Best Invoice Software for Contractors (2026)

If you’re a contractor, the invoice is the last step between finishing a job and getting paid — so the software you use to send it matters more than most people think. The right tool gets you paid faster and makes your business look established. The wrong one has you typing invoices into a spreadsheet at 9pm.

This guide covers what actually matters in contractor invoice software, and how to send a professional invoice in under a minute.

What to look for in contractor invoice software

Not every invoicing app is built for trades. Here’s what genuinely matters when you’re on the tools:

1. Quote, then invoice — without retyping. You quote most jobs before you do them. Good software lets you send a quote the client approves online, then turn that approved quote into an invoice in one tap, so the line items carry across. No double entry.

2. Itemised labour and materials. Contractor jobs aren’t one line. You need to list labour, materials, plant or equipment, and callout fees separately — each with its own quantity and price — so the client sees exactly what they’re paying for.

3. Card payments built in. Chasing bank transfers kills cash flow. The best apps attach a card payment link to every invoice so the client pays from their phone and the invoice marks itself paid.

4. Works from your phone. You’re on site, not at a desk. Mobile-first software means you quote, invoice, and get paid without going back to the office.

5. Correct tax for your country. GST, VAT, HST, or US sales tax should be calculated automatically once you set your rate — not something you work out by hand each time.

6. A professional, branded look. A clean PDF with your business name, tax number, and logo is the difference between looking like a real business and looking like a side hustle.

How to send a contractor invoice in under a minute

With a mobile-first app like Spanner, the flow is:

Quote the job. Add the client, then list your line items — labour and materials. Send the quote by link; the client approves it online from any device, no app required.
Convert to an invoice. Once approved, turn the quote into an invoice in one tap. Share it via WhatsApp, email, or as a PDF.
Get paid by card. Generate a Stripe payment link on the invoice. The client taps, pays by card, and you’re notified the moment it clears.

That’s it — quote to paid, from your phone, while you’re still on site.

What about deposits and progress payments?

Larger contractor and construction jobs aren’t paid in one shot. Today, the practical approach in most apps — Spanner included — is to issue a separate invoice for each stage: a deposit invoice up front, then progress invoices as the work is completed, each with its own card payment link. Built-in progress-claim billing against a single contract total is a feature still being added across the category, so if that’s central to how you bill, check where each tool stands. For most contractors, stage-by-stage invoicing covers it.

Why contractors choose Spanner

Spanner is a free invoice app built for tradies and contractors:

Quotes clients approve online, then convert to invoices in one tap
Labour + materials line items, with quick-add chips for your common items
Stripe card payments on every invoice
Job photos for variations, sign-off, and your records
Automatic tax for AU, US, UK, NZ, and CA
Professional branded PDFs with your logo

It’s free to download, with up to 5 invoices and quotes on the free plan. If you do mostly building work, there’s a dedicated rundown of construction invoicing features too.

Frequently asked questions

What is the best invoice software for contractors? The best contractor invoice software lets you quote a job, convert the quote to an invoice, itemise labour and materials, and collect payment by card — ideally from your phone on site. Spanner does all of this and is free to start.

Can I send a contractor invoice from my phone? Yes. Mobile-first apps like Spanner let you create, send, and get paid on an invoice directly from your phone — you can have it in the client’s inbox before you leave the site.

How do I handle deposits or progress payments as a contractor? Today, the simplest approach in most apps is to issue a separate invoice for each stage — a deposit invoice up front, then progress invoices as work is completed — each with its own payment link. Dedicated progress-claim billing against a single contract total is a feature some tools are still adding.

Is there free invoice software for contractors? Yes. Spanner is free to download and lets you send up to 5 invoices and quotes combined on the free plan, with card payments included. Paid plans remove the limit and add your logo.

See Spanner’s contractor invoicing features or download free — no credit card required.