Manufacturers entering the second half of 2026 are caught between two costly risks: running short on critical spares and tying up too much working capital in overstocked PLCs, VFDs, drives, HMIs, and MRO parts. The practical question is no longer simply “Do we have enough inventory?” — it is “What is this inventory costing us to keep?”

Why H2 2026 Turns Overstock Into a Finance Problem

Inventory discipline is becoming a boardroom issue. Supply Chain Dive reported in June that manufacturers are balancing product availability against the financial burden of carrying excess inventory, with companies paying closer attention to where inventory sits across the network and how it affects cash flow (Supply Chain Dive). For plant managers and procurement teams, that means the storeroom is no longer just an operational insurance policy. It is also a working-capital line item.

The tension is understandable. After several years of shortages, long lead times, tariff volatility, and supplier uncertainty, many manufacturers rebuilt safety stock. GEP reported that safety stockpiling reached its highest level since January 2023, while North American supply chain pressure rose to its highest reading since August 2022 (Supply Chain Outlook). Nobody wants to be the plant that cannot restart a line because a discontinued drive, communication module, or HMI panel is missing.

But overstock has a compounding cost. A spare PLC that sits untouched for three years is not just “paid for.” It consumes capital, shelf space, insurance coverage, cycle-count labor, obsolescence risk, and management attention. When interest-rate uncertainty and elevated prices persist, dead stock working capital manufacturing teams once ignored becomes harder to defend.

This is especially true for industrial automation and electrical MRO inventory. PLCs, VFDs, servo drives, motor starters, power supplies, HMIs, safety relays, and I/O modules can carry high OEM replacement cost, but their resale value depends on condition, documentation, firmware generation, current installed base demand, and whether the part is still actively used in production environments.

💡 Insight: In H2 2026, the best surplus decision is not “sell everything” or “keep everything.” It is to calculate the annual carrying cost of each overstock category, then compare that cost to recovery value and operational risk.

Build an MRO Inventory Carrying Cost Calculator

A useful MRO inventory carrying cost calculator does not need to be complex. It only needs to convert idle inventory into an annual dollar cost that finance, procurement, and maintenance can all understand. Start with the inventory’s replacement or book value, then apply realistic cost factors.

A simple formula:

Annual carrying cost = inventory value × carrying cost rate

For excess industrial parts, the carrying cost rate often includes five buckets:

Cost of capital: The opportunity cost of cash tied up in unused spares.
Storage and handling: Warehouse space, bins, racking, internal moves, and cycle counting.
Insurance and tax exposure: Coverage and asset-related costs where applicable.
Obsolescence risk: Value loss from firmware changes, discontinued platforms, OEM transitions, or equipment standardization.
Shrinkage and condition degradation: Lost labels, missing packaging, shelf wear, battery issues, corrosion, or incomplete documentation.

Use ranges, not false precision. If finance has an approved working-capital hurdle rate, start there. If not, create a low, medium, and high carrying-cost view. For example, a plant holding $250,000 in unused automation spares could model:

10% annual carrying cost: $25,000 per year
18% annual carrying cost: $45,000 per year
25% annual carrying cost: $62,500 per year

That does not mean every part should be liquidated. It means the organization can see what it pays each year to preserve the option of using those parts later.

For PLCs, VFDs, drives, and HMIs, add a time-risk factor. A sealed current-generation safety relay is different from an obsolete HMI with uncertain firmware. A surplus VFD used across 40 active machines is different from a servo amplifier tied to a decommissioned packaging line. The cost of holding excess MRO inventory should rise when the probability of future use declines.

Overstock category	Typical finance question	Carrying-cost risk	Practical review trigger
Current PLC and I/O spares	Are these still installed across active lines?	Medium	Keep if tied to critical assets and verified usage
Legacy PLCs and discontinued modules	Will demand fall before we use them?	High	Price for resale before documentation or demand deteriorates
VFDs and motor drives	Are ratings duplicated beyond failure history?	Medium to high	Compare quantity on hand to installed base and repair history
HMIs and operator panels	Are firmware, screen size, and part numbers documented?	High	Sell or consign if tied to retired equipment standards
General MRO spares	Are these stocked because of policy or actual consumption?	Variable	Segment by usage, lead time, and criticality

Do the math at part-family level first. You do not need perfect item-level data to start. Pull the highest-value PLC, VFD, drive, HMI, and electrical MRO categories from your ERP, CMMS, or storeroom spreadsheet. Then calculate the carrying cost for each category before going line by line.

📊 By the Numbers: If $100,000 of unused VFDs carries an 18% annual cost, the plant is effectively spending $18,000 per year to keep those drives available — before any obsolescence or condition discount is applied.

Decide What to Keep, Consign, or Sell Outright

The right recovery path depends on time, certainty, and risk. Digital consignment and quick sell solve different working-capital problems. One prioritizes market exposure and offer discovery; the other prioritizes immediate liquidity and balance-sheet cleanup.

Before choosing a channel, separate your overstock into three decision groups.

1. Keep: high-criticality spares with credible future use

Keep inventory when the part protects active production, has a documented installed base, and would create material downtime risk if unavailable. ISM’s May 2026 Manufacturing PMI showed supplier deliveries slowing, customer inventories still in “too low” territory at 42.7%, and the Prices Index elevated at 82.1% (ISM). In that environment, cutting too deeply into critical spares can backfire.

A keep decision should still be documented. Record the asset, line, quantity required, lead-time assumption, and the person accountable for the decision. “Maintenance wants it” is not enough. “Two units support four running lines with no approved substitute” is better.

2. Digitally consign: valuable surplus with market demand but no urgency

Digital consignment fits surplus parts that still have industrial buyer demand but do not require an immediate cash event. This often includes unused PLC modules, sealed VFDs, HMIs, servo drives, breakers, safety controllers, power supplies, and automation components where the seller can wait for qualified offers.

This path is useful when the part has enough value to justify market exposure and the plant does not want to ship inventory before a real purchase offer exists. It also helps when book value is less important than recovery value: the question becomes what a qualified buyer will pay for the exact part number, condition, and documentation.

3. Quick sell: dead stock where carrying cost exceeds waiting value

Quick sell fits the opposite situation: the carrying cost, audit burden, or corporate need for liquidity outweighs the benefit of waiting. If a plant has duplicate PLCs from a retired platform, VFDs for equipment that has been replaced, or HMIs from a standardization project, the better financial answer may be immediate recovery rather than another year of storage.

This is where the decision threshold matters. If an item’s estimated annual carrying cost is greater than the expected incremental value from waiting, holding it is financially weak. For example, if a group of surplus drives might recover $30,000 today but perhaps $36,000 later, waiting only makes sense if the extra $6,000 is greater than the carrying cost, obsolescence risk, and staff time required to manage the inventory.

For a deeper comparison of recovery paths, see Consignment vs Buyout vs Auction for 2026 MRO.

⚠️ Watch Out: Do not use OEM cost as the only decision anchor. A $2,000 obsolete module that never moves is not protecting working capital; it is consuming it.

Apply the Threshold Before the Year-End Rush

H2 2026 is the right time to set decision rules. S&P Global reported that global manufacturing input costs saw the sharpest spike since June 2022 during April 2026, while supply chain delays and energy and shipping costs added pressure (S&P Global). When costs are volatile, a passive surplus policy becomes expensive.

Use a simple threshold matrix:

Keep if the part supports active equipment, has low substitution options, and the quantity is justified by downtime exposure.
Digitally consign if the part is valuable, identifiable, marketable, and not needed for current production.
Quick sell if the part is dead stock, duplicated across sites, tied to retired assets, or creating a measurable working-capital burden.
Scrap or recycle only when resale demand is weak, condition is poor, or documentation is insufficient.

Documentation raises recovery value. For automation parts, the difference between “miscellaneous PLC card” and “sealed Allen-Bradley 1756 module with part number, series, firmware label, and photos” can be material. Before deciding whether to consign surplus PLCs, sell excess VFD spare parts, or clear dead stock MRO inventory, capture:

Manufacturer and exact part number
Series, revision, firmware, voltage, horsepower, or amperage where applicable
New, used, repaired, or unknown condition
Packaging status and photos
Quantity by site
Whether the supported asset is active, decommissioned, or unknown

Multi-plant duplication deserves special attention. A single site may justify two spare HMIs. Ten sites each holding two for the same retired line may represent a hidden surplus pool. If you have not already consolidated visibility, a multi-plant MRO visibility review can expose duplicate automation spare parts that no one site sees as excessive.

🔑 Key Takeaway: The decision to keep, consign, or quick sell should be made before inventory becomes obsolete, unlabeled, or politically difficult to challenge during year-end working-capital reviews.

What To Do Now

Pull a high-value MRO export by category. Start with PLCs, VFDs, servo drives, HMIs, power supplies, safety components, and electrical spares. Include OEM cost, quantity, location, last issue date, and supported asset if available.
Assign a carrying-cost rate and calculate annual drag. Use finance’s working-capital rate if available. If not, model 10%, 18%, and 25% scenarios so maintenance, procurement, and finance can see the sensitivity.
Tag each item as keep, consign, or quick sell. Keep parts tied to active critical assets. Consign marketable surplus where time is available. Quick sell dead stock where the annual carrying cost and obsolescence risk exceed the benefit of waiting.

If your H2 2026 review shows that overstocked PLCs, VFDs, drives, HMIs, or MRO spares are tying up cash, Materialize can help you turn that surplus into recovery value. For immediate liquidity, upload your parts list and request a fast offer at https://trymaterialize.com/quick-sell.