Last Updated on July 1, 2026 by
Shipping delays. Mispicked orders. A warehouse bursting at the seams heading into peak season. If any of this sounds familiar, you are not alone. Logistics is one of the fastest ways growing eCommerce businesses quietly bleed cash and lose customers at the same time.
For many Australian online retailers hitting their growth stride in 2026, the question is no longer whether to consider a third party logistics provider. It is whether the numbers actually stack up.
This article walks you through a practical cost-benefit framework so you can make the call with confidence, not guesswork.
What is a 3PL?
You did not start your eCommerce business to become an expert in warehousing and fulfilment. Most Founders did not.
Third party logistics, or 3PL, refers to outsourcing your warehousing, picking, packing and shipping to a specialist provider. Rather than managing your own warehouse operation, a 3PL handles the physical side of your fulfilment on your behalf.
The appeal is straightforward. You free up time and headspace to focus on the parts of the business that actually drive growth: product, marketing and customer experience. The 3PL handles the rest.
The Cost-Benefit Analysis of Using a 3PL
Every eCommerce business running its own warehouse operation carries a base level of fixed costs. Rent, wages, on-costs, equipment, insurance. These expenses sit on your books whether you ship 500 orders that month or 5,000.
A 3PL flips the model. Instead of fixed overhead, you pay per unit. The cost scales with your volume, which means you are not absorbing idle capacity during slow periods or scrambling to hire when demand spikes.
The catch is that 3PLs need to make margin too. Their per-unit rates are priced to cover their overheads and profit. So the question is not simply whether outsourcing is neater operationally. It is whether the all-in cost per unit is lower than what you are currently carrying in fixed costs.
Every growing retailer will reach an inflexion point where a 3PL becomes more economical than insourcing. The steps below will help you find yours.
How to Find Your Inflexion Point
Step 1: Quantify the fixed costs of your current fulfilment operation
Pull up your monthly profit and loss statement for the last 12 months and identify every cost tied to your current fulfilment setup. This typically includes:
- Shipping and postage to customers
- Wages for warehouse, packing and delivery staff
- On-costs associated with staff (training, bonuses, sick leave provisions)
- Warehouse rent
- Warehouse on-costs including electricity and insurance
- Depreciation on any warehouse equipment or forklifts
Step 2: Calculate your average fixed cost per unit sold
Export a unit sales report from your eCommerce platform showing total units sold per month for the last 12 months.
Divide your total fixed logistics cost by the total units sold for each month.
Once you have that number, plug it into the calculator below alongside your 3PL rate card to instantly see how the two models compare.
Should you use a 3PL?
Enter your current fulfilment costs and a 3PL rate card to find the volume at which one model becomes more economical than the other.
Step 3: Get your 3PL rate card
Any 3PL provider will give you a rate card, essentially a menu of per-unit costs covering storage, pick and pack, dispatch and returns handling.
Use the unit sales data from Step 2 to model the total cost under the 3PL structure. If you are comparing multiple providers, be aware that rate card formats vary significantly. Some include returns handling in their base rate; others charge separately. Make sure you are comparing on a consistent basis before drawing any conclusions.
Step 4: Compare total costs under each scenario
With both sets of numbers in hand, compare the total cost per unit under your current setup against the 3PL rate. At your current volume, which is cheaper?
Then project forward. As your order volume grows, how does each model behave? Your fixed costs stay relatively flat, meaning cost per unit drops as you scale. Your 3PL cost, by contrast, scales linearly. The crossover point is your inflexion point.
Forecasting When to Make the Switch
Finding the inflexion point requires some forecasting. The good news is that by completing the steps above, you already know the throughput capacity of your current operation, meaning how many units your team can fulfil per head.
Use that benchmark to model how many additional staff and how much additional space you would need as sales grow. Stack that against the 3PL rate at the same projected volumes. The point where the 3PL model becomes cheaper is the trigger.
2026 context: Labour costs are a growing variable in this calculation.
With minimum wage increases effective from 1 July 2026 and ongoing upward pressure on casual and part-time rates, the fixed cost of running an internal warehouse team is rising. For businesses in high-volume fulfilment, this is shifting the inflexion point earlier than it would have been two or three years ago.
The Non-Financial Considerations
The numbers matter, but they are not the whole picture. Before committing to a 3PL, factor in the following:
- Existing lease obligations on your warehouse
- The people implications of making warehouse staff redundant
- The time and effort involved in finding the right 3PL partner
- Reduced quality control over how orders are picked and packed
- Less flexibility to personalise orders for repeat customers with handwritten notes, gifts or tailored packaging
Moving to a 3PL is a significant strategic decision. It is not something to do half-heartedly or purely because the warehouse is getting messy. The financial case needs to be clear, and the operational risks need to be understood before you make the call.
In Summary
A 3PL can be a powerful tool for scaling eCommerce operations without letting logistics overhead eat your margins. But the decision needs to be grounded in your actual numbers, not just a feeling that things are getting complicated.
Use the four-step framework above to find your inflexion point, factor in the non-financial considerations, and make the call based on data rather than frustration.
If you want support building out the financial model or understanding what the numbers mean for your specific business, the team at SBO Financial can help.
Frequently Asked Questions
👉 Want to know whether the 3PL numbers stack up for your business? We work with high-growth eCommerce businesses across Australia to model exactly these kinds of decisions, so you can move forward with confidence.
