TRE vs MSS vs CDS Data: What UK Importers Need to Know

If you have been requesting MSS data from HMRC, you are using a legacy format that is being replaced. The Trader Records Extract (TRE) supersedes MSS with line-level detail.

What Was MSS Data?

Monthly Statistical Statements (MSS) were summary-level customs data reports provided by HMRC. They showed aggregate import and export values by commodity code and country, but lacked declaration-level detail. This meant you could see high-level trends, but not the specific lines, values, or customs treatments behind them.