Should You Outsource the Work or Keep It In-House? Let’s Do the Math.

There’s a particular kind of optimism that appears when a business starts growing.

Suddenly, everything seems possible.

We could bring production in-house.

Hire a specialist.

Buy equipment.

Build our own team.

Maybe even stop paying that outside vendor who seems to have developed a remarkable talent for increasing their rates.

And I love the enthusiasm.

Growth should create opportunities. That’s part of the fun.

But before we turn the spare office into a new department and start interviewing people, I’d like to answer one question.

Will doing this ourselves actually make the business better off?

Not just cheaper on a spreadsheet.

Better off financially, operationally, and strategically.

Because those aren’t always the same thing.

What Is a Make-or-Buy Analysis?

A make-or-buy analysis compares the financial and operational consequences of performing work internally versus purchasing it from an outside supplier.

You might use it when deciding whether to manufacture a component, outsource bookkeeping, hire an internal specialist, bring fulfillment in-house, or contract with an outside service provider.

The basic calculation is straightforward:

Financial advantage of outsourcing = Relevant in-house costs − Relevant outsourcing costs

If the result is positive, outsourcing is less expensive under the assumptions you’ve used.

If it’s negative, keeping the work in-house is less expensive.

But the word I want you to notice is relevant.

Because not every cost on your financial statements belongs in this decision.

And not every important consequence appears on your financial statements.

That’s where things get interesting.

The Vendor Quote Looks Expensive. Let’s See If It Actually Is.

Imagine a growing company that purchases 20,000 specialized components annually from an outside supplier.

The supplier charges $28 per component.

Annual purchasing cost:

20,000 × $28 = $560,000

Management believes it could produce the components internally for $19 each.

That sounds promising.

Nine dollars per unit in savings?

At 20,000 units?

Someone is probably already looking at equipment catalogs.

But I’d like to see the rest of the proposal.

Because manufacturing doesn’t begin and end with raw materials and labor.

For this hypothetical example, assume the company would incur these annual costs if it brought production in-house.

Cost	Annual amount
Direct materials	$180,000
Variable production labor	$140,000
Variable manufacturing expenses	$60,000
New equipment lease and maintenance	$90,000
Additional supervision and support	$50,000
Total in-house cost	$520,000

The first three costs total $380,000, or $19 per unit.

But bringing production in-house also creates $140,000 of annual fixed costs.

So the actual comparison is:

Option	Annual relevant cost
Continue outsourcing	$560,000
Produce internally	$520,000
Estimated annual savings from producing internally	$40,000

Still a good result.

Just not the $180,000 savings we initially imagined.

That’s why I like finishing the calculation before congratulating ourselves.

The champagne can wait.

Which Costs Actually Belong in the Decision?

This is where I see the most opportunity to improve a make-or-buy analysis.

The financial question isn’t simply, “What does it cost us today?”

It’s:

Which future costs and benefits will change depending on the option we choose?

Those are the relevant amounts.

Suppose the company already pays $100,000 annually to lease its building.

And suppose the new production activity would fit inside existing unused space without increasing rent or displacing another profitable activity.

Would I automatically include part of that $100,000 as an additional cost of bringing production in-house?

No.

The rent exists either way.

Allocating a portion of it to the new department might be appropriate for some internal reporting purposes, but that doesn’t make it an incremental cost of this decision.

Now imagine the company needs to rent additional warehouse space specifically for the new operation.

That’s different.

The additional rent matters because the decision causes it.

Same business.

Same type of expense.

Different financial treatment.

I know that sounds annoyingly particular.

But being particular about what actually changes is how you avoid making expensive decisions with very attractive spreadsheets.

Costs I’d want to investigate

Before approving an in-house proposal, I’d examine incremental labor, materials, equipment, maintenance, training, quality control, insurance, working capital, and any costs associated with getting the operation running.

I’d also identify costs that would disappear if we stopped outsourcing.

And I’d distinguish one-time implementation costs from recurring expenses.

That last distinction matters.

A decision can produce annual savings and still require an upfront investment that takes years to recover.

Both numbers belong in the conversation.

How Much Work Do We Need Before In-House Production Makes Sense?

Now we get to a question I particularly like.

At what volume does producing internally become the less expensive option?

This is where a make-or-buy break-even calculation becomes useful.

Using our hypothetical business:

• Outsourcing cost: $28 per unit.
• In-house variable cost: $19 per unit.
• Additional annual in-house fixed costs: $140,000.

Each unit produced internally avoids $28 of supplier spending but incurs $19 of variable production cost.

That’s a $9 advantage per unit before fixed costs.

The formula is:

Break-even volume = Additional in-house fixed costs ÷ (Outsourcing cost per unit − In-house variable cost per unit)

$140,000 ÷ ($28 − $19) = 15,555.56 units

Because we can’t produce a fraction of a component in this example, the first whole-unit volume at which in-house production becomes cheaper is 15,556 units.

At 20,000 units, the company saves $40,000 annually.

At 12,000 units, the picture changes.

Outsourcing:

12,000 × $28 = $336,000

In-house:

(12,000 × $19) + $140,000 = $368,000

Outsourcing would be $32,000 cheaper.

And now we’re having a much more useful conversation.

Because the best decision depends partly on how much volume we realistically expect.

Not how much volume we’d enjoy having.

Not how much the sales team believes is just around the corner.

Actual, supportable demand.

The Volume Forecast Deserves Its Own Conversation

Here’s something I would do before presenting this decision to management.

I’d run the economics at several production volumes.

Annual units	Outsourcing cost	In-house cost	Cheaper option
10,000	$280,000	$330,000	Outsource by $50,000
12,000	$336,000	$368,000	Outsource by $32,000
16,000	$448,000	$444,000	In-house by $4,000
20,000	$560,000	$520,000	In-house by $40,000
25,000	$700,000	$615,000	In-house by $85,000

For this table, we’re assuming the supplier’s $28 price, internal $19 variable cost, and $140,000 annual fixed cost remain constant across the volumes shown. We’re also assuming the internal operation can handle 25,000 units without further investment.

Those assumptions need verification in a real business.

But the comparison gives management something valuable.

It shows the economics of the decision changing as the business grows.

At 10,000 units, outsourcing is clearly less expensive.

At 20,000 units, producing internally has an advantage.

At 16,000 units, the savings are only $4,000.

Four thousand dollars.

On a decision involving new equipment, operational responsibilities, and potentially several employees.

I’d want a little more financial breathing room than that.

What If the Business Grows Faster Than Expected?

Here’s where this decision becomes genuinely exciting.

Suppose management expects demand to increase from 20,000 to 25,000 units over the next few years.

If that demand is credible, internal production could become increasingly attractive.

At 25,000 units, the simplified annual savings rise to $85,000.

But I wouldn’t stop at the annual cost comparison.

I’d want to know whether we have enough production capacity.

Would we need another shift?

Would quality control requirements increase?

Could we handle peak demand without delaying customer orders?

And what happens if the equipment breaks down?

There is a difference between having capacity on a spreadsheet and having capacity on a Tuesday afternoon when two people are out sick and a machine has decided to develop a personality.

Operations has a wonderful way of introducing itself into financial assumptions.

So I’d build the volume forecast alongside an operational capacity plan.

The two should agree.

Now Let’s Talk About the Cash Investment

Suppose the business also needs $120,000 upfront for installation, training, and initial setup.

For this example, assume that amount is a separate cash outlay and isn’t already included in the annual costs above.

At 20,000 units, recurring annual savings are $40,000.

Simple payback:

$120,000 ÷ $40,000 = 3 years

That’s useful information.

But it isn’t a complete investment analysis.

Simple payback ignores the time value of money, the timing of cash flows, and what happens after the payback period.

I’d also want to understand any additional inventory and working capital requirements, taxes, financing, equipment replacement, and residual value.

For a meaningful capital commitment, I’d normally look at discounted cash flows and net present value as well.

And I would compare the investment with other ways the company could use that cash.

Because the money isn’t sitting around with a little sign that says “Reserved for our exciting new production department.”

It has alternatives.

That’s an important part of the decision.

The Opportunity Cost Nobody Put in the Proposal

Here’s my favorite question in this entire analysis.

What else could we do with the resources?

Suppose bringing production in-house requires management attention, warehouse space, and technical staff that could otherwise support a profitable new product.

Imagine that alternative activity would generate $65,000 of additional annual contribution after its own incremental costs.

If the two activities compete for the same limited resources, we need to compare them.

Our in-house production proposal saves $40,000 annually at 20,000 units.

But if it prevents us from earning $65,000 elsewhere, the decision may actually leave the company $25,000 worse off relative to that alternative.

That’s an opportunity cost.

And it’s one of the reasons I don’t automatically equate lower operating costs with a better business decision.

Sometimes paying a supplier is the smartest thing you can do.

Not because your company is incapable of performing the work.

Because your company’s resources are more valuable somewhere else.

I find that distinction particularly important in growing businesses.

You can’t pursue every opportunity simultaneously.

Even if the PowerPoint presentation suggests otherwise.

What About Quality, Control, and Customer Experience?

Numbers matter enormously.

But I’m not going to pretend they answer everything.

Bringing work in-house can improve control over scheduling, product quality, customization, and customer responsiveness.

Outsourcing can provide specialized expertise, flexibility, and access to capabilities that would be expensive to build internally.

The right choice depends on what the business needs.

If a component is central to your product’s quality or competitive advantage, controlling its production might have strategic value.

If the activity is standardized and an outside provider performs it reliably, internalizing it might simply add complexity.

And if a supplier is consistently missing delivery commitments, the cheapest quoted price might not be the cheapest economic outcome.

I’d want to quantify late deliveries, rework, returns, expedited shipping, lost sales, and other measurable consequences wherever reliable data exists.

Then I’d assess the less easily quantified risks separately.

I don’t like assigning made-up dollar amounts to every concern just to make the spreadsheet appear comprehensive.

Sometimes the responsible thing is to say, “This matters, but we don’t yet have a defensible estimate.”

Finance is allowed to have judgment.

In fact, I recommend it.

When I’d Lean Toward Outsourcing

I’d be more inclined to outsource when demand is uncertain, volumes are relatively low, the work requires specialized capabilities, or flexibility is especially valuable.

I’d also consider outsourcing when internal capacity could be used for something with a stronger financial return.

And I’d pay attention to the cost of managing the supplier relationship.

Outsourcing doesn’t eliminate management responsibility.

It changes the nature of it.

You still need performance expectations, quality standards, reliable reporting, and a plan if the supplier doesn’t deliver.

Delegating an activity is not the same as delegating accountability.

A lesson familiar to anyone who has ever asked a child to clean their room.

Technically, the task has been assigned.

Whether the task has been completed is an entirely separate investigation.

When I’d Lean Toward Bringing the Work In-House

I’d be more interested in internal production when demand is reasonably predictable, volumes support the fixed investment, the organization has the necessary capabilities, and internal control creates meaningful value.

I’d also want the expected financial advantage to be large enough to compensate for the risks and additional complexity.

A $4,000 annual advantage isn’t necessarily compelling if the company must assume substantial operational responsibilities to achieve it.

An $85,000 advantage supported by stable demand and adequate capacity deserves a closer look.

But I would still test the assumptions.

Especially labor availability, production efficiency, startup costs, quality, and future capital requirements.

A business can absolutely improve its economics by bringing the right work in-house.

That’s worth getting excited about.

I just prefer excitement accompanied by a sensible financial model.

How I’d Present the Decision to Management

I wouldn’t make this a 40-slide presentation.

I’d build a concise decision summary that answers six questions.

1. What decision are we making?

Clearly define the activity, volume, alternatives, and time horizon.

2. What costs and benefits actually change?

Separate relevant costs from existing costs that remain regardless of the decision.

3. Where is the break-even point?

Show the volume or utilization level where one option becomes financially preferable.

4. What assumptions could reverse the recommendation?

Demand, supplier pricing, labor costs, production efficiency, implementation costs, and available capacity are good places to start.

5. What are the cash and operational implications?

Include upfront investment, working capital, quality, execution, and supplier-dependency considerations.

6. What would cause us to reconsider the decision later?

This last one is important.

Maybe management decides to continue outsourcing until annual demand consistently exceeds 18,000 units.

Or perhaps it approves internal production only after the company secures sufficient customer commitments.

Those are examples of decision triggers, not universal thresholds.

But they make the recommendation actionable.

And they allow management to revisit the decision when circumstances change.

Which, in business, they have a habit of doing.

A Good Make-or-Buy Decision Isn’t Always About Saving Money

Sometimes the best outcome is lower cost.

Sometimes it’s greater flexibility.

Sometimes it’s better quality, more control, or the ability to grow without investing heavily in additional infrastructure.

And sometimes the most valuable result of a make-or-buy analysis is discovering that an exciting idea isn’t quite ready yet.

I don’t consider that a failure.

I’d much rather identify a weak assumption before signing a lease, hiring a team, or purchasing equipment.

But when the numbers support the opportunity?

That’s when financial analysis becomes genuinely useful.

It gives management a reason to move forward with confidence.

Not blind confidence.

Earned confidence.

There’s a difference.

Thinking About Bringing Work In-House or Outsourcing Something New?

If you’re weighing an outsourcing proposal, building internal capabilities, or deciding where to invest as your business grows, the financial comparison is worth doing properly.

My Scenario Modeling & Decision Support services are designed to help businesses evaluate alternatives, understand the tradeoffs, and make decisions using financial assumptions they can actually defend.

Because “we think this will save money” is a perfectly reasonable place to begin.

I just wouldn’t make it the last line of the analysis.