High-volume statement reconciliation means matching hundreds of supplier statements a month against the ledger, a process that breaks down fast when it's done by hand. Open ECX automates the matching, converts every statement format into one structure, and only surfaces genuine discrepancies, so AP teams handle growth without adding headcount.
When reconciliation stops being a monthly job
At a few dozen supplier statements a month, reconciliation is annoying but manageable. Someone ticks off the easy matches, chases the rest, and gets on with their day.
At 500 statements a month, that same process doesn't bend, it breaks. The spreadsheet gets bigger, the VLOOKUPs get slower, and the whole thing starts to depend on whoever built it in the first place. Growth that should be good news for finance turns into a queue that never clears.
Why manual matching doesn't scale
Manual reconciliation is linear by design. Match more statements and you need more hours, more eyes, or more people. There's no shortcut built into a spreadsheet, so every extra supplier, branch, or acquisition adds straight onto the workload.
Three things make this worse at volume:
Format chaos. Every supplier sends statements differently: PDF, CSV, scanned paper, a portal export. At ten suppliers you can live with that. At 550 suppliers, which is NMBS's number and not a typo, nobody's standardising formats fast enough to keep up.
Multiple ERPs and entities. Growth through acquisition often means more than one back-office system running side by side, each with its own version of the ledger. NG Bailey ran COINS and IFS together, and manual reconciliation across both quickly turned into a backlog.
Threshold creep. Checking every statement line by line isn't realistic by hand, so plenty of manual processes only kick in above a set value. NG Bailey's reconciliation only applied to payments over £5,000, sensible until you remember what adds up below that line.
None of this is about anyone doing a bad job. It's what happens when a process built for tens of suppliers gets asked to handle hundreds.
What manual reconciliation costs at volume
The hours add up fast. NMBS processes over 200,000 invoices and 1,300 statements across 550 suppliers every month. Precon's finance team spent three full days a week reconciling statements, matching line by line. Direct Heating & Plumbing relied on one person doing VLOOKUPs by hand, because that was the only way anyone trusted the numbers for their larger suppliers.
That's not just lost time, it's lost margin. A member of staff on a £60,000 salary costs about as much as the margin on a £2m contract. Every hour they spend matching line items by hand is an hour not spent chasing the credit notes, duplicate payments, and missed rebates that manual reconciliation is most likely to miss. (For the full commercial case, see our piece on the benefits of automated statement reconciliation.)
And the risk compounds with volume. UK late payments already cost the economy an estimated £11 billion a year, with large businesses still paying 15% of invoices late in 2025 (Small Business Commissioner). A reconciliation process that buries a discrepancy for weeks doesn't just slow one payment, it adds to that number. More statements means more chances for a discrepancy to slip through unnoticed, more suppliers chasing payment status because nobody's flagged an issue yet, and more pressure riding on whoever holds the process in their head when they're on leave, or leave the business altogether.
What changes when matching becomes automatic
At high volume, the fix isn't more hours, it's taking matching off the list of things that need a human at all. A good high-volume reconciliation process has three things a spreadsheet never will. (For the mechanics of reconciling supplier statements step by step, see our guide on how supplier statement matching works.)
Exception-only workload. Clean matches clear themselves. The team only sees the statements with a genuine discrepancy, which turns a queue of hundreds into a shortlist of the few that need a decision.
One format in, one format out. Whatever a supplier sends, PDF, CSV, EDI, paper, the system converts it into one standard structure before matching starts. Volume of suppliers stops being volume of formats to manage.
A record that doesn't live in one person's head. The process logs every match, query, and resolution automatically, so reconciliation isn't dependent on whoever built the spreadsheet. Anyone on the team can pick it up, which matters more as volume grows, not less.
Done well, this doesn't just handle today's statement count. It handles the one you'll have after the next acquisition, the next new region, or the next quarter of organic growth, without anyone needing to hire to keep up.
How Open ECX handles it at scale
Automated statement reconciliation is built to close exactly this gap, and it's what our Statement Reconciliation solution does for high-volume teams. We automate the capture and processing of supplier statements, match invoices and credit notes against the ledger automatically, and flag only what doesn't match. Your team spends its time on judgement calls, not data entry.
It's built for the volumes that break spreadsheets. NMBS runs Statement Reconciliation across 550 suppliers, 1,300 statements, and over 200,000 invoices a month. Rex Nye, their Digital Director, expects it to cut processing time in half. Precon went from three full days a week reconciling statements to half an hour.
We're also part of a community of 17,000+ businesses already trading through Open ECX, so a good chunk of your supplier base may already be connected before you've onboarded a single one of them. Our platform plugs straight into your existing ERP too: no disruption, no lengthy integration project, and set up in weeks, not months.
We log every match and query automatically, giving you a running audit trail without anyone having to build one by hand, and external auditors can get read-only access when they need it.
Ready to see what it looks like at your volume
If reconciliation got harder as you grew rather than easier, that's the surest sign a spreadsheet was never going to be the long-term answer.
Head to our Statement Reconciliation Guide for the full walkthrough of how automated matching works, or see the complete commercial case on our Statement Reconciliation product page. Curious what it looks like at a similar scale to yours? Read how NMBS reconciles 1,300 statements a month, or book a demo and we'll show you what it'd look like running on your numbers.
