Labor charges — hours worked or a flat call-out fee
• Materials/parts used — itemized separately from labor, since customers want to see what they paid for
• Call-out or visit charge, if you charge one
• Emergency/after-hours rate, if applicable
• GST or tax, calculated on the total
• Job/site address, especially useful if you invoice the same customer for multiple properties

Sample Line-Item Structure

A clean field service invoice typically lists:

• Call-out fee — flat rate
• Labor — hours × rate
• Materials — each part with quantity and unit price
• Subtotal, tax, and total

Keeping labor and materials on separate lines avoids disputes and makes it easy for the customer to see exactly what they're paying for.

How to Create the Invoice On-Site

• Open Simple Invoice Maker on your phone — it works in any mobile browser, no app install required.
• Add the customer's name and site address.
• Add line items for call-out, labor, and materials separately.
• Apply GST/tax — the total is calculated automatically.
• Download the PDF and send it via WhatsApp or email before you leave the site.

If you're regularly working in areas with poor signal, the Android app can create and save invoices offline, so you can hand over or send the bill as soon as you're back online.

Why Invoicing On-Site Matters

Sending the invoice before you leave — rather than "I'll email it later" — measurably improves payment speed. Customers pay faster when the amount is fresh and the invoice is in front of them, and it avoids the admin backlog of invoicing a dozen jobs at the end of the week.

FAQ

Do I need to separate labor and materials on the invoice?

It's not legally required in most cases, but it's strongly recommended — customers trust itemized invoices more and it reduces payment disputes.

Can I add a call-out or emergency fee as a line item?

Yes — add it as its own line item just like labor or materials so it's clearly visible on the invoice.

Can I invoice from my phone at the customer's location?

Yes, the generator works fully in a mobile browser, and the Android app supports offline invoice creation for low-signal job sites.

Is GST/tax calculated automatically?

Yes — set your tax rate once and it applies to the line items and total automatically.

Create your field service invoice now — free, works on your phone, no signup required.