Business Tax- Zero Emissions Cars: Box 726 must not be completed box 30 after 1/4/2025 (and 1/4/2026)
Article ID
business-tax-zero-emissions-cars-box-726-must-not-be-completed-box-30-after-1-4-2025-and-1-4-2026
Article Name
Business Tax- Zero Emissions Cars: Box 726 must not be completed box 30 after 1/4/2025 (and 1/4/2026)
Created Date
2nd February 2026
Problem
Resolution
IRIS Business Tax is currently following the HMRC schema rules which is creating the error etc and we cannot change this until an update from HMRC. Also in the next HMRC schema the same message is also generated but with a 1/4/2026 date warning.
Therefore IRIS will be investigating new options to send allowances to a different box (Until HMRC formally make the change to their Schema). We shall be updating this KB once we have further news.
Workaround: If you need to urgently submit, then add the Car asset under code 523 (not under code 525 which is the issue) and tick option ‘qualifies for 100% FYA’. Add a note explaining this.
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