Make or Buy Decision Excel Template
Compare in-house production with outsourcing and identify the lower-cost option at your actual production volume.
Relevant Costing · Crossover Volume · Cost Sensitivity
Quick Answer
What Is a Make or Buy Decision?
A Make or Buy decision is the process of deciding whether a business should produce a product, component, or service internally or purchase it from an external supplier.
The decision compares the relevant cost of making with the relevant cost of buying. Internal production may involve variable manufacturing costs and additional fixed costs, while outsourcing generally involves the supplier’s purchase price and other related costs.
The lower-cost option is not always the better business choice. Capacity, quality, delivery reliability, supplier dependence, flexibility, confidentiality, and long-term strategy may also affect the final decision.
Cost Comparison
Make or Buy: Which Costs Should Be Compared?
The financial comparison should focus on the costs that change between internal production and external purchasing. This helps prevent unavoidable accounting costs from distorting the decision.
Internal Production
Make Internally
- Variable manufacturing cost
- Additional labour and material cost
- Incremental fixed cost
- Avoidable operating expenses
- Opportunity cost of production capacity
External Purchasing
Buy From a Vendor
- Vendor purchase price
- Freight and delivery charges
- Inspection and quality-related costs
- Purchasing and coordination costs
- Supplier switching or implementation costs
The comparison should focus on costs that change between the two alternatives—not every cost recorded in the accounts. Existing costs that remain unchanged under both options generally should not determine the financial decision.
Relevant Costing
Which Costs Should Actually Influence the Decision?
A reliable Make or Buy analysis separates costs that change between the alternatives from costs that remain unchanged.
Include in the Analysis
Costs that are avoidable, incremental, or directly affected by the Make or Buy choice.
- Avoidable variable production costs
- Additional labour and material costs
- Incremental fixed costs
- Relevant logistics and operating costs
- Opportunity cost of limited capacity
Usually Exclude
Costs that continue regardless of whether the business makes or buys the product or service.
- Unavoidable allocated overhead
- Existing fixed costs that continue
- Historical or sunk costs
- Non-relevant accounting allocations
- Book values that do not change
Review Carefully
These items may be relevant depending on capacity, timing, and the terms of the decision.
- Depreciation and asset-related costs
- Shared overhead allocations
- Capacity constraints
- Opportunity costs
- Quality, warranty, and switching costs
If a cost remains unchanged under both alternatives, it generally should not determine the financial choice. Focus on the costs and benefits that differ between making and buying.
Workbook Workflow
From Cost Inputs to a Clearer Sourcing Decision
The workbook follows a structured process so you can enter assumptions, compare alternatives, test different volumes, and review the result.
Start Here
Enter Your Assumptions
Add production volume, internal variable cost, incremental fixed cost, vendor price, and other relevant inputs.
Compare
Calculate Both Options
Compare the relevant total cost of making internally with the estimated cost of purchasing from a vendor.
Test
Find the Crossover Volume
Identify the approximate production level at which the cost advantage changes between Make and Buy.
Review
Evaluate the Decision
Use sensitivity analysis and qualitative factors to assess whether the calculated recommendation is practical for your business.
The workbook supports the decision—it does not make the decision for you. Review capacity, quality, supplier reliability, strategic importance, and other business considerations before finalising the choice.
How the Template Calculates Make vs Buy Costs
The workbook compares the relevant cost of producing internally with the cost of purchasing from an external supplier. The calculation focuses on the costs that change because of the decision.
Making is cheaper than buying.
Buying is cheaper than making.
Both options have the same calculated cost.
Make Total Cost
Includes variable production costs and additional fixed costs that arise only when the item is produced internally.
Buy Total Cost
Calculates the external purchase cost using the supplier price and the quantity required for the period.
Monthly Cost Difference
A negative figure favours making, while a positive figure favours buying.
Annual Cost Difference
The annualised result helps estimate the yearly financial impact of selecting one option over the other.
Use relevant and avoidable costs in the comparison. Allocated fixed costs that will continue regardless of the decision should generally not influence the Make or Buy calculation.
Find the Crossover Volume Between Making and Buying
The crossover volume identifies the production quantity at which the total cost of making becomes equal to the total cost of buying.
The result represents the approximate volume at which both options have the same relevant cost.
Below the crossover volume
Buying may be more economical because the fixed cost of making is spread over a smaller quantity.
At the crossover volume
The calculated total cost of making and buying is approximately equal.
Above the crossover volume
Making may become more attractive when the lower variable cost offsets the additional fixed cost.
Crossover volume is meaningful only when the vendor purchase price is higher than the make variable cost. If buying is already cheaper on a variable-cost basis, the normal crossover calculation may not apply.
See How Changes in Cost and Volume Affect the Decision
A Make or Buy decision may change when production volume, internal costs, or supplier pricing changes. Sensitivity analysis helps test whether the recommendation remains stable under different scenarios.
Compare the result across different operating conditions
| Scenario | Production Volume | Make Total Cost | Buy Total Cost | Preferred Option |
|---|---|---|---|---|
| Lower Volume Fixed cost spread over fewer units | Reduced | May remain relatively high | Usually decreases with volume | Often Buy |
| Base Case Current entered assumptions | Expected | Based on entered make costs | Based on entered vendor price | Calculated Result |
| Higher Volume Fixed cost spread over more units | Increased | May benefit from lower unit economics | Increases with purchase quantity | Often Make |
| Vendor Discount Supplier offers a lower purchase price | Unchanged | Usually unchanged | May become more competitive | Review |
The workbook’s sensitivity analysis should be interpreted using the actual values entered in the input and sensitivity sections. The preferred option may change when assumptions move around the crossover volume.
A recommendation that changes easily with small assumption changes should be treated as sensitive. In such cases, operational reliability, quality, capacity, supplier risk, and strategic considerations become especially important.
Consider Operational and Strategic Factors Before Deciding
The lowest calculated cost may not always represent the best business decision. Capacity, quality, supplier dependence, confidentiality, and operational flexibility can materially affect the final choice.
Reasons to Consider Making
Existing facilities, employees, or equipment may be available to produce the item without major additional investment.
Internal production may provide greater control over quality, specifications, and process consistency.
Making internally may help protect designs, processes, formulas, technology, or proprietary information.
Internal production may strengthen technical knowledge and reduce dependence on external suppliers.
Reasons to Consider Buying
Outsourcing may release internal capacity for more profitable or strategically important activities.
Specialist vendors may offer better technology, experience, scale, or production efficiency.
Buying may provide faster access to products and allow capacity to adjust when demand changes.
External sourcing may avoid additional equipment, recruitment, maintenance, and long-term fixed-cost commitments.
Use the Excel calculation as the financial starting point, then combine it with operational and strategic judgement. A small cost advantage may not justify higher quality risk, supply uncertainty, loss of flexibility, or an excessive investment requirement.
Everything You Need for a Structured Make or Buy Analysis
The workbook brings assumptions, cost comparisons, crossover analysis, sensitivity testing, and practical guidance together in one organised Excel file.
A clear structure from assumptions to decision
Cover and Navigation
Provides the workbook title, purpose, and a simple starting point for using the model.
Setup Assumptions
Enter general assumptions such as decision period, tax rate, safety margin, and other reference inputs.
Product Inputs
Record production volume, make variable cost, incremental fixed cost, and the external vendor purchase price.
Make or Buy Comparison
Calculates make cost, buy cost, monthly difference, annualised impact, crossover volume, and the indicative recommendation.
Sensitivity Analysis
Tests how changes in volume, internal costs, or vendor pricing may affect the financial preference.
How to Use Guide
Explains the input process, calculation logic, result interpretation, and key decision limitations.
Who Can Use the Make or Buy Excel Template?
The Make or Buy Excel Template is designed for anyone who needs to compare in-house production with external purchasing using a structured Make or Buy Decision Analysis.
Whether you are evaluating manufacturing costs, outsourcing a component, comparing supplier quotations, or studying relevant costing, this Make or Buy Analysis Excel Template helps organise the assumptions and present the financial comparison clearly.
Decision-Making
Use Cases Compare cost, volume, capacity, and strategic considerations in one place.
Finance and Accounting Teams
Use the template for relevant costing, management accounting, cost comparison, budgeting support, and short-term decision analysis.
Manufacturing Businesses
Compare the cost of producing a component internally with the cost of purchasing it from a supplier or outsourcing partner.
Procurement and Purchase Teams
Evaluate vendor quotations against internal production costs before recommending an outsourcing or supplier purchase decision.
Operations and Production Managers
Assess capacity utilisation, incremental fixed costs, production volume, and the operational impact of making or buying.
Business Owners and Consultants
Use the Make vs Buy Calculator Excel model to support pricing, outsourcing, supplier negotiation, and resource-allocation decisions.
Students and Educators
Practise Make or Buy Decision Analysis, relevant costing, crossover volume analysis, and management accounting concepts.
This Make or Buy Cost Calculator is most useful when production volume, variable costs, incremental fixed costs, and supplier pricing can be reasonably estimated. The numerical result should be considered alongside quality, capacity, reliability, confidentiality, flexibility, and long-term strategic factors.
Important Assumptions Behind the Make or Buy Analysis
A reliable Make or Buy Decision Excel Template depends on realistic cost inputs, relevant assumptions, and a clear understanding of what the calculation does—and does not—measure.
Use Relevant and Avoidable Costs
Include costs that change between making and buying, such as variable production costs and incremental fixed costs. Unchanged allocated overheads should not automatically influence the decision.
Enter Realistic Production Volume
The Make or Buy Cost Calculator uses the entered volume to compare total making and buying costs. The result may change significantly when demand or capacity assumptions change.
Confirm Supplier Pricing
Vendor purchase prices should reflect the actual quotation or reasonable estimate, including relevant delivery, conversion, inspection, or other directly attributable costs where applicable.
Review Capacity and Fixed Costs
Incremental fixed costs should be included only when they arise because of the make decision. Existing unavoidable fixed costs should be treated separately.
Interpret the Crossover Volume Carefully
Crossover Volume Analysis is meaningful only when the relationship between the make variable cost and buy price supports a normal break-even calculation.
A lower calculated cost does not always mean the better business choice. Before choosing to make or buy, validate the assumptions and consider capacity, quality, delivery commitments, supplier dependence, flexibility, and long-term strategic impact.
How to Use the Make or Buy Excel Template
Follow these simple steps to complete a practical Make or Buy Decision Analysis using the Make or Buy Decision Excel Template.
Enter Your Assumptions
Open the Setup and Product Inputs sheets. Enter the tax rate, safety margin, make variable cost, and expected monthly volume.
Add Make and Buy Costs
Enter only the incremental fixed cost triggered by making and the vendor quote per unit. The template compares relevant costs for in-house production and outsourcing.
Review the Decision
Check Make Total Cost, Buy Total Cost, monthly cost difference, annual cost difference, and the recommended Make or Buy outcome.
Test Crossover and Sensitivity
Review crossover volume, qualitative factors, and sensitivity scenarios to understand whether the decision remains suitable when volume or costs change.
Download the Make or Buy Excel Template
Compare in-house production and outsourcing using relevant costs, incremental fixed costs, vendor pricing, crossover volume, and sensitivity analysis. Enter your assumptions and use the workbook to support a structured Make or Buy Decision Analysis.
Download Excel TemplateEditable and reusable Excel workbook for practical cost comparison, financial modelling, and management accounting analysis.
Make or Buy Excel Template FAQs
Explore common questions about Make or Buy decision analysis, relevant costing, outsourcing decisions, crossover volume, and using the Excel template for practical cost comparison.
01 What is a Make or Buy Excel Template?
A Make or Buy Excel Template is a financial analysis tool used to compare the cost of producing a product, component, or service internally with the cost of purchasing it from an external supplier. It helps calculate Make Total Cost, Buy Total Cost, monthly cost difference, annual cost impact, crossover volume, and sensitivity results.
02 What is a Make or Buy decision?
A Make or Buy decision determines whether a business should manufacture a product or component internally or purchase it from an outside supplier. The decision is generally based on relevant costs, available capacity, supplier pricing, quality, reliability, flexibility, and strategic considerations.
03 How does the Make or Buy Decision Excel Template work?
Enter the required assumptions, production volume, make variable cost, incremental fixed cost, and vendor purchase price. The workbook compares the total cost of making with the total cost of buying and presents the calculated cost difference, annualised impact, crossover volume, and sensitivity analysis.
04 What is the formula for Make Total Cost?
Make Total Cost is calculated by multiplying the make variable cost per unit by the required production volume and adding the incremental fixed cost.
05 What is the formula for Buy Total Cost?
Buy Total Cost is calculated by multiplying the supplier’s purchase price per unit by the purchase volume.
06 How is the Make vs Buy cost difference calculated?
The monthly cost difference is calculated by subtracting Buy Total Cost from Make Total Cost.
A negative result indicates that making is cheaper. A positive result indicates that buying is cheaper. A zero result means both options have the same calculated cost.
07 What are relevant costs in a Make or Buy decision?
Relevant costs are future costs that change depending on whether the business makes or buys the item. They may include variable production costs, avoidable labour, avoidable overheads, incremental fixed costs, supplier purchase prices, freight, inspection, handling, and other costs that differ between the two alternatives.
08 Should allocated fixed costs be included in Make or Buy analysis?
Allocated fixed costs should not automatically be included in a Make or Buy comparison. If an allocated cost will continue regardless of the decision, it is not relevant to the analysis. Only fixed costs that can be avoided, removed, or added because of the decision should generally be considered.
09 What is crossover volume in Make or Buy analysis?
Crossover volume is the production quantity at which the total cost of making equals the total cost of buying. It helps identify the volume level at which the financially preferable option may change.
This calculation is meaningful when the vendor purchase price is higher than the make variable cost per unit.
10 What does sensitivity analysis show in a Make or Buy decision?
Sensitivity analysis shows how the Make or Buy recommendation changes when important assumptions change. Common variables include production volume, make variable cost, incremental fixed cost, and vendor purchase price. It helps assess whether the decision remains attractive under different business conditions.
11 Is the cheaper option always the best Make or Buy decision?
No. Cost is important, but the final decision should also consider production capacity, quality requirements, supplier reliability, delivery timelines, confidentiality, technology, operational flexibility, strategic control, and long-term business impact. The lowest calculated cost may not always be the best overall option.
12 Who can use this Make or Buy Analysis Excel Template?
The template can be used by finance professionals, management accountants, manufacturing businesses, procurement teams, operations managers, business owners, consultants, students, and educators studying relevant costing or managerial decision-making.
13 Can this template be used for outsourcing decisions?
Yes. The Make or Buy Excel Template can support outsourcing decisions by comparing the internal cost of production with the external supplier’s quoted purchase cost. Supplier capacity, service levels, quality, logistics, contractual terms, and the long-term effect of outsourcing should also be reviewed.
14 Does the template provide a final business recommendation?
The workbook provides a cost-based indication of whether making or buying is financially more attractive under the entered assumptions. The final business decision should be reviewed alongside qualitative, operational, commercial, and strategic factors.
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Disclaimer
This Make or Buy Decision Excel Template is provided for educational, analytical, financial planning and business decision-making purposes only. The template uses user-entered product or service information, production volume, make variable costs, incremental fixed costs, vendor purchase prices, relevant cost assumptions, qualitative decision factors and other inputs to calculate and present indicative make-versus-buy cost comparisons, total make cost, total buy cost, monthly cost differences, annualised cost differences, crossover volume and related decision-support metrics.
The make or buy calculations, relevant cost analysis, make-versus-buy comparison, cost difference, estimated annual savings or additional cost, crossover volume, sensitivity analysis, qualitative assessment and other information generated by the template are based on the assumptions and data entered by the user and may not reflect actual production costs, supplier pricing or final business outcomes. Users should independently verify production volumes, variable costs, incremental fixed costs, vendor quotations, capacity availability, labour and material costs, avoidable and unavoidable expenses, supplier terms, quality requirements, delivery commitments, contractual obligations and other relevant assumptions before relying on the results. Actual costs, savings, profitability, operational efficiency and financial outcomes may vary due to changes in demand, production capacity, supplier pricing, input costs, quality issues, delays, inflation, scope changes, resource availability and other business circumstances.
The template does not constitute financial, accounting, investment, tax, legal, procurement, operational or professional advice. It does not guarantee cost savings, production efficiency, supplier performance, profitability or the achievement of any specific financial outcome. Users remain responsible for reviewing the calculations, validating the inputs, applying appropriate relevant-costing principles and evaluating the suitability of any make or buy, in-house production, outsourcing or procurement decision for their specific business circumstances.