What Is IMDS, and Why Did Your Customer Just Ask For It?
Most suppliers meet IMDS the same way. A purchase order lands, or a PPAP package comes back marked incomplete, and somewhere in the requirements is a line about submitting material data. There is no explanation attached, no training, and often no one at the customer who can walk you through it. Just a system you have never opened and a deadline tied to a part you are already tooled up to ship.
If that is roughly where you are, three things are worth knowing before anything else. The requirement is normal. It is learnable. And it does not have to sit with you.
What IMDS actually is
IMDS stands for International Material Data System. It is the automotive industry's shared record of what vehicles are made of, reported all the way down to the individual substances in every part.
The unit of work is a Material Data Sheet, or MDS. An MDS describes one part: its components, the materials those components are made from, and the substances in those materials, with weights that have to add up correctly. You build that structure in IMDS, then send it to your customer, who reviews it and either accepts it or rejects it back to you.
Your customer then attaches your MDS to their own, and sends theirs up the chain. Stack enough of those together and an automaker can answer a question no single company could answer alone: what, exactly, is in this vehicle.
Practical takeaway: an MDS is not a document you write. It is a structured data tree you assemble, and the structure is where most first attempts go wrong.
Why the industry built it
Two pressures created IMDS, and both are still active.
The first is restricted substances. European rules on end-of-life vehicles set limits on lead, mercury, cadmium, and hexavalent chromium in new vehicles, with a list of specific exemptions where no viable alternative exists yet. Automakers cannot certify compliance on a vehicle unless they know what is in every part, and they cannot know that without asking you. The broader watchlist, the Global Automotive Declarable Substance List, or GADSL, extends well past those four and gets revised regularly.
The second is recycling. Vehicles have recovery and recyclability targets to hit. Meeting them requires knowing the material composition of a vehicle before it is ever scrapped, which again means collecting the data at the point of manufacture.
Worth flagging for anyone planning ahead: the original EU End-of-Life Vehicles Directive is being replaced. Negotiators reached a provisional agreement on a new ELV Regulation in December 2025, and the compromise text was published in February 2026. The direction of travel is more reporting, not less, with new emphasis on circularity and recycled content.
Practical takeaway: treat IMDS as a permanent condition of supply rather than a one-time hurdle, because the reporting scope is expanding.
Who is actually on the hook
The automaker requires material data from its direct suppliers. Those Tier 1 suppliers cannot produce it without data from the companies that supply them, so they pass the requirement down. Tier 2 passes it to Tier 3, and so on.
The effect is that a requirement written for very large companies lands on very small ones. A shop with twenty people and no compliance department ends up owing the same quality of data as a supplier with a dedicated materials engineering group. Nobody designed it that way on purpose. It is just what happens when an obligation flows downhill.
You will usually encounter it in one of two places: as a line item in a PPAP submission, where an accepted MDS is a gate to approval, or as a standing condition in your customer's supplier requirements manual.
Practical takeaway: if you supply into automotive at any tier, assume this is coming, and find out now whether your customer wants the MDS sent to a specific company ID.
What a submission actually involves
The IMDS account itself is free. That surprises people who assume the cost is licensing. It is not. The cost is time and knowledge.
A submission means gathering the real material composition of your part, which often means chasing your own suppliers for data they are equally unprepared to give. It means classifying each material correctly against IMDS rules, declaring anything on the GADSL, and applying the right exemption in the right way when a restricted substance is legitimately allowed. It means passing the system's plausibility checks, which will reject a tree that looks fine to a human but violates a rule you have never read.
A simple part, something like a plated bolt, is genuinely quick once you know what you are doing. A sealed electrical connector with a leaded brass terminal and four component types is a different exercise, and it is the one that tends to come back rejected.
Practical takeaway: the first submission is the expensive one. What you are paying for is the learning curve, not the part.
Where to start this week
Find out three things from your customer: which company ID they want the MDS sent to, what deadline is actually attached, and whether an existing submission for a similar part can be reused. Those three answers change the size of the job considerably.
Then make an honest call about who does the work. Building the capability in house makes sense if IMDS is going to be a recurring, high-volume part of your business and you have someone with the time to own it properly. Handing it to a specialist makes sense if you need it correct and accepted quickly, and your team's hours are better spent on the parts themselves.
Back to that email that started this. It is not a signal that something has gone wrong. It is a normal condition of doing business in automotive, arriving at a company that has not had to deal with it before. The requirement is fixed. Who carries it is not.
Need an MDS submitted and accepted without building the expertise from scratch? IMDSnow handles the full process for automotive suppliers at Tier 2, 3, and 4, at a flat fee with no surprises. Request a free, no obligation quote and we will come back within one business day.