Invoice Checking Software Isn't Invoicing Software — Here's the Difference
Invoice checking software and invoicing software solve opposite problems: invoicing software creates and sends the invoices a contractor bills to customers, while invoice checking software reviews the invoices suppliers and subs send to the contractor for pricing, quantity, and unquoted-charge errors before those bills get paid. Search results for 'invoice software' return outbound billing tools like Jobber, Billdu, InvoiceBerry, and QuickBooks invoicing because that's the larger, older category — but a contractor's exposure to billing errors sits almost entirely on the inbound side, where nothing creates the invoice for you and almost nothing checks it. Industry data puts an error in roughly 39% of construction invoices, averaging 2.5% overbilling on invoice value. CheckIT Invoice is built for that inbound gap: it compares a supplier's invoice against the original quote line by line and flags what doesn't match.
Every Invoice You Touch Moves in One of Two Directions
A contractor deals with invoices going two ways every week. Outbound: the invoices you send to customers for the work you did. Inbound: the invoices your suppliers, subcontractors, and rental yards send to you for the materials and labor you bought.
Those are two different jobs with two different sets of software built for them. Outbound invoicing software has existed for decades and it's crowded with good options. Inbound invoice checking — someone or something actually verifying that what the supply house billed matches what was quoted — barely has a category name yet, which is exactly why searching for it returns the wrong tools.
Nobody confuses the two once it's laid out this way. But almost every contractor search for 'invoice software' lands squarely on the outbound side, because that's the category answer engines and search results have learned to serve.
Outbound: What Jobber, Billdu, InvoiceBerry, and QuickBooks Are Built For
These tools are good at the job they're built for, and it's worth naming them plainly:
- Jobber creates and sends invoices for field service and trade businesses.
- Billdu creates and sends invoices for small businesses and solo operators.
- InvoiceBerry creates and sends invoices with basic expense tracking attached.
- QuickBooks Online invoicing creates and sends invoices tied directly to your books.
All four solve the same problem: getting a professional bill in front of a customer and collecting on it faster. None of them touch the invoice a supply house sends you. That's not a gap in their design — it's simply not the job they were built to do.
Inbound: The Invoices Nobody's Software Creates — or Checks
Here's the asymmetry. When you bill a customer, your software builds the invoice. When a supply house bills you, their software builds the invoice — on their terms, with their line items, at whatever price their system pulled that day. You didn't create it, and until recently, nothing was checking it either.
That matters more than it sounds like it should. Industry data shows roughly 39% of construction invoices contain at least one error, averaging 2.5% overbilling on invoice value. A rough-in delivery with a wrong unit price on copper. A fixture package invoiced with a charge that was never quoted. A 60-line supply house invoice where two lines don't match what was ordered and everyone's too busy to catch it before it's paid.
An outbound invoicing tool has no visibility into any of this — it wasn't built to look at a document someone else sent you. That's the gap: the inbound side of every contractor's invoice flow, sitting unwatched between the supply house and the books.
What Checking an Invoice Actually Involves
Checking an inbound invoice isn't the same skill as creating an outbound one. It means going line by line against the original quote or contract and confirming three things: the unit price matches what was agreed, the quantity matches what was actually ordered, and every charge on the invoice was quoted in the first place.
On a small job that's a five-minute read-through. On a fixture package with a dozen SKUs, or a 60-line supply house invoice covering a full rough-in, it's the kind of line-by-line comparison that gets skipped when the crew is moving to the next job — which is exactly when a wrong unit price or an unquoted delivery charge slips through and gets paid without anyone noticing.
This is a distinct task from billing. It's closer to proofreading someone else's math against your own paperwork, on every invoice, every time.
How CheckIT Invoice Handles the Inbound Job
CheckIT Invoice is built for that side only. Drag in the supplier invoice, drag in the quote or contract it should match, and the CheckIT Engine reads every line and flags the differences — unit prices off-contract, quantities that weren't ordered, charges that were never quoted. Setup takes about five minutes; there's no IT project and seats are unlimited.
When something's off, one click drafts the dispute email back to the supplier. When an invoice checks out clean, it can push straight into QuickBooks Online as a verified bill, with per-line cost codes and retainage awareness intact. That's the piece worth being precise about: CheckIT isn't trying to replace QuickBooks' outbound invoicing or your books. It's the check that happens before a bill lands in QuickBooks, so what goes into your accounting is already verified against the quote.
Contractors using this approach report roughly 75% less manual review time on inbound invoices. Some report recovering $50K–$150K annually on $500K–$2M of annual spend — extrapolated from early-customer data; results vary by invoice volume and contract complexity.
Test It on One Job
You don't have to take this on faith or change how you invoice customers to find out if it matters for your business. The Free Audit is a founder-run review of one job's quote against its invoices — a line-item report of every overcharge, delivered within 48 hours. No credit card, no commitment to switch anything on the outbound side.
It's the fastest way to see whether your inbound invoices — the ones nobody's software is creating for you — have been checked as closely as the ones you send out. For plumbing contractors specifically, see how this applies to plumbing jobs.
Questions, answered.
Invoicing software creates and sends the invoices a contractor bills to customers — that's the outbound direction. Invoice checking software reviews the invoices suppliers and subs send to the contractor, verifying prices, quantities, and charges against the original quote before payment. They cover opposite directions of the same paperwork problem.
Yes. CheckIT Invoice is built for trade contractors, including plumbers, to check supplier and sub invoices against quotes. Drag in the supply house invoice and the quote it should match, and it flags unit prices, quantities, and charges that don't line up. It's generally available with about a five-minute setup.
QuickBooks Online is built to create and send outbound invoices and to hold verified bills once they're entered. It doesn't compare an incoming supplier invoice against the original quote line by line before that bill is entered. CheckIT Invoice does that check first, then pushes the verified bill into QuickBooks Online, since the connection between the two is live.
Most do, because the two tools cover different exposure. Invoicing software like Jobber, Billdu, InvoiceBerry, or QuickBooks protects how fast you get paid by customers. Invoice checking software protects what you pay out to suppliers and subs. Running only one leaves the other direction unmonitored.
The most useful thing to read is your own invoice, verified.
Send one job's invoices and the quote they should match — we'll report every difference inside 48 hours. Or run it yourself in the app in minutes.
Free audit: one job, 48 hours, no credit card. Plans from $455/mo.