CBAM Deep Briefing — Steel #2: Default vs Verified Data

One filing decision can permanently lock you into the more expensive number — with no way back. This briefing covers Schedule 17's no-amendment rule in full: why HMRC's default values are deliberately built to cost more, why steel is more exposed to the gap than most sectors, and the exact timing you need to get verified supplier data in before your first return.

If you only listen to one of these four, this is the one with real money attached to it.