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Invoicing

Learn how to invoice clients faster, get paid on time, and manage your invoicing workflow as a contractor or tradesperson.

Guides & Articles

Invoice vs Estimate — What's the Difference

An estimate is what you send before the job. An invoice is what you send after. Here’s when to use each, what to include, and how to convert one to the other in a single tap.

How to Write a Contractor Invoice

A step-by-step breakdown of what belongs on a contractor invoice — invoice numbers, line items, payment terms, and how to send it the same day the job is done.

Free Tools

Invoice Generator

Free online invoice generator for contractors. Create and download a professional invoice PDF in minutes, no signup required.

Invoice Templates

Free invoice templates for contractors and tradespeople. Professional format for every trade, download as PDF or generate online.

Painting Invoice Template

Free painting invoice template for painters and painting contractors. Professional format for interior, exterior, and commercial paint jobs.

Roofing Invoice Template

Free roofing invoice template for roofing contractors. Includes fields for materials, labor, disposal, and deposit tracking.

HVAC Invoice Template

Free HVAC invoice template for HVAC contractors and technicians. Professional format with fields for parts, labor, and service calls.

Electrical Invoice Template

Free electrical invoice template for electricians and electrical contractors. Professional format, download as PDF or use the online generator.

Plumbing Invoice Template

Free plumbing invoice template for plumbers and plumbing contractors. Professional format, download as PDF or use the online generator.

The app does the work. The guides explain why.

BIG INVOICE is free to download. Start invoicing from your phone while you build your business knowledge.

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