Estimate vs Invoice: What's the Difference and When to Send Each

1. What is an Estimate?

An estimate is an educated projection of what a job will cost. It gives the client an expected price range before work begins. It is typically non-binding and allows for adjustments if unexpected complications arise (such as corroded pipes behind a wall or hidden electrical code violations).

When to send an estimate:

• Before you begin any work or order expensive supplies.
• When you need client sign-off on the scope of work.
• When the job has unknown variables that could affect labor time.

2. What is an Invoice?

An invoice is an official bill and payment request for work that has been completed (or for a scheduled deposit). It outlines the final breakdown of materials, labor hours, tax, and the due date.

When to send an invoice:

• Immediately upon finishing the job, before packing up your van.
• When requesting an agreed-upon initial deposit before starting a large project.
• At agreed project milestones for multi-week installations.

3. The Golden Rule: Never Re-Type Job Details

The most common mistake contractors make is typing the job details into an estimate program, and then re-entering everything into an invoicing program once the work is done. This creates errors and wastes valuable hours.

Always use a tool that connects quotes to bills. In Invoice for Trades, every estimate has a 1-tap "Convert to Invoice" button that duplicates all customer info, line items, and parts directly into the final bill.

Need to Calculate Job Pricing?

Try our interactive Free Contractor Estimate Calculator to check your labor rates and material markup instantly.