Why Electronics Manufacturers Underprice PCB Assembly (And What to Track Instead)
Most electronics manufacturers quote PCB assembly jobs based on “cost per board.” It seems logical, calculate your material costs, add labour time, apply your overhead rate, and you’ve got your price. Except this approach misses about half the actual costs involved in PCB assembly.
The problem is that PCB assembly costs are layered in ways that traditional costing methods simply don’t capture. And when you miss these costs, you end up under-pricing work and sometimes dramatically.
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The Real Cost Layers Behind PCB Assembly
When you assemble a printed circuit board, you’re managing a complex cost structure that changes with every single job.
Setup costs are where most costing systems start falling apart. Your SMT line doesn’t just spring into action when boards arrive.
Someone’s programming the pick-and-place machine, loading component reels, setting up the stencil printer, and running test boards. That might take two hours for a straightforward job, or a full day if you’re dealing with fine-pitch components or a new design.
If you’re running 1,000 boards, those setup costs spread quite nicely. But what happens when a customer orders 50 boards? Or 25? Suddenly that same two-hour setup represents a massive cost per unit and it needs capturing accurately.
Material costs seem straightforward until you actually track them. Yes, you’ve got the PCBs themselves and the components. But what about the solder paste you’re using? The cleaning solvents? The programming costs for complex BGAs? The protective coatings?
Then there’s component wastage. Your pick-and-place machine doesn’t have 100% placement accuracy. You’ve got components that get rejected, dropped, or damaged during loading. If you’re working with expensive ICs or RF components, this wastage can dwarf your quoted material costs.
The labour element is rarely just about assembly time. You’ve got incoming quality checks, component preparation, machine operation, visual inspection, AOI review, rework, testing, and packing. For a complex assembly with through-hole components alongside SMT, you might have boards touching six different workstations.
And here’s what nearly everyone misses: the specialist time. When that BGA needs rework, you can’t send it to your general operative.
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You need your experienced technician. But most costing systems just average all labour together.
Quality and testing vary wildly between jobs. A simple LED board might need just a visual check and a functional test. A medical device PCB? You’re talking about AOI, X-ray inspection for hidden solder joints, in-circuit testing, functional testing, and potentially environmental testing. Each layer adds cost that isn’t captured in a simple “£X per board” calculation.
Why Cost per Board Is Almost Always Wrong
The fundamental problem with quoting a single cost per board is that it assumes linear costs. It assumes that making 100 boards costs exactly ten times what making 10 boards costs.
This is categorically false in electronics manufacturing.
Your fixed costs setup time, programming, first article inspection stay roughly the same whether you’re running 10 boards or 1,000 boards. Your semi-variable costs like machine time and testing don’t scale linearly because you’ve got minimum batch sizes and efficiency losses at different volumes.
A factory might quote £15 per board for a 100-unit run, when the actual cost of a 25-unit run of the same board is closer to £35 per unit. The setup costs haven’t changed. The testing requirements haven’t changed. But the cost per board has more than doubled.
Then there’s the component procurement issue. You buy components for a 100-board run. The customer later orders 25 more boards. Now you’re opening up a new purchase order, paying shipping again, potentially dealing with minimum order quantities that leave you with excess stock. Those costs need capturing, but they rarely are.
The Hidden Cashflow Problem in Electronics Manufacturing
Here’s where under-pricing PCB assembly really starts to hurt: the cash timing problem.
You order components when you win the job. Payment terms from your suppliers? Probably 30 days. Payment terms from your customer? Could be 60 or even 90 days in this industry. So you’re funding the entire job. Components, labour, overheads for potentially three months before you see any money back.
If you’ve underpriced the job by even 20%, you’re losing margins and tying up working capital in work that’s actually losing you money. If you do this across enough jobs, and you create a cashflow crisis even while your factory is at full capacity.
Profitable-looking electronics manufacturers can run into serious cashflow problems precisely because of this.
On paper, they’ve got healthy margins. In reality, they’re constantly scrambling for cash because they’ve systematically underpriced their work and the cash timing makes it worse.
Why General Accountants Miss This
Traditional accounting isn’t set up to capture the real costs in electronics manufacturing. Most accountants will give you a cost per board based on an absorption costing method that spreads overheads evenly across all production.
But that doesn’t reflect reality.
Your SMT line costs you £8,000 a month to run whether you’re making 10,000 boards or 2,000 boards.
Your programming and setup time is job-specific, not volume-specific.
Your testing costs scale with complexity, not just quantity.
General accountants also typically miss the capacity constraint issues.
When you accept a low-margin job that fills your SMT line for a week, you’re making less profit on that job and blocking your line from higher-margin work. That opportunity cost is real, but it never shows up in standard costing.
What Electronics Manufacturers Should Track Instead
So what should you actually be measuring?
Track setup costs separately for every job. Time and materials for machine programming, component prep, and first-article inspection.
This is direct cost that varies by job complexity, not volume.
Calculate cost per hour of machine time, not cost per board. Your SMT line, wave soldering machine, and test equipment all have an hourly cost to run.
Track how many hours each job actually consumes.
Monitor yield rates by job type. What percentage of boards pass first-time inspection? What’s your rework rate? This tells you where your real costs are hiding.
Separate your labour into standard work and specialist work. That BGA rework technician costs you differently than your general SMT operator, and your costing needs to reflect it.
Track component wastage by component type and supplier. If you’re consistently losing 5% of a particular component type, that needs factoring into your standard costs.
Most importantly, build job-specific cost models for quotes. A 1,000-board run of a simple design isn’t the same as a 1,000-board run of a complex multi-layer assembly with fine-pitch components. Your pricing shouldn’t treat them the same.
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The Reality Check You Need
If you’re running an electronics manufacturing business and you’re not tracking these cost layers separately, you’re almost certainly under-pricing some of your work.
Once you start tracking the real cost structure, you can price accurately and spot the jobs that actually make you money versus the ones that just keep you busy.
Want to know what your PCB assembly actually costs? I specialise in helping electronics manufacturers build costing systems that capture the real economics of production.
This is not generic manufacturing advice. Proper electronics-specific cost analysis that shows you exactly where your money’s going.
Get in touch, and let’s look at your actual numbers.
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About the Author
Written by Yesim Tilley Founder of Skynet Accounting is a chartered accountant with over 20 years of experience supporting manufacturing and engineering businesses across the UK. Specialising in cost analysis, product costing, and financial strategy, she helps industrial businesses understand their numbers and make more profitable decisions. Skynet Accounting provides tailored finance, compliance, and taxation support designed specifically for the manufacturing and engineering sector.