Dropshipping Fashion Customer Acquisition Cost in Singapore: What You Can Afford

What Belongs in Customer Acquisition Cost

Customer acquisition cost (CAC) is the cost assigned to winning one new customer: attributable acquisition spend divided by the number of first-time customers acquired in the same period. Include paid social and search, affiliate or creator commissions, campaign-specific creative, and agency or platform fees that support acquisition. Include a cost only when you can link it to acquiring customers; otherwise, keep it in general marketing overhead.

Keep CAC separate from the costs of serving the order. Product cost, supplier charges, fulfilment, shipping, payment processing, refunds, and returns belong in margin or contribution analysis, not acquisition cost. General salaries, rent, and software also stay outside CAC unless you deliberately allocate them for a separate fully loaded analysis. Decide whether figures are GST-inclusive and apply that basis consistently; Singapore’s current GST rate is 9% (Inland Revenue Authority of Singapore). For a clean baseline, use the CAC calculator (Source: Inland Revenue Authority of Singapore).

First-Order Margin Sets the Initial Ceiling

For immediate first-order payback, the defensible CAC ceiling is the order’s contribution margin before advertising. It is the money left after variable costs required to deliver that order, product cost, fulfilment or shipping, payment fees, discounts and expected order-level returns, before deducting CAC. Paying more than this means the first order loses money even if the store shows sales growth. Use the CAC calculator to test the calculation.

Do not use revenue as the ceiling. Revenue is what the sale generates, not what remains to acquire the customer. Where Singapore GST applies, the current rate is 9% (Inland Revenue Authority of Singapore). A customer payment of S$109 therefore represents S$100 of revenue before GST, not S$109 available for ads. If variable costs total S$43, first-order contribution is S$57, making S$57 the maximum CAC for immediate payback (Source: Inland Revenue Authority of Singapore).

Gross margin is narrower: it usually subtracts product cost from revenue and may omit shipping, payment fees, discounts and returns. Accounting profit goes further by including operating overheads such as salaries, software and rent. Use contribution margin to set an immediate acquisition limit; use accounting profit to judge whether the whole business is viable.

How to Read the Worked Example

Read the calculation left to right: selling price, whether before or after Singapore GST, and the stated revenue basis; GST collected is not product revenue. The current GST rate in Singapore is 9%, according to the Inland Revenue Authority of Singapore. Add product, fulfilment or shipping, payment, expected refunds or returns, and other variable costs, then subtract them from revenue for first-order contribution margin. If shown, divide it by selling price for the margin percentage: the currency amount shows contribution, while the percentage shows efficiency. Apply contribution to advertising under the payback assumption for allowable CAC, keeping the measures separate. Reproduce the sequence in the CAC calculator (Source: Inland Revenue Authority of Singapore).

Repeat Orders Change the Amount You Can Pay

Later contribution can support a higher acquisition limit when probable. Assume S$18 first-order contribution; 40% place a second order contributing S$22: expected repeat contribution is 0.40 × S$22 = S$8.80, making planned customer contribution S$26.80. A S$20 CAC limit leaves S$6.80 for forecasting error, weaker cohorts or returns. Compare this with observed repeat behaviour; not every acquired customer repeats.

That limit is separate from cash. With S$500 cash, it supports S$500 ÷ S$20 = 25 new customers today. Future S$8.80 per customer cannot pay this week’s ad invoices without working-capital capacity or credit. Use customer value for viability and cash for immediate spending. ORVX shows customer-level profitability and repeat behaviour; use its CAC calculator to model the limit.

Track CAC by Channel and Customer Cohort

Blended CAC divides total acquisition spend by all first-time customers in the period. Use it for the store-wide budget and cash-efficiency view: if blended CAC rises, the overall acquisition model needs attention, even when one channel looks healthy. It can, however, hide expensive channels behind efficient ones.

Channel CAC divides each channel’s spend by the new customers attributed to it. Use this measure when deciding where to scale, reduce, or investigate tracking. Compare it with that channel’s contribution after advertising, not CAC alone; attribution rules and small customer counts can distort short-term results. MER and attributed ROAS should remain separate views rather than substitutes for CAC.

Cohort CAC groups customers by acquisition period, and optionally by channel, then follows their delivered-order revenue, repeat behaviour, returns, and profitability. Use it to judge whether a January acquisition cost is supported by later customer value. Do not act aggressively on an immature cohort with few repeat opportunities. ORVX shows customer-level profitability and repeat behaviour, helping compare mature cohorts without treating one universal CAC figure as correct.

Turn the Calculation Into a Spending Rule

Set a planned CAC from expected contribution and the maximum payback period, then compare it with realised CAC after delivered orders, returns and cancellations. Planned performance supports budgeting; realised performance decides whether spend stays. Use attributed CAC for channel optimisation, but check blended CAC and MER for the store-wide cash decision. ORVX keeps MER and attributed ROAS separate, and reports contribution after advertising by product and collection.

• Scale only when realised CAC is below the planned limit, payback arrives within the cash window, and attribution is credible across more than one review period.
• Hold spend when CAC is near the limit, payback is slower than planned, or attributed results differ materially from blended CAC. Gather more delivered-order data.
• Reduce or stop when realised CAC exceeds the limit after returns, contribution is negative, or repeat behaviour does not support the assumed payback. ORVX surfaces a deterministic decision with its reason and confidence. Use the CAC calculator when margins change.

A sustainable CAC for a Singapore fashion dropshipping store is not a fixed market benchmark. It is a decision limit built from contribution margin, repeat-order economics and channel-level evidence, then updated as product costs, customer behaviour and cash requirements change.