Finance leaders face e-invoicing deadline risk

Many UK businesses remain far less prepared for mandatory e-invoicing than they appear to believe, according to Basware, which says compliance failures are already interfering with international expansion and exposing weaknesses in day-to-day finance operations. With the UK moving towards a 2029 mandate for structured VAT e-invoicing, the company argues that invoice compliance can no longer be treated as a back-office detail.

Its Beyond the Checkbox: Compliance as Strategy research, conducted with FT Longitude among 400 global finance leaders, found that 56% said compliance failures had already prevented overseas expansion. More than a third, 36%, said their organisations had incurred fines because of incorrect tax audits, while 39% said invoices had been rejected due to tax or invoicing compliance errors. Those are not edge cases. They point to operational weaknesses that can slow growth, complicate supplier relationships, and raise the cost of doing business across borders.

The policy direction in the UK is now firm enough to make those weaknesses harder to ignore. HMRC’s proposed move to mandatory e-invoicing for VAT-registered businesses will replace PDF and paper-based invoicing with structured electronic formats, with further detail expected later this year. Even before the full implementation route is finalised, finance teams are facing a narrowing window in which to assess systems, supplier readiness, and process design without being forced into rushed remediation later.

Basware’s own invoice analysis shows how much ground remains to cover. Across 272 million invoices, the company found that 57% still arrive globally in PDF or paper form. That may look digital on the surface, but PDFs often preserve manual handling under a new wrapper. Data still needs to be extracted, validated, reconciled, and checked for errors, which leaves finance teams carrying compliance risk inside workflows that appear more modern than they really are.

Abigail Myers-Antiaye, Vice President of Global Compliance at Basware, said: “UK businesses are significantly underestimating what this shift means, with PDF, email and paper still being widely used as a common invoicing method. Many finance teams are effectively building compliance risks into their day-to-day operations. As e-invoicing becomes mandatory, this is no longer a future concern, but a present-day readiness gap, which will directly impact operational continuity, cross-border trade, and growth opportunities if left unaddressed.”

Visibility sits at the centre of the problem. Basware says 91% of finance leaders now view visibility as a major operational risk, and that finding is easy to understand. When businesses cannot see clearly across the full invoice lifecycle, they are slower to catch tax errors, weaker at managing exceptions, and more exposed to fraud or reporting failures. Poor visibility also makes it harder to prove control under audit, especially where processes run across multiple entities, systems, and jurisdictions.

That pressure has been building across compliance more broadly. In recent coverage of compliance as a competitive edge, the argument was that stronger control disciplines increasingly help businesses move faster rather than simply satisfy regulators. E-invoicing fits that pattern. The same architecture that reduces tax and audit risk can also improve approval speed, supplier confidence, and the quality of data flowing into planning and cash management.

Early preparation is likely to separate the businesses that treat the 2029 mandate as an upgrade from those that encounter it as disruption. Organisations that use the lead time well can redesign invoice flows, reduce manual intervention, and strengthen interoperability across finance systems before compliance pressure peaks. Those that delay are more likely to face compressed implementations, supplier friction, and new workarounds introduced simply to stay operational.

The challenge is also broader than invoice format alone. Moving to structured e-invoicing touches master data, controls, ERP configuration, supplier onboarding, fraud prevention, and the quality of reporting across the finance function. Businesses that still treat invoicing as an isolated accounts payable issue may find that they have underestimated both the scale of the transition and the strategic value of getting it right.

Basware is urging finance teams to start that process earlier and more deliberately. Organisations wanting to benchmark their own exposure can access the company’s Beyond the Checkbox: Compliance as Strategy research, which sets out the scale of the readiness gap and the operational consequences already attached to it.