Truck Accessories Discount Margin in New Zealand: How Much a Sale Really Costs

Start With the Margin You Are Protecting

Start with realised revenue: the amount earned from delivered orders after discounts, refunds and returns are accounted for. Cancelled orders are not revenue. Cost of goods sold (COGS) is the product cost attached to those sales, including the cost basis you use for each bull bar, canopy, lighting kit or accessory. Gross profit is revenue minus COGS. Gross margin is gross profit divided by revenue, expressed as a percentage.

Use gross margin to set a sustainable price and check whether a promotion leaves enough product-level room before other selling costs. Use contribution margin for promotion and order decisions because it subtracts variable costs that rise with the sale, such as advertising and any applicable payment, fulfilment or shipping costs in your model. A product can have a healthy gross margin but weak contribution after acquisition costs. For a single order, contribution dollars often matter more than percentage: a $40 contribution may be preferable to a 30% margin on a small order, depending on your fixed-cost structure. ORVX computes COGS, gross profit and their margins, and reports contribution after advertising by product and collection. You can also test price inputs with the product pricing calculator.

Why a Discount Hits Profit Harder Than Revenue

A discount reduces the revenue available to cover each order’s costs, but it does not automatically reduce the cost of picking, packing, shipping, or acquiring that customer. If a truck accessory sells for $200, with $100 product cost, $20 fulfilment cost and $30 advertising cost, $50 remains as contribution before fixed overheads. A 10% discount reduces the selling price to $180. The same costs then leave only $30. You have removed 40% of the contribution, not 10%.

That changes the number of orders required to produce the same contribution. The example below assumes demand remains sufficient to generate the replacement orders; it does not predict that a discount will create them. A discount that appears modest in revenue terms can therefore require a much larger increase in order volume. Use contribution per order when deciding whether a promotion can pay for itself; use net profit and margin when checking whether the store remains viable after overheads and other operating costs.

The calculation should use realised revenue from delivered orders, with refunds and returns reflected, rather than treating every placed order as successful revenue. Product-level reporting is also important: a discount may be tolerable on one high-margin accessory and damaging on another.

How to Read the Worked Discount Example

Read the worked example from left to right. The original price is the starting point, not the amount the store ultimately earns. Apply the discount to that price to get the realised selling price, then multiply it by the number of delivered orders to calculate discounted revenue. This keeps the calculation tied to completed sales rather than assumed demand.

Next, follow the product-cost line separately. Subtract the cost of the products sold from discounted revenue to see what remains before the other costs included in the example. The profit line then shows the result after those costs. Compare it with the no-discount case to isolate the profit change caused by the promotion. A smaller revenue decrease can still produce a larger percentage decrease in profit when the original margin is narrow.

The final step translates that lost profit into an order target. Divide the profit given up on existing orders by the profit earned from one additional discounted order, then round up to a whole order. Do not divide lost revenue by the discounted price: the replacement orders must cover profit, not just sales value. Use the product pricing calculator to test different prices, costs and order volumes, then check actual product and collection profitability before acting.

How Tax Interacts With a Discount

For a GST-registered store, separate the amount the customer pays from the sale value the store retains. Inland Revenue (Te Tari Taake) states that “GST in New Zealand is charged at a rate of 15%.” If a truck accessory is priced at $115 including GST, the customer pays $115, but the store’s GST-exclusive revenue is $100 and $15 is GST collected for the tax authority (Source: Inland Revenue (Te Tari Taake)).

A 10% discount changes each figure: the customer pays $103.50, made up of $90 GST-exclusive revenue and $13.50 GST. The store has therefore retained $90 before product cost, fulfilment, advertising, refunds and other costs, not $103.50. Compared with the original $100 revenue, the promotion reduces revenue by $10, even though the customer’s cash saving is $11.50.

Use the tax-inclusive view to check the price shown to shoppers, checkout cash collected and the visible size of the offer. Use the tax-exclusive view to evaluate gross profit, contribution after advertising and margin, because those measures should compare retained revenue with costs on the same basis. For a consistent before-and-after check, the product pricing calculator can help separate displayed price, discount and GST.

Alternatives to a Straight Discount

Match the incentive to the cost problem rather than applying the same percentage to every order. A bundle can preserve the headline price of the main product while adding an item with spare margin. A spend threshold is intended to lift basket value, but only helps if the extra product margin covers the added fulfilment cost. Included accessories suit products where a low-cost add-on improves perceived value without materially increasing freight. A shipping offer addresses delivery friction, but the subsidy must be measured against the order’s actual freight cost. Targeted incentives restrict the margin reduction to a defined customer, product or campaign group instead of reducing revenue across the whole store.