Buying guideInvoicing & payments
Contractor Invoicing Software: From Approved Estimate to Paid Invoice
How small contractors invoice by progress, handle retainage and turn approved estimates into invoices without re-entering the same work.
Contractor invoicing software turns approved estimates into invoices, bills projects in stages, tracks retainage and change orders, and collects payment. For small contractors, the biggest gain is removing retyping: the price the customer approved should flow into the job and then the invoice, so nothing is lost or billed twice.
This guide follows the path from approved estimate to paid invoice, with templates for progress billing, change orders and retainage. It’s part of our job costing series; for trade-specific detail, see our guide to electrical contractor invoicing software.
From approved estimate to paid invoice
| Stage | What should happen | What goes wrong without software |
|---|---|---|
| Estimate approved | Signed estimate becomes the contract value | Approved price lives in an email |
| Job created | Scope, schedule and budget copied from the estimate | Crew works from a different version |
| Changes | Change orders approved and added to the contract | Extra work done but never billed |
| Billing | Invoice per job or per progress stage | Stages billed late or twice |
| Retainage | Held amount tracked, released at the end | Retainage forgotten |
| Payment | Online payment, reminders for overdue invoices | Chasing payments by phone |
Contractor billing software: the features that matter
- Estimate-to-invoice conversion without retyping.
- Deposits at approval for material-heavy jobs.
- Progress invoicing by percentage, milestone or schedule of values.
- Change orders that update the contract value.
- Retainage held per invoice and released at the end.
- Online payments and automatic reminders.
- Accounting sync so invoices and payments reach your books.
What vendors publish, checked October 28, 2026:
- Jobber lists quotes, invoicing with online payments and progress invoicing; its Core plan (1 user) is $49 monthly or $21/month billed annually.
- Knowify lists progress billing, AIA pay applications (G702/G703) with retainage tracking, change orders and QuickBooks Online sync on all plans.
- QuickBooks Online is a common accounting destination; Plus lists project profitability tracking.
Contractor invoice app: what to check on a phone
Many small contractors invoice from the truck. A good contractor invoice app lets you:
- Create an invoice from the job with materials added on site.
- Attach photos of completed work.
- Take a card payment or send a payment link.
- See which invoices are overdue.
Test this on your own phone during a trial, with a real job’s details changed.
Progress billing spreadsheet template (Excel)
For a few projects a year, a spreadsheet can work. One sheet per project:
| Line item | Scheduled value | Previously billed | This period | Total to date | % complete | Balance to finish | Retainage |
|---|
Formulas: total to date = previously billed + this period; % complete = total to date ÷ scheduled value; balance = scheduled value − total to date; retainage = total to date × retainage %. Add approved change orders as new lines with their own scheduled value.
Hypothetical example: a $40,000 kitchen remodel billed in three stages (40%, 40%, 20%) with 5% retainage. Stage 1 bills $16,000 and holds $800; the customer pays $15,200. After all three stages, $40,000 is billed, $38,000 collected and $2,000 retainage is due at final acceptance.
How to invoice change orders
Change orders are where small contractors lose the most money: the work gets done but the paperwork doesn’t.
- Write it before doing it. Describe the change, the price and the schedule impact.
- Get approval in writing (a signature or approved link) before starting the work, unless it’s an emergency and your contract allows otherwise.
- Add it to the contract value as its own line.
- Bill it in the next progress invoice or as a separate invoice, as your contract specifies.
- Track cost against it in job costing, so you know if change orders are profitable.
| CO # | Date | Description | Price | Approved by | Approved on | Billed on invoice # |
|---|
Retainage tracking spreadsheet
Track retainage across all projects on one sheet:
| Project | Customer | Retainage % | Held to date | Release condition | Expected release | Requested | Received |
|---|
Review it monthly. Request release as soon as the conditions are met; many contracts require closeout documents first.
Service call invoice template with materials
For short service jobs, the invoice is simpler but should still be clear:
| Section | Content |
|---|---|
| Header | Business, license number if required in your state, invoice #, date |
| Customer and site | Name, address |
| Work performed | Plain-language description |
| Labor | Flat-rate task or hours × rate |
| Materials | Item, quantity, unit price |
| Fees | Trip or diagnostic fee if any |
| Tax | Per your state and local rules |
| Total and terms | Due date, payment methods |
Seasonal contract billing
Some contractors bill service contracts by season, for example landscaping maintenance billed monthly over a season or snow contracts billed in installments. The same principles apply: one contract value, a billing schedule, and a running balance. A spreadsheet with columns for contract, schedule, invoiced and paid works for a few contracts; recurring invoicing in software is better for many.
Frequently asked questions
What’s the best software contractor invoice option for a solo contractor? One that converts quotes to invoices on a phone and takes payment on site. Progress billing matters only if you bill in stages.
Do I need AIA billing? Only if your contracts require AIA G702/G703 pay applications, which is common with general contractors on commercial work.
How do invoices connect to job costing? Invoices are the revenue side of each job. Compare them with costs in our job costing guide or, for construction, our construction job costing guide.
How do I reduce late payments? Clear terms on the estimate, deposits for material-heavy jobs, online payment links and automatic reminders.
Sources
- Jobber pricing and plans, Jobber (accessed October 28, 2026)
- Knowify pricing, Knowify (accessed October 28, 2026)
- QuickBooks Online plans and pricing, Intuit (accessed October 28, 2026)
How we researched this
This article is based on documentation research, including the sources listed above. We have not run hands-on tests of specific products for this piece. Read our research methodology. Spotted an error? See our corrections policy.