OEM Buyers: Stop Letting Your EMS Control Your Bare Board Spend

Understand the landed cost before turning procurement over to EMS.

A good EMS partner brings real value. It manages assembly labor, SMT placement, inspection, test, rework, box build, documentation, scheduling and production discipline. That is what it is paid to do. EMS companies exist because OEMs need manufacturing execution without necessarily running a factory. In the standard EMS model, the EMS may also handle procurement, supply chain coordination and material sourcing on behalf of the OEM. That is normal. It is also convenient.

But convenience is not the same thing as control.

And when it comes to bare printed circuit boards, OEM buyers are giving up control without realizing how much it is costing them.

I see this all the time: an OEM sends a complete assembly package to an EMS. The EMS quotes the finished PCBA. The quote includes components, labor, test, freight, overhead and the bare PCB. The OEM buyer looks at the final assembly price and negotiates a few points. Maybe they ask for a better labor rate. Maybe they push on freight. Maybe they challenge a few expensive ICs.

But the bare board line? It is buried.

That is where the leakage starts.

Bare PCBs are often treated as just another material line item inside the EMS turnkey quote. They are not just another line, however. On many industrial, medical, power, RF, flex, rigid-flex, heavy copper or high-mix programs, the bare board is one of the most strategic cost drivers in the entire assembly. It affects yield. It affects lead time. It affects reliability. It affects tariff exposure. It affects documentation. It affects whether the assembly runs cleanly or becomes a weekly production headache.

And yet many OEMs let the EMS buy the board, mark it up and pass it along.

A 10–25% markup on the bare board before a single component is placed is not unusual in the real world of turnkey quoting. The EMS may call it material handling. Or procurement cost. Or carrying cost. Or margin. Or it may not be broken out at all.

I am not saying every EMS is doing something improper. It is running a business. If it purchases material, finances inventory, manages vendor risk and owns the PO, it expects margin.

The problem is not that the EMS makes money. The problem is that the OEM often does not know how much.

Take a simple example. A six-layer, impedance-controlled industrial board with ENIG finish, tight registration, controlled laminate callout and annual usage of 12,000 pieces across repeat builds. The EMS quotes the bare board portion at $23. A transparent, direct-source price, landed and properly documented, is $18.75. That difference is $4.25 per board.

That sounds small until the math is done. At 12,000 pieces, that is $51,000 per year on one part number. With five similar high-mix boards, the total reaches a six-figure annual purchasing issue. Not an engineering issue. Not a quality issue. A purchasing issue.

This is why OEM buyers need to look seriously at a consignment model for high-value or high-mix bare boards.

In a consigned model, the OEM purchases the material directly and supplies it to the assembly partner. The EMS remains responsible for assembly and test, but the OEM controls the sourcing, supplier relationship, documentation and material cost. That model gives the OEM more cost transparency and sourcing control, while the EMS focuses on production execution.

This does not mean consign everything.

For commodity two-layer boards, low-dollar repeat assemblies or programs where the EMS has proven buying power and transparent pricing, turnkey may be fine. If the board is a small portion of the total assembly cost, do not create unnecessary administrative work.

But for expensive boards, specialty boards, high-mix/low-volume production, volatile forecast programs or products where documentation matters, the OEM should at least quote the PCB independently.

The timing is especially important now. PCB cost pressure in 2026 is not theoretical. Raw materials such as copper, gold, tin, silver, nickel, FR-4, copper-clad laminates, prepregs and polyimide are under pressure, with AI and data-center demand pulling on upstream PCB material and fabrication capacity. Reuters last month reported that PCB prices had surged sharply in some segments because of resin, copper foil, glass fiber and broader supply disruptions, with AI server demand worsening the imbalance.

When the market is calm, hidden markup is expensive. When the market is volatile, hidden markup is dangerous.

Tariffs add another layer. Bare PCBs are generally classified under HTS heading 8534 as printed circuits, and US Customs and Border Protection (CBP) has ruled that an unpopulated FR-4 bare PCB falls under 8534.00.0040; in that ruling, the base duty was free, but China-origin goods under that subheading were subject to an additional 25% Section 301 duty unless excluded.

As of March, industry tariff guidance showed very different effective tariff treatment depending on origin and board type, including different treatment for certain 2-layer and 4-layer FR-4 boards versus 6-layer, flex and non-FR-4 boards.

That means the buyer needs visibility.

Where was the board fabricated? What is the country of origin? What HTS code is being used? Was the board quoted from China, Malaysia, Thailand, Taiwan, Vietnam or somewhere else? Are tariffs included? Are they broken out? Is the EMS applying margin on top of tariff and freight? Is the EMS using the same shop every time or moving the part number around without disclosure?

These are not minor details. These are purchasing controls.

A transparent broker can help here because the job is not merely “find me a cheaper PCB.” That is the wrong mindset. The job is to quote the board correctly, match the board to the right factory, document the assumptions, identify the tariff exposure and provide a landed cost the OEM can actually understand.

The consignment process does not have to be complicated, but it does need discipline.

Start with the top 10 PCB part numbers by annual spend, not by unit volume. Pull the EMS quote and identify the bare board cost if it is visible. If it is not visible, ask for it. Then quote those same boards independently using the full data package: Gerbers or ODB++, fabrication drawing, IPC class, stackup, material callouts, copper weights, surface finish, solder mask, silkscreen, impedance requirements, controlled depth drilling, via fill, UL requirements, RoHS/REACH requirements, electrical test, microsection needs, coupon requirements, packaging instructions and annual usage.

Then compare landed cost to landed cost.

Do not compare factory price to EMS price. That is amateur math. Compare the true landed number, including freight, duties, tariffs, broker fees, packaging, payment terms, inspection requirements and reasonable buffer inventory.

If the savings are 10% or less, leave it alone. The EMS convenience may be worth it. If the savings exceed 10%, there’s a decision to make.

The right way to present this to the EMS is not adversarial. Do not say, “We caught you marking up boards.” Say, “We are thinking of moving these bare board part numbers to OEM-controlled procurement. You will continue to assemble, test and support the product. We will provide approved, documented incoming material under a consignment agreement.”

Either the EMS company will adjust its pricing to what the company feels is a more reasonable margin or relinquish the board purchasing entirely.

If the former, great. If the latter, then put the rules in writing.

The EMS should confirm receiving inspection requirements, acceptable overage, storage conditions, FIFO rules, shelf-life handling, lot traceability, nonconforming material process, scrap reporting, attrition allowance and responsibility if boards are damaged during assembly. The OEM should provide complete documentation with every shipment: packing list, certificate of conformance, lot/date code information where applicable, electrical test confirmation, impedance report if required, microsection report if required and any customer-specific quality documents.

There’s also the decision on who owns excess inventory when the revision changes. That is one of the real tradeoffs of consignment. Turnkey can improve cash flow because the EMS is buying and holding material. Consignment gives control, but the OEM owns more of the planning burden and inventory risk.

That is why this model is not for lazy purchasing. It is for disciplined purchasing. But OEM buyers should remember something: control is not free, and neither is convenience. The question is which you are paying for.

If the EMS is adding real value on procurement – showing the supplier, documenting the source, breaking out tariffs, managing lead time, absorbing risk, and pricing fairly – keep it involved.

But if the bare board is hidden inside the assembly quote, if the source is vague, if the markup is invisible, if tariffs are blurred into “material cost,” or if the EMS refuses to provide details, then no purchasing strategy exists. There is a blind spot.

And in 2026, with PCB materials, tariffs, freight and capacity all moving at once, blind spots are expensive.

OEM buyers should stop treating bare boards as an EMS-controlled pass-through. For the right programs, buy the PCB directly through a transparent broker, consign it to the EMS and let the EMS do what it does best: build the assembly.

A change in assembler may not be necessary. Greater control may simply require removing assembler control over bare board spend.End of article content

Greg Papandrew has more than 25 years’ experience selling PCBs directly for various fabricators and as the founder of a leading distributor. He is cofounder of DirectPCB (directpcb.com); greg@directpcb.com.