Codium Logo Codium Logo
  • Services
  • Industries
  • Our Work
  • About
  • Blog
Blog · Construction

Why do supplier bills keep going missing on construction jobs?

A bill turns up on site, in a text message, in the accounts inbox or in the glovebox. Three months later the job is closed and the margin is wrong. This is where bills go missing and what builders do about it.

21 May 2026

If you ask a builder where the supplier bills are, you will usually get a list of places rather than an answer. Some are in the accounts inbox. Some were handed to the site supervisor and are still in the ute. A subcontractor texted a photo of one. A few made it into Xero but were coded to the wrong job. The rest will surface when the supplier chases them, which tends to happen after the client has paid the final claim and the job has been written up as profitable.

This is not a sign of a disorganised business. It is what happens when a process that worked fine with two jobs on the go is being used to run eight.

Where bills actually fall through

When we sit down with a builder and map how a bill moves through the business, the same gaps show up almost every time.

  • The bill goes to whoever ordered the material. That is usually the supervisor on site, who has no easy way to log it and is busy running the job. So it waits.
  • The office cannot tell which job it belongs to. The docket says "Smith" and there are two Smith jobs on the books. Someone guesses, or codes it to overheads to sort out later.
  • Approval happens over the phone. Before the bill is paid, the supervisor needs to confirm the materials arrived and the quantity was right. That conversation might happen, but nothing records that it did.
  • The job is costed before the bills stop arriving. The final claim goes out when the work finishes. Anything that lands afterwards comes straight off the margin.

Process changes that help

You can close most of these gaps without touching your software. These changes cost nothing except the discipline to keep them up.

  • One address for bills. Give every supplier and subcontractor a single accounts email and insist they use it. Anything sent elsewhere has to be forwarded to that address by the person who received it, before the end of the day.
  • Job number on every order. If the purchase order has the job number on it, the bill usually will too. Most suppliers will go along with "no order number, no payment" once you have told them.
  • Hold the final claim until the bills are in. Keep a list of open orders for each job. Do not close the job until each order has a bill against it or has been written off.

These will get a two-job builder comfortably to four jobs. They stop being enough when someone in the office is spending every Friday matching dockets to orders, and the supervisors are forwarding emails from the couch at night.

What it looks like when the software handles it

Builders who have stopped losing bills have stopped relying on people to carry them around. The bill arrives, the system reads it, works out which job and which order it relates to, and sends it to the right person to approve on their phone. Once approved, it goes into accounting coded to the job. The job's cost report is always current, so the margin you see is the margin you actually have.

That is how bill processing works in JACK, the construction platform we built with a builder. Supplier and subcontractor bills are read automatically, pre-filled against the job and sent for approval, with a two-way sync to Xero so the accounts team never handles the same bill twice. Estimating, job management and the cashflow forecast run off the same data, which is why the forecast is accurate. It already knows what has been committed on every job.

You do not need a whole platform to fix this. If you already run jobs in one system and accounts in Xero, the piece in between can be built so bills move from site to approval to accounting on their own. It is usually a smaller project than builders expect. The hard part is working out exactly where your bills go missing today, and that is the first thing we do together.

If you are chasing bills across inboxes, text messages and the ute, have a look at what we build for construction, or tell us where the admin piles up and we will talk it through.

Construction 2026
Keep reading

More from the blog

Has your business outgrown Excel? Seven signs, and what to do about each one
15 Oct 2026

Has your business outgrown Excel? Seven signs, and what to do about each one

Spreadsheets fail slowly, so nobody notices the day they stop being a tool and start being the system. Here are the signs, the fix...

What has changed in custom software development over the last 12 months
2 Sep 2026

What has changed in custom software development over the last 12 months

Software development continues to evolve quickly, but the last 12 months have seen some particularly significant changes in the wa...

How do you know which asset is about to fail before it does?
30 Jul 2026

How do you know which asset is about to fail before it does?

The failure was there in the data for three inspections before the breakdown. Nobody could see it because the data was spread acro...

All articles

Want to talk about your own project?

Tell us what's slowing your business down. One of our digital strategists will talk it through with you.

Get in touch Call 1300 887 103
Codium Logo
Codium Pty Ltd.
Ground Floor, 207 Greenhill Road
Eastwood, 5063
Adelaide, South Australia
  • 1300 887 103
  • sales@codium.com.au

Development

  • Software Development
  • Mobile Apps
  • Software Integration
  • Hardware Integration
  • Microsoft Access
  • Replace Spreadsheets

Managed Services

  • Software Takeover
  • Software Support (SLA)
  • Managed Hosting
  • Private AI Hosting
  • On-Premise AI

AI

  • AI for Business
  • AI Reporting

Strategy

  • Technology Partner
  • UI / UX Design
  • Due Diligence (M&A)
  • Why Projects Succeed
  • What Software Costs

Technologies

  • PHP · Laravel
  • JavaScript · Vue.js
  • AWS

Company

  • About Us
  • Industries
  • Our Work
  • Blog
  • Careers
  • Contact Us
  • Customer Feedback
  • Remote Support

© Codium Pty Ltd. All Rights Reserved.

  • Terms of Business
  • Privacy Policy
  • Quality Policy
  • Security Policy
  • Customer Experience Charter
Back Top
Codium
Services
All services Strategy
  • Technology Partner
  • UI / UX Design
  • Technology Due Diligence
  • Why Projects Succeed
  • What Software Costs
Development
  • Software Development
  • Mobile App Development
  • Software Integration
  • Hardware Integration
  • Microsoft Access Databases
  • Replace Spreadsheets
Managed services
  • Software Takeover
  • Software Support (SLA)
  • Managed Hosting
  • Private AI Hosting
  • On-Premise AI
AI
  • AI for Business
  • AI Reporting
Industries
All industries
  • Construction
  • Finance
  • Government
  • Health
  • Insurance
  • Manufacturing
  • Mining
  • Retail & E-commerce
  • Transport & Logistics
Our Work About Blog
Get in touch Call 1300 887 103