What a Return Really Costs
The cost of a returned order is not the refund alone. Start with the cash refunded to the customer, then add costs caused by the return: outbound freight that cannot be recovered, return freight, payment fees retained by the processor, customer-service and warehouse labour, inspection, cleaning, repackaging and relabelling. Add any write-off or markdown when the product, packaging or included consumables cannot be sold as new.
Then subtract the recovered resale value. A sealed microfiber kit that returns to sellable stock may recover most of its product value; an opened polish, leaking bottle or damaged carton may recover only a discounted amount, or nothing. Use the value you can reasonably recover through resale, not the original selling price. Keep GST treatment consistent with your accounting records; Inland Revenue states that GST in New Zealand is charged at 15% (Source: Inland Revenue (Te Tari Taake)).
A practical calculation is: net return cost = refund + incremental freight and payment costs + return-handling labour and processing costs + write-off or markdown − recovered resale value. Exclude rent, software subscriptions, salaries and other overheads that stay the same whether this order is returned. Those belong in overall profitability, not the marginal cost of this return.
| Measure | What it includes | When it is useful |
|---|---|---|
| Refund value | Amount returned to the customer | Shows cash refunded, but not the full loss |
| Gross return cost | Refund plus return-related costs before recovery | Shows the cost before resale value is considered |
| Net return cost | Gross return cost minus recovered resale value | Shows the economic cost to use in profitability analysis |
Build a Return Cost Model You Can Act On
Build the model at order level, then aggregate it by product, collection, channel and month. Keep GST treatment consistent: Inland Revenue states that GST in New Zealand is charged at 15%, so compare either GST-inclusive cash movements or GST-exclusive profitability, not a mixture. For a $120 GST-inclusive sale, the comparable GST-exclusive revenue is $104.35 (Source: Inland Revenue (Te Tari Taake)).
Use four measures together. Cost per returned order shows the cash and handling burden of each return. Unrecovered revenue shows how much of the original sale was not recovered through resale or other recovery. Contribution margin shows whether the order still covered product cost and variable selling costs after the return. Recovery value shows what the returned item actually generated, rather than assuming its original selling price.
For illustration only, if a returned order produced $104.35 ex GST, had $45 product cost, $10 outbound freight, $12 return freight and $5 processing, and was resold for $60, the model should record the $60 as recovery value and test the remaining economics, not label the full original sale as retained revenue. Apply the same definitions to every order so product comparisons are actionable.
| Measure | Calculation | Use it to act on |
|---|---|---|
| Cost per returned order | Refund or credit + return-related costs − recovery value | Compare the operational burden of returns by product or channel. |
| Unrecovered revenue | Original revenue − recovery value | Identify where refunds leave the largest revenue gap. |
| Contribution margin after return | Realized revenue − product cost − variable selling and return costs | Decide whether the order still contributes after the return. |
| Recovery value | Cash sales or credit obtained from the returned item | Test resale, discounting or disposal decisions using actual value. |
Worked example with sample numbers
This example is illustrative. It uses sample numbers for a car care products store selling in New Zealand. They are made up to show the method, they are not a benchmark, and your own figures will differ.
Formula: Cost per order sold = return rate x (delivery both ways + packing + value lost on resale).
| Return rate | Cost per order sold | Left over |
|---|---|---|
| 5.0% | NZ$2.05 | NZ$22.24 |
| 10.0% | NZ$4.11 | NZ$20.19 |
| 20.0% | NZ$8.22 | NZ$16.08 |
| 30.0% | NZ$12.33 | NZ$11.97 |
Run the same sum with your own numbers in the free calculator, or browse guides for sellers in New Zealand and more car care products guides.
General information only: tax, duty and import rules change and depend on your situation, so check with an accountant or the official source before acting.
Eligible Shopify stores can see these numbers for their own store through the Founding 10,000 offer.
How to Read the Worked Example
Read the worked example from left to right. First identify the order inputs: the customer’s paid price, GST treatment, product cost, outbound freight, return freight, payment fees, handling time and any value lost if the item cannot return to saleable stock. Keep the example’s currency and tax basis unchanged. If prices are GST-inclusive, do not compare them with costs recorded exclusive of GST. Inland Revenue states that GST in New Zealand is charged at a rate of 15% (Source: Inland Revenue (Te Tari Taake)).
Then separate two views. Cash paid is the money that leaves the business now: the refund, freight, fees, labour and any disposal or repackaging payment. Margin lost is the profit that the order would have contributed but no longer does. A returned product may recover some cost if it is resold, so cash paid and margin lost will not necessarily match. Follow the example’s treatment of recovered stock rather than adding a second loss for the same item.
The final return-rate tolerance is a decision threshold, not a New Zealand benchmark. It shows the return rate at which the example’s return cost consumes the available order contribution. Compare your actual return rate with that threshold using the same unit, units or refund value, and the same revenue definition. If your inputs differ, recalculate them in the profit margin calculator; do not apply the example’s result as a target for another store.
Local Consumer Rules to Confirm in New Zealand
Before publishing a returns policy, separate a change-of-mind return from a legal remedy. Ask whether the product was faulty, unsafe, materially different from its description or failed to perform as promised. Then confirm what remedy may apply, who pays reasonable return freight, and whether the store can offer repair, replacement or a refund under the circumstances. Do not assume that a customer’s preferred remedy is always the required one.
A store policy cannot remove consumer rights that apply. Check the official Consumer Protection guidance and the New Zealand legislation before relying on a rule. For GST treatment, confirm the current position with Inland Revenue, including whether the store’s obligations differ for imported low-value goods.
- Ask whether the sale was made directly, through a marketplace, or by an overseas merchant, and which party is responsible for the customer remedy.
- Confirm what evidence is reasonable: proof of purchase, photos, batch details, or inspection, and avoid making the process harder than the law permits.
- Record separate policy outcomes for change of mind, transit damage, faulty goods, incorrect goods and unsafe goods.
- Check Inland Revenue’s GST guidance and its guidance on GST for low-value imported goods, then have a New Zealand adviser review unusual cases.
Which car care products returns can be resold
Resellability depends on condition, contamination risk and whether the item can be sold exactly as described. A returned product should not go straight back into available stock because the customer says it was unused. Inspect the product and packaging, then assign a clear disposition.
For car care stores, sealed bottles of shampoo, polish, wax, coatings and cleaners are generally the simplest candidates for full-price resale when the seal, label and container are intact. Microfibre cloths, applicators and brushes need more caution if opened or used. Aerosols, electrical tools and products showing leakage, damage or tampering should be isolated until assessed. A partial bundle should only be split if each remaining item is complete and saleable.
- Restock: factory-sealed, clean, undamaged and correctly labelled.
- Discount or open-box: packaging damaged but the product is verified, complete and accurately described.
- Do not resell: used, contaminated, leaking, tampered or unverified products.
- Record the disposition and reason against the SKU. This lets you compare return rates with remaining stock value, dead stock and product-level profitability in ORVX.
| Condition | Typical action |
|---|---|
| Sealed and undamaged | Return to sellable stock |
| Opened packaging, product verified | Consider an accurately described discount |
| Used, leaking or contaminated | Keep out of sellable inventory |
Sources
- GST (goods and services tax) (Inland Revenue (Te Tari Taake), checked 26 October 2026).
- Registering for GST (Inland Revenue (Te Tari Taake), checked 26 October 2026).
- GST on low-value imported goods (Inland Revenue (Te Tari Taake), checked 26 October 2026).
How this page was made: drafted with AI from a brief, then checked by automated rules for arithmetic, sources and duplication. The sample numbers were calculated, not reported.