Guide · Accounts payable
Construction accounts payable,
explained for builders.
Accounts payable is where most builders lose their evenings. This guide explains how AP actually works on a building company, where it goes wrong, and the workflow that makes it stop being a nightly job.
01 / The basics
In plain English
Accounts payable (AP) is simply the process of paying the people you owe, your suppliers and subcontractors. On a building company that means handling a constant stream of supplier invoices: receiving them, checking them against what you ordered, coding them to the right job and cost code, approving them, and paying them.
It sounds straightforward. In practice it’s the admin that eats a builder’s nights, because the volume is high, the invoices arrive in every format imaginable, and every one has to land against the correct job for your cost tracking to mean anything.
The pieces of a construction AP process
- Capture: getting the invoice into your system, however it arrives.
- Matching: checking the invoice against the purchase order you raised.
- Coding: assigning it to the right job and cost code.
- Approval: someone with authority signing it off to pay.
- Sync to accounting: getting it into Xero so the books are right.
02 / The reality
Where builders get stuck
Manual data entry
Every invoice keyed into Xero by hand, usually after hours. It’s slow, it’s dull, and it’s where mistakes creep in.
No PO matching
Without matching invoices to purchase orders, over-charges and wrong quantities get paid because nobody caught them.
Miscoded jobs
An invoice coded to the wrong job quietly corrupts your cost tracking. You only find out when the numbers stop making sense.
Approval bottlenecks
Invoices sit waiting for the one person who can approve them, who’s on site all day with a shoebox of paper.
Lagging costs
If invoices are processed in a month-end batch, your cost reports are always weeks behind the actual spend.
Double entry
Typing the same invoice into a job system and then into Xero doubles the work and the error rate.
03 / The fix
A workflow that holds up
- 01
Raise POs up front
Commit cost through purchase orders so there’s something to match invoices against later.
- 02
Centralise capture
Route every supplier invoice to one place instead of scattered inboxes and paper.
- 03
Match to the PO
Check each invoice against its purchase order before it’s approved, to catch over-charges here.
- 04
Code to the job
Assign the invoice to the right job and cost code at capture, not as an afterthought.
- 05
Approve quickly
Make approval possible from a phone so it doesn’t bottleneck on one person at a desk.
- 06
Sync to Xero
Push approved bills to accounting once, with tracking categories, so there’s no double entry.
04 / The tooling
How software helps
Good AP software removes the manual steps without removing your control. The biggest win is at capture: instead of reading an invoice and typing it in, software can extract the line items for you. The next win is matching: software can line the invoice up against the purchase order automatically and flag anything that doesn’t agree.
From there, coding to the job, routing for approval, and syncing to your accounting platform can all happen in one flow. You move from doing the work to checking the work, which is both faster and more accurate, and it means your cost tracking is current instead of weeks behind.
05 / In practice
Where VIABUILD fits
VIABUILD does AP the way builders need it.
VIABUILD gives you a dedicated accounts inbox. Suppliers email invoices there (or you forward them), and the AI extracts the line items, matches them to your purchase order, and codes them to the job, ready for you to approve from your phone. Approved bills push to Xero as drafts with tracking categories.
The result is the nightly admin shift, gone: you approve a clean queue instead of keying invoices after dinner, and your cost tracking updates in real time.
- Dedicated accounts inbox
- AI line-item extraction
- Automatic PO matching
- Job coding at capture
- One-tap approval anywhere
- Draft bills to Xero
06 / FAQ
Common questions.
Accounts payable is the process of paying your suppliers and subcontractors: capturing their invoices, matching them to purchase orders, coding them to the right job, approving them, and recording them in your accounting system. In construction the volume and the need to code every invoice to a job make it especially time-consuming.
Often by hand: receiving invoices in scattered inboxes or on paper, then keying each one into Xero after hours and coding it to a job. It works, but it’s slow, error-prone, and leaves cost reporting weeks behind actual spend.
PO matching checks that what you’re being billed agrees with what you ordered. It catches over-charges and wrong quantities before they’re paid, and it keeps your committed-vs-actual cost picture accurate.
VIABUILD gives you a dedicated accounts inbox where the AI extracts invoice line items, matches them to your POs, and codes them to the job, so you approve a clean queue instead of typing invoices in. Approved bills then sync to Xero with tracking categories.
07 / Keep reading
Related guides & features
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