In the world of manufacturing, uncertainty is a luxury nobody can afford for long. Production lines need to be supplied, operators need to know what’s going on and customers expect their orders to be delivered on time. When inventory is in order, everything hums along smoothly. When it’s not, production grinds to a halt, costs skyrocket and teams are scrambling to pick up the pieces.
That’s why getting inventory for manufacturing right is more than just a bit of planning. It’s what keeps your operations stable, efficient and scalable. If you want to improve your manufacturing performance, this is a good place to start.
Inventory in manufacturing is not just about finished goods, it's about all the different types of inventory that are involved.
Think about it:
Raw materials to get started
Components and sub-assemblies that get pieced together
Work-in-progress, which is still getting finished up
And finished products that are ready to go out the door
Finished goods inventory is just the last step in the production cycle. Products that are ready to sell or deliver.
Each of these types behaves differently. Each sits at a different stage of the production cycle. And each needs to be managed carefully. That’s why inventory for manufacturing is a lot more complicated than just stock control. It’s at the heart of production, supply chain and finance.
In manufacturing, inventory isn’t something you can just live without. It’s the fuel that keeps production running.
Without the right inventory:
Production lines shut down
Schedules collapse
Labour sits idle
Orders get delayed
Having too much inventory creates a different problem:
Excess inventory ties up cash flow in stock
You run out of space to store it all
There’s a higher risk of the stuff going out of date
Getting the balance right is the challenge. Not too much, not too little, just enough to keep production flowing.
Production flow depends on materials being available at the right time and at the right inventory levels.
Getting inventory for manufacturing right means:
Materials show up when they’re supposed to
Components are staged correctly
Production can keep running without a hitch
Having some safety stock on hand can help protect production from supplier delays and unexpected demand spikes.
When inventory and production are working together:
Throughput improves
Lead times get shorter
Efficiency increases
But when they’re out of sync:
We find ourselves expediting stuff all the time
Schedules change all the time
Costs creep up quietly
Inventory is what links planning to execution.
Most manufacturing environments face similar issues.
These include:
Material master data that’s just plain wrong
Inventory records that you can’t trust
Too much work-in-progress just hanging around
Poor visibility across different production stages
Teams still tracking inventory manually
A lot of operations struggle with raw materials. 46% of manufacturers say it’s one of their top challenges. Regular cycle counting can help avoid those annual inventory shutdowns and keep raw materials under control.
These problems don’t usually just spring up overnight. They build up gradually. And when they do, manufacturing performance starts to suffer.
Bills of material (BOMs) are at the heart of production.
They tell you:
What materials you need
How much you need
When you need it
If the BOM data is wrong:
Production orders are inaccurate
Materials run short
Excess stock builds up elsewhere
Getting BOMs right is fundamental to effective inventory management in manufacturing. Without them, planning is just a shot in the dark.
Work-in-progress is one of the most overlooked areas of inventory. Too little WIP and production grinds to a halt. Too much and your systems get clogged.
Effective manufacturing inventory management means keeping WIP:
Visible at all times
Controlled and well-managed
Aligned with the capacity of your operation
This means having clear process stages, consistent tracking and regular review in place. WIP is where inefficiency often hides - managing it well can unlock big performance gains.
Inventory and planning go hand in hand.
Planning decisions are based on:
What stock you have available
What’s coming in from suppliers
Production demand - and customer demand that’s shifting all the time
Inventory for manufacturing supports planning by:
Feeding accurate data into your planning systems for demand forecasting
Highlighting shortages early so you can meet customer demand
Letting you schedule realistically
Good demand forecasting helps prevent waste and stockouts. It improves customer satisfaction and cash flow. When inventory data is reliable, planning becomes proactive. When it isn’t, planning becomes reactive.
Inventory control is what makes sure the numbers in the system match reality. In manufacturing, that means:
Recording inventory movements as they happen
Using inventory tracking to monitor consumption during production
Maintaining accurate stock balances
ABC analysis is a way of categorizing stock by value and usage frequency. It helps businesses focus on high-value items and increases management efficiency.
Regular inventory audits and cycle counts can help businesses ensure inventory accuracy without relying on those annual shutdowns.
Good control reduces:
Shrinkage
Errors
Unexpected shortages
Without control, even good planning can break down quickly.
SAP is widely used in manufacturing because it can link up inventory directly with production across loads of different factory operations.
It lets you:
Plan your materials and stock with a material requirements planning (MRP) system
Have real time visibility on what's going on
Tie together production orders with stock levels
Automatically track when materials are being used up
Which means in practice you get:
Production numbers that match up with real inventory levels
A clear financial view of what’s going on
Production planning that stays in sync with stock and production data, even when suppliers are involved
But all of this only works if you keep your data, processes and management systems in order.
Even if you've got a great system, things can still go wrong.
Over time all sorts of things can happen:
Your product range expands
Demand patterns change
Processes get adapted in a bit of an ad-hoc way
And if you don't keep on top of things, before long:
Your data gets outdated
Your parameters stop reflecting what's really going on
People start finding workarounds
And then your inventory for manufacturing is no longer working properly.
Application Management Services (AMS) help keep your inventory aligned with the reality of your production. They help by supporting all the ongoing work involved in inventory management.
They can help with:
Keeping your data tidy and under control
Tuning up your planning parameters
Making sure your systems are aligned with what's going on in the factory
Fixing problems before they cause a problem
With more and more CEOs ramping up their digital spending in 2023, it's more important than ever to keep your systems up to speed.
This ongoing support means that your inventory continues to support your production, rather than getting in the way, and helps streamline your operations.
The decisions you make about inventory have a big impact on overall cost and inventory costs.
When your inventory management is good in manufacturing:
You cut waste
You get higher asset utilisation
You support smooth production
Economic order quantity is a key part of figuring out the optimum order size to keep costs down.
And if you're not careful, poor inventory management will lead to:
Excess stock
Higher handling and storage costs
The need for costly last-minute fixes
The inventory turnover ratio is a key metric to track. It shows how often your inventory is sold and replaced. And if you get your raw materials inventory wrong, you can end up wasting.
That's why inventory is a key operational and financial lever - it can help you control costs, boost productivity and support greater profitability.
When your inventory management is working well in manufacturing you get:
Production flowing without constant interruptions
Materials where they need to be
Inventory levels that feel deliberate
Teams that trust the data
Costs that are under control without compromising service
Good inventory management strategies tie together stock, planning and production without overloading operations.
Inventory becomes basically invisible and that's the point.
Inventory for manufacturing
The management of all the raw materials, components, work in progress and finished goods that get used in the production process.
Work in progress (WIP)
It's the inventory that's partially made during the production process.
Bill of material (BOM)
It’s a list of all the materials you need to make a product.
Material requirements planning (MRP)
It's a system that plans material supply based on what you need and when you need it.
Inventory control
Its the process of using all the techniques you need to track and manage your stock accurately.
Average inventory
It's the average stock you hold over a certain period often used in inventory metrics.
Inventory system
It’s the method or software you use to record and monitor your stock.
Periodic inventory system
It’s a method where you count your stock at set intervals rather than in real time.
Perpetual inventory systems
These are systems that update your stock levels in real time.
Perpetual inventory management
It’s an approach that lets you keep your stock levels up to date continuously.
Physical inventory
It’s the manual count of stock on hand.
Physical inventory counts
These are the manual checks you use to validate your system records.
AMS (Application Management Services)
Ongoing support and improvement for your SAP systems after it’s been set up.
What is inventory for manufacturing?
Its the management of all the raw materials, WIP and finished goods used and produced across the production process.
Why is inventory critical in manufacturing?
Because production depends on having the right materials available at the right time to meet customer demand, while avoiding shortages and delays.
How does poor inventory affect production?
It leads to delays, inefficiency, higher costs and unreliable delivery.
Can SAP improve inventory for manufacturing?
Yes - SAP can integrate your inventory with your production and planning, giving you better inventory tracking, visibility and control.
Why does inventory performance decline?
Because either your processes or your data aren't kept up to date as the business changes.
What software helps manage inventory in manufacturing?
Many manufacturers use inventory management software - or even broader manufacturing software - to automate planning, control stock and improve accuracy. The right software can also help with forecasting and reduce manual effort.
What’s the difference between pull and push approaches?
A pull strategy aligns production more closely with actual customer orders, which can help reduce excess stock. A push strategy relies more on forecasts to plan output in advance.
How do manufacturers keep inventory records accurate?
Clear processes, careful data handling and accountability are key - many companies actually rely on inventory managers and conduct regular inventory audits to catch errors early.
Inventory management for manufacturing is all about more than just tracking what's in stock - it's about the heartbeat of the entire operation. Just In Time (JIT) manufacturing can work wonders in keeping costs down on storage, by perfectly timing the delivery of raw materials to match what the factory's actually going to need. It's all about keeping the production line flowing.
When your inventory is properly in sync with production needs:
everything just clicks into place
your teams feel confident they can get the job done
you're in control of your spending
But it's when your inventory gets out of whack that things can get really tough. So a top-notch inventory management system is one of the real game changers in getting your manufacturing humming along - and that's exactly where we come in.