What E-Invoicing Actually Saves: The Published Evidence for Buyers and Suppliers
We went looking for published, sourced evidence that e-invoicing saves buyers and suppliers money. On the buyer side there is none — anywhere, and the analyst houses do not have it either. Here is the audit trail, 47 sources graded A to D.
Countries have run mandatory e-invoicing for a long time — Chile since 2003, Brazil since 2008, Korea since 2011, Mexico universally since 2014, Italy since 2019. Between them they have processed hundreds of billions of invoices. So what has actually been published, with sources, about what e-invoicing saved the businesses involved — separately, for buyers processing payables and suppliers issuing receivables?
Almost nothing. After tracing every figure we could find across Latin America, Europe, Asia-Pacific, the Middle East and Africa back to its originating document, we found no measured, post-implementation study of AP invoice processing cost, receipt-to-approval cycle time, exception rates or archiving effort attributable to an e-invoicing mandate — in any jurisdiction, at any level of rigour. Not a weak one. The category is empty.
The analyst houses do not have it either, and that surprised us. Forrester, Gartner, IDC, Hackett, Ardent Partners, Spend Matters and the Big Four are in the business of quantifying precisely this — so we checked all ten. There is a great deal of research in the neighbourhood, some of it very good, and not one study isolates e-invoicing exchange from the accounts-payable automation it sits inside. That includes the Forrester study widely circulated as proof of e-invoicing ROI, which turns out to be a repackaging of a 2022 tax-determination study that explicitly excluded the e-invoicing module.
What fills the gap does not survive being chased. The Australian per-invoice figures quoted across the Asia-Pacific are a shared sender-and-receiver estimate with an assumed 60/40 split, resting on a 2016 consultancy study that is not publicly available — and Deloitte's own current e-invoicing page recites those figures while attributing them to someone else. The European Commission's per-invoice savings are a labour-time valuation at an assumed hourly wage, for “automating the invoicing process”. Its larger per-cycle figure is footnoted, in a formal report to the European Parliament, to a technology news article about a 2013 study. Denmark's much-quoted savings claim exists in three mutually incompatible unsourced versions, in the wrong currency.
The tax-compliance research, by contrast, is genuinely excellent — peer-reviewed, causal, and consistent across Peru, Italy, Rwanda, Argentina, Ecuador, Uruguay and Mexico. It measures the state's revenue rather than a business's costs, and the difference matters: the European Commission's own impact assessment for ViDA puts €335.6bn of its €371.9bn modelled benefit in VAT collection, and €5.6bn — 1.5% — in e-invoicing itself.
This report is the audit trail. Every figure is traced to its origin, graded A to D, and where it does not survive the trace, we say so. It ends where the evidence points: measure your own baseline before you start, because the only defensible per-invoice numbers in your business case are yours.