This article explains how Qashier works out the amount paid into your bank account for PayNow and e-wallet sales in Singapore: the transaction fee (MDR) on each sale, the 9% GST charged on Qashier's fees, how each is rounded, and how to check the figures against your Payout Report in QashierHQ.
Applies to
Markets: Singapore only.
Payment methods: PayNow (terminal, Qashier Soundbox and online), GrabPay, Alipay+, ShopeePay, WeChat Pay and other Singapore e-wallets processed by QashierPay.
Access: the Payment Management access right in QashierHQ, to open Payout Report.
The examples below use a 0.40% rate (Soundbox PayNow). Your own rate for each payment method is shown in QashierHQ under Payment Management.
Understanding your payout amount
The amount that reaches your bank account for a day's sales is:
Total Credit Amount = Total Transaction Amount − Total Transaction Fee Amount − Total Fixed Fee Amount − Total Minimum Fee Amount − Total Tax Amount
Two of these lines are worked out in different ways:
The transaction fee (MDR) is calculated on each sale and rounded up per sale.
The tax is 9% GST on Qashier's fees (not on your sales). It is kept exact per sale, added up for the day, and rounded up once.
The MDR (Merchant Discount Rate) fee
The MDR is the processing fee charged on each transaction when a customer pays you. For example, on a $10 sale with a 0.40% MDR rate, the fee is $0.04.
MDR is calculated per transaction, not on your daily total. Two separate $5 sales mean two separate MDR fees, not one combined fee on $10. This matters because of how we handle rounding.
MDR fees are rounded up to the next cent for each transaction. When the calculation produces a fraction of a cent, we round up to the next whole cent. On a $0.50 sale at 0.40%, the raw fee is $0.002. A fraction of a cent cannot be charged, so the fee becomes $0.01.
Worked examples at 0.40% MDR
Example A – sale of $3.00: $3.00 × 0.004 = $0.012. This is more than 1 cent but less than 2 cents, so it rounds up. MDR fee: $0.02.
Example B – sale of $1.00: $1.00 × 0.004 = $0.004. This is less than 1 cent, so it rounds up. MDR fee: $0.01.
Example C – sale of $5.00: $5.00 × 0.004 = $0.02. This is already a whole cent, so no rounding is needed. MDR fee: $0.02.
Rounding only applies when there is a fraction of a cent. If the calculation already lands on a whole cent, the fee stays as it is.
Some payment methods also have a fixed fee per transaction or a minimum fee. These show as separate lines (Total Fixed Fee Amount and Total Minimum Fee Amount) in your payout breakdown.
GST on your fees
Qashier charges 9% GST on its fees. This is tax on the fee, not on your sale. Since 5 Jan 2026, GST is rounded once per daily settlement rather than once per transaction, so very small fees are no longer over-rounded.
Three-step process
Keep exact amounts: for each sale in the day's settlement, we calculate 9% of the fee and keep the full amount, fractions of a cent included.
Add them all up: we sum those exact amounts for the day.
Round once at the end: we round the day's total up to the next cent. This is the Total Tax Amount in your payout breakdown.
Worked example (five sales at 0.40% MDR)
Sale | MDR fee (rounded up per sale) | Exact GST (9% of the fee) |
$3.00 | $0.02 | $0.0018 |
$1.00 | $0.01 | $0.0009 |
$5.00 | $0.02 | $0.0018 |
$25.00 | $0.10 | $0.0090 |
$40.00 | $0.16 | $0.0144 |
Total | $0.31 | $0.0279 → rounded up once to $0.03 |
If GST were rounded up per sale instead, the lines would become $0.01, $0.01, $0.01, $0.01 and $0.02, and you would be charged $0.06. Rounding once per day keeps the total at $0.03.
How to check your payout in QashierHQ
Log in to QashierHQ and open Money & Finance > Payout Report.
Select the store and the payout day, then open the day's breakdown.
At the bottom of the breakdown you will see Total Transaction Amount, Total Transaction Fee Amount, Total Fixed Fee Amount, Total Minimum Fee Amount, Total Tax Amount and Total Credit Amount.
Check that Total Credit Amount = Total Transaction Amount − Total Transaction Fee Amount − Total Fixed Fee Amount − Total Minimum Fee Amount − Total Tax Amount. It should match the amount paid to your bank for that day.
Example: Total Transaction Amount $503.65, Total Transaction Fee Amount $2.04, no fixed or minimum fees, Total Tax Amount $0.19 (9% of $2.04 = $0.1836, rounded up once). Total Credit Amount = $503.65 − $2.04 − $0.19 = $501.42.
The per-transaction Tax Amount and Credit Amount columns are no longer in the transaction export. Use the totals at the bottom of the breakdown instead.
Common questions
Why are MDR and GST calculated differently?
Each transaction is processed and cleared at the point of sale, so the MDR fee is calculated and rounded per transaction. GST is charged on Qashier's fees for each daily settlement, so it is added up for the day and rounded once at the end.
Why doesn't my payout match my sales total exactly?
Your payout = sales − transaction fees − GST on fees, minus any plan or hardware-instalment deductions. If your balance is below the minimum payout amount, it rolls over to the next payout. Deductions appear as debit adjustments in your payout history. See [SG] When Will I Receive My Payouts? Settlement & Payout Schedule and [SG/MY] Understanding Your Payout Report in QashierHQ.
Where can I see my MDR and tax breakdown?
In QashierHQ, open Money & Finance > Payout Report and open a day's breakdown. The totals at the bottom show the transaction amount, fees, tax and the amount credited.
Still doesn't match? WhatsApp +65 8887 7687 or call +65 3129 8269 (9am–9pm, 7 days a week) with the store name and the settlement date. See Contact Qashier Support by Phone, WhatsApp, LINE or Viber.
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Last verified: 25 Sep 2026 · Markets: SG