Dandelaion

HMRC · pre deployment

VAT Assist

"The service compares data added to a customers tax return against information HMRC holds for that customer to provide incisive feedback to help customers submit accurate tax returns."

Publicly known

  • Owner: HMRC
  • Vendor: Approved HMRC third party suppliers

Undisclosed

  • Model architecture
  • Model performance benchmarks
  • Training data provenance

Who is actually being paid

Approved HMRC third party suppliers

Role

Third party suppliers are used for deployment of risk packages in to the live environment. Analysis of risks and insight are all developed by civil servants

Procurement procedure

The Restricted event procurement procedure is used, as it would be a direct award under the SAS professional services agreement

Data access terms

All third parties must have sufficient HMRC security clearance

No Companies House number in the record.

Source: ATRS record · last updated Wed Sep 09 2026