£111M later, frictionless post-Brexit border dream 'brought to early closure'

The UK's long-promised "Single Trade Window" has quietly run out of steam after burning through more than £111 million ($150 million), with officials confirming the program has been "brought to early closure."

Freedom of Information (FOI) responses obtained by TaxWatch and shared with The Register suggest the flagship border digitization scheme is effectively on ice. HM Revenue & Customs says there are no staff working on the project and no spending on it this financial year, despite total costs reaching £111.44 million. The Treasury has gone further, saying the program was "brought to early closure," even as officials insist policy work continues somewhere in the background.

"The delivery of the Single Trade Window (STW) for the financial year 25/26 has been paused," the FOI response reads. "As a result, there are currently no HMRC staff assigned to the operational delivery of the STW programme, nor has any expenditure been incurred for its delivery during this period."

In a separate document seen by The Register, HMRC also confirmed the technical delivery contract, awarded to Deloitte, has been closed, another sign the program is effectively defunct despite years of promises that a one-stop digital portal for traders was just around the corner.

The STW was supposed to make import and export paperwork less of a slog by allowing businesses to submit data once rather than switching between government systems. Ministers long pitched it as a cornerstone of post-Brexit border modernization, part of the plan to build the "world's most effective border."

The government handed Deloitte the border technology contract in 2023, but the National Audit Office later warned HMRC it needed to be a stronger "intelligent client" when dealing with major suppliers - a warning the latest disclosures suggest didn't get much traction.

TaxWatch, an investigative think tank focused on tax compliance and policy, said the episode is a reminder of how messy large public sector IT projects can get - and why transparency matters when they do. In a post on Tuesday, the group noted that while HMRC remains remarkably efficient overall, collecting nearly £1 trillion in revenue last year at a cost of about £5.7 billion, big transformation projects still have a habit of going sideways.

"The UK's tax and customs administration remains amazing value for money," TaxWatch director Mike Lewis told The Register. "But it's also the case that most major projects, at HMRC and elsewhere, end up having costs and delivery times considerably greater than first envisaged. Contractors failing to deliver a key border project doesn't bode well at a time when HMRC is trying to tackle major challenges to trade taxation."

Businesses that had hoped the system would eventually smooth border processes and cut down on admin are unlikely to be thrilled, despite officials insisting the program has merely been paused and that policy development is ongoing. With no delivery staff, no active spending, and the main contract wrapped up, the reality looks a lot like a project that has slipped quietly into limbo.

"If there's no spending, no staff working on delivering the project operationally, and traders haven't been given any indication about when it's coming, then it's very difficult to read that as anything other than the project being cancelled," Lewis said.

The broader lesson, according to TaxWatch, is not that HMRC is failing, but that major digital transformations need clear accountability when they falter. The UK's tax and customs system underpins everything from public services to national defense, making it essential that the government learns from costly missteps rather than quietly moving on.

"Quietly shelving a key tax and trade project, while ministers continue to tell Parliament it's still on its way, prevents lessons being learned," Lewis concluded. ®