You don’t lose money on big decisions.
You lose it on decisions that look small.
Make vs buy is one of them.
A ₹5 difference per part doesn’t feel like much. Until it runs across 5 lakh units a year. Now you’re looking at a ₹25 lakh mistake. Quietly.
The problem isn’t the decision.
It’s how most teams evaluate it.
Let’s fix that.
What is a Make vs Buy Decision?
A make vs buy decision is choosing whether to:
- Manufacture a component internally
- Source it from a supplier
In practice:
You’re comparing true internal cost vs total landed supplier cost, adjusted for volume, capacity, and risk.
Not just quoted price vs estimated cost.
How to Evaluate Make vs Buy the Right Way
Step 1: Build a Real “Make Cost” (Not a Sheet Cost)
If your make cost is just:
Material + Labor = Cost
You’re missing the real picture.
A proper model includes:
- Raw material (with scrap %)
- Cycle time (actual shop-floor data)
- Machine hour rate
- Tooling (amortized)
- Setup & changeover
- Rejection & rework
- Factory overheads
- Capacity impact
Here’s where most teams struggle:
All this data sits in different places. Excel sheets, ERP, tribal knowledge.
This is exactly where structured costing platforms like Cost It Right help.
You can build a detailed part-level cost, standardize assumptions, and avoid underestimating internal cost.
Step 2: Break the Supplier Quote (Don’t Trust the Final Number)
A supplier gives you one number. You need ten.
Break it into:
- RM basis
- Conversion cost
- Tooling
- Packaging & logistics
- Duties (if any)
Then test:
- Price variation clauses
- Volume slabs
- MOQ impact
Reality:
Without a structured comparison, you’re matching a detailed internal cost with a black-box supplier quote.
With Cost It Right, teams typically standardize supplier quote breakdowns and compare them line-by-line with internal costing.
That’s when gaps show up.
Step 3: Compare at 3 Volume Levels
Don’t lock your decision at current volume.
Run it at:
- Low volume
- Target volume
- Peak volume
Because:
- Fixed costs spread differently
- Supplier pricing changes
- Internal efficiency improves
Most teams don’t do this because it’s time-consuming in spreadsheets.
With Cost It Right, you can simulate volume changes instantly and see where the decision flips from buy to make.
Step 4: Check Capacity Like a Constraint
Don’t just check availability.
Look at:
- OEE
- Bottlenecks
- Queue time impact
- Effect on high-priority production
Important:
If a bottleneck machine is involved, your calculated cost is already wrong.
Advanced costing setups, like those built in Cost It Right, allow you to factor in machine utilization and understand the real capacity cost impact before deciding.
Step 5: Add Risk as a Cost
Risk shouldn’t sit in discussion. It should sit in numbers.
Convert it:
- Delay → line stoppage cost
- Quality → rejection + warranty
- Single sourcing → disruption risk
- Import → forex impact
Add a risk premium to supplier cost.
Now your comparison is real.
This kind of structured, scenario-based comparison is difficult to maintain manually, which is why many teams move to platforms like Cost It Right to keep decisions consistent.
Step 6: Evaluate Strategic Fit
Not all parts are equal.
- Critical / IP-sensitive → make
- Commodity → buy
- High volume → make gets stronger
- Low volume → buy makes sense
Ask this:
If this part fails, does the customer notice?
If yes, control matters more than cost.
Where Most Companies Go Wrong
- Incomplete internal costing
- Blind trust in supplier quotes
- No volume simulation
- Ignoring capacity constraints
- Risk not quantified
And most importantly:
They rely on static Excel models that break the moment assumptions change.
Final Take
Make vs buy is not a one-time decision.
It should evolve with:
- Volume
- Cost structures
- Supplier landscape
- Internal capacity
The edge is not in choosing make or buy.
It’s in having the clarity to switch at the right time.
That clarity comes from structured, comparable, and scenario-driven costing.
Quick FAQ
Q: When should you choose make over buy?
When volume is high, capacity is available, and the part is strategically critical.
Q: When is buying better?
When demand is uncertain, volumes are low, or supplier efficiency is higher.
Q: How can software help in make vs buy decisions?
Tools like Cost It Right allow you to compare internal and supplier costs, simulate scenarios, and make faster, data-backed decisions.
