What a payment fee actually includes
A customer’s payment cost is rarely just one percentage. The percentage charge is calculated on the transaction value, while a fixed charge applies once per order. A payment gateway may charge either component directly, or the store platform may bundle gateway processing into its own transaction fee. A separate platform fee can also apply for using a payment feature, subscription tier or external gateway. These structures are not identical: one provider may combine charges, while another may show them as separate invoice lines.
Tax and currency charges need their own treatment. GST may be added to the provider’s fee rather than deducted from the customer’s order value. IRAS states, “The current GST rate in Singapore is 9%.” A currency-conversion fee or exchange-rate spread may appear when the customer pays in one currency and the provider settles in another; the detailed impact belongs in the currency-conversion analysis. For a home goods store, record each line separately before calculating net sales and margin. The profit margin calculator is useful for testing those assumptions (Source: Inland Revenue Authority of Singapore).
| Charge | What it measures | When to act on it |
|---|---|---|
| Percentage | Variable cost tied to order value | Compare against gross margin on each order |
| Fixed fee | Flat cost applied per transaction | Include when assessing order economics |
| Platform or gateway fee | Access or processing cost, bundled or separate | Check the invoice and contract structure |
| Tax | Tax applied to an eligible fee | Record separately from the underlying charge |
| Currency conversion | Fee or exchange-rate spread between currencies | Review when payment and settlement currencies differ |
Why low-value orders suffer most
Low-value home goods orders absorb a larger payment cost because the fixed charge does not shrink with the basket. For illustration only, a S$0.30 charge is S$0.30 ÷ S$10 = 3% of a S$10 order, but S$0.30 ÷ S$120 = 0.25% of a S$120 order. The percentage fee behaves differently: in the illustrative schedule below, a 2.9% fee is S$10 × 2.9% = S$0.29 on a S$10 order and S$120 × 2.9% = S$3.48 on a S$120 order, while its share of revenue remains 2.9%.
The table uses an illustrative fee schedule of 2.9% plus S$0.30 per successful payment. On a S$10 order, the total fee is (S$10 × 2.9%) + S$0.30 = S$0.59, or S$0.59 ÷ S$10 = 5.9% of revenue. On a S$120 order, it is (S$120 × 2.9%) + S$0.30 = S$3.78, but only S$3.78 ÷ S$120 = 3.15%. That difference can decide whether a low-priced cushion cover or kitchen accessory remains profitable after product cost, shipping and advertising. Use the profit margin calculator to test your actual order values and fee schedule.
| Order value | 2.9% fee | Fixed fee | Total fee | Effective fee rate |
|---|---|---|---|---|
| S$10 | S$0.29 | S$0.30 | S$0.59 | 5.90% |
| S$30 | S$0.87 | S$0.30 | S$1.17 | 3.90% |
| S$60 | S$1.74 | S$0.30 | S$2.04 | 3.40% |
| S$120 | S$3.48 | S$0.30 | S$3.78 | 3.15% |
Worked example with sample numbers
This example is illustrative. It uses sample numbers for a dropshipping home goods store selling in Singapore. They are made up to show the method, they are not a benchmark, and your own figures will differ.
Formula: Payment fee = order value x percentage + fixed amount.
| Order value | Fee | Fee as share of order |
|---|---|---|
| S$10.00 | S$0.65 | 6.5% |
| S$20.00 | S$0.91 | 4.5% |
| S$39.99 | S$1.43 | 3.6% |
| S$119.97 | S$3.50 | 2.9% |
Run the same sum with your own numbers in the free calculator, or browse guides for sellers in Singapore and more dropshipping home goods 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 margin example
Read the worked example from left to right. Start with the order value: the amount charged for the home goods order before the payment fee is removed. The fee amount then combines the percentage-based charge on that order value with the fixed per-order charge. Subtract the full fee from the order value to reach net payment, the cash left from the transaction before product, fulfilment and marketing costs.
Contribution margin follows a different question: what remains after deducting the product cost, shipping and advertising cost from net payment. Follow the arithmetic in that order rather than treating the fee as part of product cost. The profit margin calculator can help check the same sequence with your own order assumptions.
To isolate a payment-fee change, keep the order value, product cost, shipping and advertising cost unchanged. A different fee rate changes the fee amount, net payment and contribution margin; it does not change the other inputs. A product-cost change reduces contribution margin while leaving net payment unchanged. A shipping change or advertising change behaves the same way: contribution changes, but the payment calculation does not. If the order value changes, the percentage part of the fee may change even when the provider's rate has not. That is an order-value effect, not evidence of a rate change. Compare both the dollar contribution and the contribution margin so a larger basket is not mistaken for stronger economics.
Refunds, chargebacks and currency conversion
A refund does not always reverse the full payment cost. Check the provider’s terms for three separate items: whether the percentage fee is returned, whether the fixed processing fee is retained, and whether any GST was charged on the fee. Singapore’s current GST rate is 9%, according to IRAS/basics-of-gst/current-gst-rates). For a S$100 home goods order, a retained S$0.30 fee means the customer receives S$100 while the store still absorbs that cost, before product return shipping or supplier charges (Source: Inland Revenue Authority of Singapore).
A chargeback is a different event from a voluntary refund. If the dispute is lost, the payment may be reversed and a separate chargeback fee may apply. If the dispute is won, the original payment may remain, but the provider’s rules determine whether the dispute fee is returned. Track chargeback value, fees and the affected order separately from ordinary refunds; acting on the chargeback rate may require changes to fulfilment evidence or delivery communication, while acting on refund rate may require fixing product expectations or return handling.
Currency conversion can change both outcomes. For illustration only, a S$100 payment converted at 0.74 to a US$ settlement equals US$74. A later refund converted at 0.72 equals US$72, leaving a US$2 movement before fees. Check the settlement currency, conversion rate used for refunds, spread, and whether the provider converts at authorisation or settlement. ORVX reports refund value against revenue and keeps each merchant’s trading currency separate, so a currency movement is not mistaken for product margin.
| Outcome | Check | Measure to act on |
|---|---|---|
| Refund | Returned percentage fee, retained fixed fee, GST and conversion rate | Refund value and realized margin |
| Chargeback | Reversal amount, dispute fee and whether the fee is returned | Chargeback rate and dispute cost |
| Currency conversion | Settlement currency, spread and refund-rate timing | Net amount received in the trading currency |
How to compare payment providers fairly
Compare providers with one fixed test order, not with their headline percentage rates. Use the same order value, Singapore-dollar currency, payment method, and customer location for every calculation. A provider charging a lower percentage may still produce a higher cost if its fixed charge, currency handling or method-specific fee differs.
Keep the commercial assumptions identical too: whether the order value includes GST, whether a refund occurs and what portion of the fee is returned, and when the payout reaches your bank account. If GST applies, use the same treatment throughout; Singapore’s current GST rate is 9% (IRAS). Treat payout period separately from transaction cost: it affects working capital and cash timing, not necessarily the amount deducted from the order.
Record both the dollar fee and the fee as a percentage of the order. Then compare the resulting net payment proceeds and the margin effect using the same product cost, shipping cost and advertising assumption. This gives a fair basis for deciding whether a provider’s documented terms fit your order mix, without ranking providers by a single advertised rate.
| Measure | Hold constant | What it tells you |
|---|---|---|
| Transaction cost | Order value, SGD, payment method | Cash deducted per order |
| Refund outcome | Refund timing and fee reversal assumption | Realised cost when an order is refunded |
| Tax treatment | GST-inclusive or GST-exclusive basis | Comparable revenue and margin inputs |
| Payout period | Days from payment to bank receipt | Working-capital timing |
Sources
- Current GST rates (Inland Revenue Authority of Singapore, 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.