Break-even Analysis

The decision between an in-house warehouse and a fulfillment service provider is one of the most important strategic choices in e-commerce. A sound break-even analysis provides the objective basis for determining at what order volume an in-house warehouse becomes economically viable – and when outsourcing remains the better choice. Without this calculation, retailers risk investing in expensive infrastructure too early or paying unnecessarily high 3PL fees for years.

What is a break-even analysis in the fulfillment context?

The break-even analysis determines the point at which the total costs of two alternatives are equal. In the fulfillment area, you typically compare:

• In-house warehouse: High fixed costs, lower variable costs per order
• 3PL / fulfillment service provider: Low fixed costs, higher variable costs per order

Above the break-even point, the in-house warehouse is cheaper. Below it, outsourcing pays off. The analysis does not replace a strategic decision, but it creates transparency about the economic threshold.

The basic formula

The central formula is:

Break-even quantity = fixed cost difference ÷ variable cost difference per order

Specifically:

Fixed costs in the in-house warehouse

Fixed costs are incurred regardless of order volume. These include:

1. Warehouse rent and utilities
2. Base salary for warehouse staff (full-time equivalents)
3. WMS software and IT infrastructure
4. Depreciation on racking, packing tables and equipment
5. Insurance and operating costs
6. Proportional administrative costs

Variable costs per order

Variable costs increase with each additional order. In the in-house warehouse, they include:

1. Packaging material per shipment
2. Shipping costs (carrier rates)
3. Proportional labor costs for pick, pack and ship
4. Returns processing (quota-based)
5. Labels, inserts and consumables

With 3PL providers, fixed and variable costs are often combined in a flat rate per order or per SKU – separating them requires a detailed quote analysis.

Cost comparison: in-house warehouse vs. 3PL

Practical example: online shop with 800 orders per month

A mid-sized e-commerce retailer with an average of 3.2 items per order and a 12% return rate calculates as follows:

In-house warehouse assumptions

Total fixed costs in-house warehouse: 12,800 EUR/month
Variable costs in-house warehouse: 6.00 EUR/order

3PL assumptions

Total fixed costs 3PL: 389 EUR/month
Variable costs 3PL: approx. 8.88 EUR/order (incl. return share)

Break-even calculation

At 800 orders per month, the retailer is well below the break-even point. The 3PL model is significantly cheaper in this scenario. Only from around 4,300 orders per month would the in-house warehouse pay off.

Step by step: how to conduct the analysis

Step 1: Capture actual data from the last 12 months

Collect real figures from accounting, WMS and shipping software. No estimates – the accuracy of the analysis depends directly on data quality.

Step 2: Cleanly separate fixed and variable costs

Not every item is clear-cut. Example: A warehouse worker spends 60% on order picking (variable) and 40% on inventory counts (fixed). Allocate such mixed costs proportionally.

Step 3: Compare 3PL quotes in a structured way

Request at least three quotes and break them down into fixed and variable components. Watch for hidden costs: goods receipt, returns, peak surcharges, minimum volumes.

Step 4: Calculate and document break-even

Use the formula and record all assumptions in writing. This allows you to quickly update the analysis when framework conditions change.

Step 5: Conduct sensitivity analysis

What happens at ±20% order volume? With rent increases? With staff shortages and overtime? Create at least three scenarios: pessimistic, realistic, optimistic.

Step 6: Include non-monetary factors

The break-even analysis only reflects costs. Control over quality, brand image during unboxing, flexibility for special promotions and data sovereignty are strategic factors that belong in the overall decision.

What data you need

Checklist: data for the break-even analysis

• Monthly warehouse rent and utilities for the last 12 months
• Warehouse personnel costs (incl. employer contributions)
• Software costs (WMS, shipping software, ERP)
• Average orders per month (min, max, median)
• Average items per order
• Packaging costs per shipment (material + labor time)
• Shipping costs per shipment (by carrier and zone)
• Return rate and returns processing costs
• Investment costs and planned depreciation period
• At least one detailed 3PL quote with price breakdown

Common mistakes in break-even calculation

1. Only comparing the 3PL flat rate: Many providers quote "from X EUR per order". Without breaking down fixed and variable costs, no valid comparison is possible.
2. Underestimating personnel costs: In addition to gross salary, social security contributions, training, sick leave and recruitment costs apply. Calculate at least a 25–30% markup on pure wages.
3. Forgetting investments: Racking systems, packing tables, scanners and pallet trucks are not running costs, but must flow into fixed costs over the depreciation period.
4. Ignoring peak seasons: An in-house warehouse that works on average can become significantly more expensive during the Christmas season with overtime and temporary staff.
5. Not planning for growth: The break-even shifts downward when fixed costs decrease through economies of scale – but also upward when you invest too much too early.

Consider scenarios and growth

Plan growth scenario

If your shop grows 30% annually, calculate the break-even not only for today, but for the next 18–24 months. You may reach the profit threshold faster than expected – or a hybrid model (small in-house warehouse + 3PL overflow) is the smarter interim solution.

Include hybrid models

The decision does not always have to be binary. Many retailers store standard items in-house and outsource bulky goods, international shipments or peak overflow to a 3PL partner. The break-even analysis can be extended with a third cost line.

When the break-even analysis is not enough

The calculation answers the question "From when is it cheaper?" – not "Should I do it?". Additional factors:

• Capital commitment: Can you invest 50,000–200,000 EUR in warehouse infrastructure?
• Core business: Is logistics your competitive advantage or a distraction from the product?
• Geography: Is your warehouse optimally located for customers and suppliers?
• Compliance: Do you need special licenses (food, hazardous goods)?

For a holistic assessment, combine the break-even analysis with the pros and cons analysis and the question When is in-house warehousing worthwhile.

Tools and templates

For the calculation, the following are suitable:

1. Excel or Google Sheets with separate tables for fixed and variable costs
2. Fulfillment calculators from individual 3PL providers (as a comparison basis, not as the sole source)
3. ERP/WMS reports for real costs per order and per SKU

The detailed comparison of in-house warehouse and 3PL can also be found in the article Break-even in-house warehouse vs. 3PL. The article In-house vs. outsourcing provides fundamentals on model comparison.

Conclusion

The break-even analysis is the mathematical backbone of every in-house warehouse decision. It shows transparently at what order volume the investment in your own logistics infrastructure pays off. Complete data, clean separation of fixed and variable costs, and realistic 3PL quotes are crucial. Combine the calculation with strategic considerations on growth, capital and core business – and update the analysis at least once a year or when rent, personnel or order volume change significantly.

For the cost side of the location, it is worth looking at rent and operating costs – a key lever that can significantly shift the break-even point.

Related topics

• Pros and cons of in-house warehouse
• When is in-house warehousing worthwhile
• Break-even in-house warehouse vs. 3PL
• In-house vs. outsourcing
• Rent and operating costs

Last updated: July 6, 2026